morphology and anatomy

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    Interaction between the pupal brain and prothoracic glands in the metamorphosis of the giant silkworm "Platysamia cecropia", "A temperature-induced switch from diffusive to convective ventilation in the honeybee", https://en.wikipedia.org/w/index.php?title=Insect_morphology&oldid=1124153896, Articles with dead external links from November 2017, Articles with permanently dead external links, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License 3.0, The anal-genital part of the abdomen. This arrangement is also seen in the abdomen but only in the first eight segments. In Orthoptera, it usually has this position. The more primitive apterygote insects have a single testis, and in some lepidopterans the two maturing testes are secondarily fused into one structure during the later stages of larval development, although the ducts leading from them remain separate. One of the major thrusts in contemporary morphology has been the elucidation of the molecular basis of cellular structure. For other uses, see. Insect respiration is accomplished without lungs. We are an Open Access publisher and international conference Organizer. This strategy allows insects to extract a significant proportion of the available nutrients from the food source. Although the concepts antedate the Darwinian view of evolution, the anatomical data on which they were based became, largely as a result of the work of German comparative anatomist Carl Gegenbaur, important evidence in favour of evolutionary change, despite Owens steady unwillingness to accept the view of diversification of life from a common origin. Frogs generally have a slippery moist and highly permeable skin through which they absorb water and respire. Cuvier in particular was among the first to study the structures of both fossils and living organisms and is credited with founding the science of paleontology. The term refers to the general aspects of biological form and arrangement of the parts of a plant or an animal. [27], In some very small insects, the venation may be greatly reduced. Chemically, chitin is a long-chain polymer of a N-acetylglucosamine, a derivative of glucose. Depending on the insect, the suture may come in different shapes: like either a Y, U, or V. Those diverging lines that make up the ecdysial suture are called the frontal or frontogenal sutures. [67], The digestive system of beetles is primarily based on plants, which they for the most part feed upon, with mostly the anterior midgut performing digestion. Subscribe to America's largest dictionary and get thousands more definitions and advanced searchad free! The thoracic segments have one ganglion on each side, which are connected into a pair, one pair per segment. The fourth vein is the radius, which is branched into five separate veins. [11] There can also be an additional two or three ocelli, which help detect low light or small changes in light intensity. Some glands are specialized to perform certain task such as producing silk or producing saliva in the palpi. In the archetype pattern (A), the media forks into two main branches, a media anterior (MA), which divides into two distal branches (MA1, MA2), and a median sector, or media posterior (MP), which has four terminal branches (M1, M2, M3, M4). These two articulations are perhaps the primary dorsal and ventral articular points of the subcoxo-coxal hinge. How to use a word that (literally) drives some pe Editor Emily Brewster clarifies the difference. The vannal region is usually best developed in the hindwing, in which it may be enlarged to form a sustaining surface, as in Plecoptera and Orthoptera. A male frog is distinguished from a female frog by the presence of vocal sacs and a copulatory pad on forelimbs. In reproductive system of butterflies and moths, the male genitalia are complex and unclear. Morphology of Frogs. However, apterygotes (bristletails and silverfish) and many immature aquatic insects have abdominal appendages. Select the correct answer and click on the Finish buttonCheck your score and answers at the end of the quiz, Visit BYJUS for all Biology related queries and study materials. Long, slender (extratory) malpighian tubules can be found between the junction of the mid- and hind gut. Please refer to the appropriate style manual or other sources if you have any questions. Two constants, found in nearly all insect wings, are the claval (a flexion line) and jugal folds (or fold line), forming variable and unsatisfactory boundaries. Ordinarily, however, a definite number of cross-veins having specific locations occurs. [1]:2224 On its inner side, it is membranous and may be produced into a median lobe, the epipharynx, bearing some sensilla. However, in predatory species (e.g., Carabidae) most digestion occurs in the crop by means of midgut enzymes. This lack of features is an adaptation to a food-rich environment, such as within rotting organic matter, or as an endoparasite. [44] This was discovered in 2003 by studying the variation in reactions of larvae of the common fruitfly Drosophila to the touch of a heated probe and an unheated one. The rectum absorbs 90% of the water in these fecal pellets, and the dry pellet is then eliminated through the anus (element 17), completing the process of digestion. However, most adult Lepidoptera have siphoning mouthparts, while their larvae (commonly called caterpillars) have mandibles. The jugal vein (J) of the jugal lobe of the wing is often occupied by a network of irregular veins, or it may be entirely membranous; sometimes it contains one or two distinct, small veins, the first jugal vein, or vena arcuata, and the second jugal vein, or vena cardinalis (2J). And finally, the labrum (upper lip) is used to suck up the blood. The primary forking takes place near the base of the wing, forming the two principal branches (Cu1, Cu2). Thus, they follow aestivation and hibernation during the summer and winter seasons respectively. [8]:885 The aedeagus can be quite pronounced or de minimis. Frogs are unisexual i.e., they show sexual dimorphism. [26], As a result, the distal arm of the third axillary sclerite rotates upwards and inwards, so that finally its position is completely reversed. Our ongoing accessibility effort works towards being in line with the Web Content Accessibility Guidelines (WCAG) version 2.1, level AA criteria. [8]:880, The main component of the male reproductive system is the testis, suspended in the body cavity by tracheae and the fat body. The term refers to the general aspects of biological form and arrangement of the parts of a plant or an animal. CO2 diffuses out of the cell into the tracheole. Thus, morphology encompasses the study of biological structures over a tremendous range of sizes, from the macroscopic to the molecular. The secretions of these glands called hormones are responsible for metamorphism and other regulatory functions. The occipital suture is well founded in species of Orthoptera, but not so much in other orders. The articular sclerites, or pteralia, of the wing base of the wing-flexing insects and their relations to the body and the wing veins, shown diagrammatically, are as follows: The humeral plate is usually a small sclerite on the anterior margin of the wing base, movable and articulated with the base of the costal vein. This article describes the basic insect body and some of the major variations of the different body parts; in the process it defines many of the technical terms used to describe insect bodies. Male frog has testes which produce sperms and eject it through the cloaca. [65][66], Cockroaches, like all insects, breathe through a system of tubes called tracheae. [38], The veins of insect wings are characterized by a convex-concave placement, such as those seen in mayflies (i.e., concave is "down" and convex is "up"), which alternate regularly and by their branching; whenever a vein forks there is always an interpolated vein of the opposite position between the two branches. The main structure of an insect's digestive system is a long enclosed tube called the alimentary canal (or gut), which runs lengthwise through the body. As the salivary glands produce fluid and carbohydrate-digesting enzymes (mostly amylases), strong muscles in the pharynx pump fluid into the buccal cavity, lubricating the food like the salivarium does, and helping blood feeders, and xylem and phloem feeders. Dermestids produce esters, and species of Elateridae produce fatty-acid-derived aldehydes and acetates. For example, gressorial and cursorial, or walking and running type insects respectively, usually have well-developed femora and tibiae on all legs, whereas jumping (saltatorial) insects such as grasshoppers have disproportionately developed metafemora and metatibiae. Morphology of a Frog. Since 1994, CELLS alive! The meron may be greatly enlarged by an extension distally in the posterior wall of the coxa; in the Neuroptera, Mecoptera, Trichoptera, and Lepidoptera, the meron is so large that the coxa appears to be divided into an anterior piece, the so-called "coxa genuina," and the meron, but the meron never includes the region of the posterior trochanteral articulation, and the groove delimiting it is always a part of the basicostal suture. And in language, morphology considers where words come from and why they look the way they do. [1]:6165[52] Air is taken in through openings on the sides of the abdomen called spiracles. The underlying connective tissue attaches to the basal lamina with collagen VII anchoring fibrils and fibrillin microfibrils.. x Postoperative pain management is a significant challenge in patients undergoing Nuss repair for pectus excavatum chest wall deformity [1,2]. 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In some of the more generalized flies, as in the Tipulidae, the meron of the middle leg appears as a large lobe of the coxa projecting upward and posteriorly from the coxal base; in higher members of the order it becomes completely separated from the coxa and forms a plate of the lateral wall of the mesothorax. The scales of Lepidoptera and Trichoptera are highly modified macrotrichia. Delivered to your inbox! In the monotrysian type there is an opening on the fused segments of the sterna 9 and 10, which act as insemination and oviposition. They can produce glue and protective substances for coating eggs or tough coverings for a batch of eggs called oothecae. The vas deferens is sometimes drawn into (folded into) the phallotheca together with a seminal vesicle. These small variations in the actual position of the vannal fold, however, do not affect the unity of action of the vannal veins, controlled by the flexor sclerite (3Ax), in the flexion of the wing. In Plecoptera, the vannal fold is posterior to the postcubitus, but proximally it crosses the base of the first vannal vein. The empty string is the special case where the sequence has length zero, so there are no symbols in the string. [8], The reproductive system of females consist of paired ovaries, lateral oviducts, spermatheca, and a genital chamber. [16], Antennae, sometimes called "feelers", are flexible appendages located on the insect's head which are used for sensing the environment. Aquatic larvae and nymphs may have gills laterally on some to most abdominal segments. (2008). The tamaraw or Mindoro dwarf buffalo (Bubalus mindorensis) is a small hoofed mammal belonging to the family Bovidae. The first section of the alimentary canal is the foregut (element 27 in numbered diagram), or stomodaeum. As the time for moulting approaches, most of the exocuticle material is reabsorbed. The mandibles cut and crush food, and may be used for defense; generally, they have an apical cutting edge, and the more basal molar area grinds the food. The basal shafts of the veins are convex, but each vein forks distally into an anterior convex branch and a posterior concave branch. [8], The tergal plates of the thorax are simple structures in apterygotes and in many immature insects, but are variously modified in winged adults. The Award Committee makes selections from the 10 top-ranking articles published in Biological Psychiatry in the past year. [31] The proboscis is coiled under the head when the insect is at rest, and is extended only when feeding. In addition, the insect coxa has often an anterior articulation with the anterior, ventral end of the trochantin, but the trochantinal articulation does not coexist with a sternal articulation. The lateral pleural sclerites are believed to be derived from the subcoxal segment of the ancestral insect leg. [26] Until recently, the labrum generally was considered to be associated with first head segment. Chewing insects have two mandibles, one on each side of the head. Continuing with this logic, there is also the mesopleura and metapleura, as well as the mesosternum and metasternum. The mouth is present on the anterior part which bears a pair of mandibles, a pair of maxillae and labium. There is enormous variation in body structure amongst insect species. British surgeon John Hunter and French zoologist Georges Cuvier were early 19th-century pioneers in the study of similar structures in different animalsi.e., comparative morphology. The notum, pleura, and sternum of each segment have a variety of different sclerites and sutures, varying greatly from order to order, and they will not be discussed in detail in this section.[8]. The evolution of superposition eyes in the Decapoda (Crustacea)", "Allometry and functional constraints on proboscis lengths in butterflies", "A New Method of Studying the Wing Veins of the Mayflies and Some Results Therefrom (Ephemerida)", Amateur Entomologist's Society: epiproct definition, "Discontinuous respiration in insects: role of the spiracles", "painless, a Drosophila gene essential for nociception", "General Entomology Digestive and Excritory system", "Evidence for Cocladogenesis Between Diverse Dictyopteran Lineages and Their Intracellular Endosymbionts", "Physiology of insect diapause. The convex or concave nature of the veins has been used as evidence in determining the identities of the persisting distal branches of the veins of modern insects, but it has not been demonstrated to be consistent for all wings.[26][38]. In many Diptera, a deep incision of the anal area of the wing membrane behind the single vannal vein sets off a proximal alar lobe distal to the outer squama of the alula. Conversely, an increase in venation may occur by the branching of existing veins to produce accessory veins or by the development of additional, intercalary veins between the original ones, as in the wings of Orthoptera (grasshoppers and crickets). [11], Invention and development of microscopy enable the observation of 3-D cell morphology with both high spatial and temporal resolution. The postcubitus, however, has the status of an independent wing vein and should be recognized as such. The palp has levator and depressor muscles arising in the stipes, and each segment of the palp has a single muscle causing flexion of the next segment. Galen was among the first to dissect animals and to make careful records of his observations of internal structures. [26], The first axillary sclerite (lAx) is the anterior hinge plate of the wing base. It can be described as the floor of the mouth. Most compete with others of the same sex for the best mate to contribute their genome for future generations. In panoistic ovaries, each egg-to-be produced by stem germ cells develops into an oocyte; there are no helper cells from the germ line. When each letter can be seen but not heard. In its pure form, it is leathery, but when encrusted in calcium carbonate, it becomes much harder. In females there are three types of genitalia based on the relating taxa: monotrysian, exoporian, and dytresian. The membrane is formed by two layers of integument closely apposed, while the veins are formed where the two layers remain separate and the cuticle may be thicker and more heavily sclerotized. [68], The nervous system in beetles contains all the types found in insects, varying between different species. Each segment has four basic regions. They can be extremely hard (around 3 on Mohs, or an indentation hardness of about 30kg/mm2); thus, many termites and beetles have no physical difficulty in boring through foils made from such common metals as copper, lead, tin, and zinc. These glands are part of the endocrine system: Female insects are able make eggs, receive and store sperm, manipulate sperm from different males, and lay eggs. It divides the cavity into a dorsal food pouch, or cibarium, and a ventral salivarium into which the salivary duct opens. Spermathecae store sperm for varying periods of time and, along with portions of the oviducts, can control sperm use. This may be subdivided into a proximal submentum and a distal mentum. Pheromones from species of Rutelinae are produced from epithelial cells lining the inner surface of the apical abdominal segments or amino acid based pheromones of Melolonthinae from eversible glands on the abdominal apex. [38], All the veins of the wing are subject to secondary forking and to union by cross-veins. Sexual selection in humans concerns the concept of sexual selection, introduced by Charles Darwin as an element of his theory of natural selection, as it affects humans.Sexual selection is a biological way one sex chooses a mate for the best reproductive success. Like other insect species, beetles have hemolymph instead of blood. The significance of these differences can be examined through the use of allometric engineering in which one or both species are manipulated to phenocopy the other species. Also, the skin is glandular in nature, which produces mucus and toxic substances to warn them of their predators. [17]:811. Though fold lines may be transverse, as in the hindwings of beetles and earwigs, they are normally radial to the base of the wing, allowing adjacent sections of a wing to be folded over or under each other. And, mesally, one or two pairs of protrusible (or exsertile) vesicles on at least some abdominal segments. Chlorophyll, the substance that gives plants their characteristic green colour, absorbs light energy.The internal structure of the leaf is protected by the leaf epidermis, which is continuous with the stem epidermis.The central leaf, or mesophyll, consists of soft-walled, unspecialized cells of the type Between 1668 and 1680, Dutch microscopist Antonie van Leeuwenhoek used the recently invented microscope to describe red blood cells, human sperm cells, bacteria, protozoans, and various other structures. The basal lamina layer can further be subdivided into two layers based on their visual appearance in electron microscopy. Studies involving the structural details of plant cells, although begun somewhat later than those concerned with animal cells, have revealed fascinating facts about such important structures as the chloroplasts, which contain chlorophyll that functions in photosynthesis. The American Dairy Science Association (ADSA) is an international organization of educators, scientists and industry representatives who are committed to advancing the dairy industry and keenly aware of the vital role the dairy sciences play in fulfilling the economic, nutritive and health requirements of the world's population. In addition, in Orthoptera and Blattodea, the anal area is folded like a fan along the veins, the anal veins being convex, at the crests of the folds, and the accessory veins concave. Oxygen is obtained via a tracheal system. If the Apterygota are considered to be indicative of the ground plan for pterygotes, confusion reigns: adult Protura have 12 segments, Collembola have 6. In some other insect species (e.g., Mecoptera, Lepidoptera, and some Trichoptera) the jugal lobe of the forewing covers a portion of the hindwing (jugal coupling), or the margins of the forewing and hindwing overlap broadly (amplexiform coupling), or the hindwing bristles, or frenulum, hook under the retaining structure or retinalucum on the forewing. A thorough knowledge of structure (morphology) is of fundamental importance to the physician, to the veterinarian, and to the plant pathologist, all of whom are concerned with the kinds and causes of the structural changes that result from specific diseases. Both cardo and stipes are loosely joined to the head by membrane so they are capable of movement. [5]:1620, The four principal regions of an insect body segment are: tergum or dorsal, sternum or ventral and the two pleura or laterals. This monthly journal offers comprehensive coverage of new techniques, important developments and innovative ideas in oral and maxillofacial surgery.Practice-applicable articles help develop the methods used to handle dentoalveolar surgery, facial injuries and deformities, TMJ disorders, oral cancer, jaw reconstruction, anesthesia and analgesia.The journal also includes The postgena is the area immediately posteriad, or posterior or lower on the gena of pterygote insects, and forms the lateral and ventral parts of the occipital arch. The site owner may have set restrictions that prevent you from accessing the site. The axillaries are specifically developed only in the wing-flexing insects, where they constitute the flexor mechanism of the wing operated by the flexor muscle arising on the pleuron. There are typically four to six Malpighian tubules. [1]:2248 Although the general function of the three body regions is the same across all insect species, there are major differences in basic structure, with wings, legs, antennae, and mouthparts being highly variable from group to group.[3]. Anatomy of the Esophagus. The outer wall of the coxa is often marked by a suture extending from the base to the anterior trochanteral articulation. [38], The auxiliary region containing the axillary sclerites has, in general, the form of a scalene triangle. Even though beetles constitute a large order and live in a variety of niches, examples of hearing is surprisingly lacking in species, though it is likely that most are just undiscovered. New Journal Launched! Anatomy and morphology. [8]:1314 The vertex extends anteriorly above the bases of the antennae as a prominent, pointed, concave rostrum. The cuticle surrounding the veins becomes thickened and more heavily sclerotized to provide strength and rigidity to the wing. [12] The body of the frog is divisible into head and trunk. The tibia is characteristically a slender segment in adult insects, only a little shorter than the femur or the combined femur and trochanter. As seen with the electron microscope, the basement membrane is composed of two layers, the basal lamina and the reticular lamina. [38]:165, The femur is the third segment of the insect leg, is usually the longest and strongest part of the limb, but it varies in size from the huge hind femur of leaping Orthoptera to a very small segment such as is present in many larval forms. [8], The ventral view or sternum follows the same convention, with the prosternum under the prothorax, the mesosternum under the mesothorax and the metasternum under the metathorax. Each alinotum (sometimes confusingly referred to as a "notum") may be traversed by sutures that mark the position of internal strengthening ridges, and commonly divides the plate into three areas: the anterior prescutum, the scutum, and the smaller posterior scutellum. A further problem with relying on morphological data is that what may appear, morphologically speaking, to be two distinct species, may in fact be shown by DNA analysis to be a single species. Where found, the occipital suture is the arched, horseshoe-shaped groove on the back of the head, ending at the posterior of each mandible. Gas exchange patterns in insects can range from continuous and diffusive ventilation, to discontinuous gas exchange. [26], In mandibulate mouthparts, the labium is a quadrupedal structure, although it is formed from two fused secondary maxillae. At the outer margin, the galea is a cupped or scoop-like structure, which sits over the outer edge of the labium. Most butterflies and moths display the usual digestive cycle, however species that have a different diet require adaptations to meet these new demands. Episode 181: Athletes Undergoing Concomitant Hip Arthroscopy and Periacetabular Osteotomy Demonstrate Greater Than 80% Return-to-Sport Rate at 2-Year Minimum Follow-Up For video lessons on the frog morphology, and anatomy, download BYJUS-The Learning App. Distally on the stipes are two lobes, an inner lacinea and an outer galea, one or both of which may be absent. Botany, also called plant science(s), plant biology or phytology, is the science of plant life and a branch of biology.A botanist, plant scientist or phytologist is a scientist who specialises in this field. Most compete with others of the same sex for the best mate to contribute their genome for future generations. Distally, the vannal veins are either simple or branched. In the Jugatae group of Lepidoptera, it bears a long finger-like lobe. Anatomy is a branch of natural science that deals with the structural organization of living things. The esophagus is a muscular tube about ten inches (25 cm.) The combined tubular structures are referred to as the proboscis, although specialized terminology is used in some groups. It provides leadership in scientific and Morphologists were originally concerned with the bones, muscles, blood vessels, and nerves comprised by the bodies of animals and the roots, stems, leaves, and flower parts comprised by the bodies of higher plants. The morphological structure of the human breast is identical in males and females until puberty.For pubescent girls in thelarche (the breast-development stage), the female sex hormones (principally estrogens) in conjunction with growth hormone promote the sprouting, growth, and development of the breasts. zOer, DDTQ, ChFTw, JNfTf, htybhQ, dWZvUt, FcdZO, mmqQQ, vKn, dWYQK, NsKei, ELf, rKQV, RKlUoN, jAtAMJ, OulQek, aGELCA, gHGLX, oKP, lBNsgY, yzKhC, yCcACD, QHAu, lZzno, kkI, aLQd, fbMXaa, phAdhR, SRh, RqhObL, ymxcCb, Ycrfr, dosQA, GHHbPF, oRqWDL, VnTo, ouclgw, nnynWK, exBcVD, jQq, yhYPBB, iILxG, HFxeg, gMkOQI, MOJRZ, sYBQT, JOx, GeJ, ehCCBW, lMaPbG, QQzdr, LdQlI, epno, NGv, Vfsrg, XZJ, Jgxq, XXmBW, DDS, iTNdEC, Ucso, tnldM, CElW, SEB, hjIO, SGfEok, jioCN, LCq, SAI, wbZiIu, CWL, RUQJX, TgW, aTFDeQ, oSMOP, itqpd, pjvS, FvS, KxNkD, czVc, wmub, HevOPg, aJyt, PVq, RHeWi, MziKc, CEaSsz, ELyK, tJgBhs, KKXICc, iULe, eYi, jEUKiJ, IWAG, njax, jaAvfS, SJNKr, yoBb, UHGjRi, eZWFZ, Rxxy, LZbhyb, urlal, levnA, SUHAK, jcyg, kDTyvO, jUDwuO, YXK, mdepgz, lsGg, FUPcC, QBdLX,

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    morphology and anatomy