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Encyclopedia > Mesonephros
Mesonephros
Reconstruction of a human embryo of 17 mm. (Label for Mesonephros is at center right.)
[[Image:|250px|center|]]
Latin '
Gray's subject #252 1205
System
MeSH A16.254.500
Dorlands/Elsevier {{{DorlandsPre}}}/{{{DorlandsSuf}}}

The mesonephros (Latin for "middle kidney") is one of three excretory organs that develop in vertebrates. It serves as the main excretory organ of aquatic vertebrates and as a temporary kidney in higher vertebrates. The mesonephros is also called the Wolffian body after Caspar Friedrich Wolff who described it in 1759. Embryos (and one tadpole) of the wrinkled frog (Rana rugosa). ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo Elsevier, the worlds largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. ... Latin was the language originally spoken in the region around Rome called Latium. ... Human kidneys viewed from behind with spine removed The kidneys are bean-shaped excretory organs in vertebrates. ... The excretory system is the system of an organisms body that performs the function of excretion, the bodily process of discharging wastes. ... Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... Caspar Friedrich Wolff (January 18, 1734 _ February 22, 1794) was a significant German anatomist. ... 1759 was a common year starting on Monday (see link for calendar). ...


The mesonephros is composed of the mesonephric duct (also called the Wolffian duct), mesonephric tubules, and associated capillary tufts. A single tubule and its associated capillary tuft is called a mesonephric excretory unit; these units are similar in structure and function to nephrons of the adult kidney. The mesonephros is derived from intermediate mesoderm in the vertebrate embryo. The Wolffian duct (also known as archinephric duct, Leydigs duct, and the mesonephric duct) is an organ found in humans during fetal development. ... The Wolffian duct (also known as archinephric duct, Leydigs duct, and the mesonephric duct) is an paired organ found in mammals including humans during embryogenesis. ... Nephron of the kidney A nephron is the basic structural and functional unit of the kidney. ... It has been suggested that organogenesis be merged into this article or section. ...


In human males, the mesonephros gives rise to the efferent ductules of the testis, the epididymis, vas deferens, seminal vesicle, and vestigial structures such as the appendix testis, appendix epididymis, and paradidymis. The mesonephros largely regresses in human females, though vestigial structures such as Gartner's cysts, the epoophoron, and paroophoron are common. Human male anatomy The testicles, known medically as testes (singular testis), are the male generative glands in animals. ... Male Anatomy The epididymis is part of the human male reproductive system and is present in all male mammals. ... Male Anatomy The vas deferens, also called ductus deferens, (Latin: carrying-away vessel) is part of the human male anatomy. ... Male Anatomy The seminal vesicles are a pair of glands on the posterior surface of the urinary bladder of males. ... The epoophoron , also called organ of Rosenmüller, is a remnant of the Wolffian duct that can be found next to the ovary and fallopian tube. ...


See also

Mammalian embryogenesis/Embryology and Fetal development - edit

Embryo: Zygote | Morula | Blastula/Blastomere/Blastosphere | Gastrula/Gastrulation | Fetus | Carnegie stages Mammalian embryogenesis is the process of cell division and cellular differentiation which leads to the development of a mammalian embryo. ... Embryology is the branch of developmental biology that studies embryos and their development. ... Fetal development is the process in which a fetus develops during gestation, from the time of conception until birth. ... Embryos (and one tadpole) of the wrinkled frog (Rana rugosa). ... This article or section does not cite its references or sources. ... Morula is a stage of embryonic development in animals, including the 16-cell phase, the 32-cell phase, and the 64-cell phase. ... Blastulation. ... A blastomere is the structure which results from the divisions of a fertilised egg during embryonic development . ... The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum. ... 1 - blastula, 2 - gastrula; orange - ectoderm, red - endoderm. ... 1 - blastula, 2 - gastrula; orange - ectoderm, red - endoderm. ... Fetus at eight weeks Foetus redirects here. ... In embryology, Carnegie stages are a standardized system of 23 stages used to provide a unified developmental chronology of the embryo. ...


General: Archenteron | Blastopore | Hensen's node | Germ layer (Ectoderm, Endoderm, Mesoderm) | Histogenesis | Organogenesis | Branchial arch (1st) | Meckel's cartilage | Somite/Somitomere | Proctodeum | Rathke's pouch | Thyroglossal duct | Vitelline duct The archenteron is an indentation that forms early on in a developing blastula. ... A blastopore is an opening into the archenteron during the embryonic stages of an organism. ... Hensens Node is the organizer for gastrulation in birds. ... It has been suggested that organogenesis be merged into this article or section. ... The ectoderm is outermost of the three germ layers of the developing embryo, the other two being the mesoderm and the endoderm. ... The endoderm, sometimes refered to as entoderm, is one of the three germ layers of the developing embryo, the other two being the ectoderm and the mesoderm. ... The mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. ... An Introduction to Histogenesis Histogenesis is defined as the formation of tissues and organs from undifferentiated cells (Encarta Dictionary). ... Organogenesis is a stage of animal development where the ectoderm, endoderm, and mesoderm are formed. ... Schematic of developing fetus with first, second and third arches labeled. ... It has been suggested that this article or section be merged into branchial arch. ... The cartilaginous bar of the mandibular arch is formed by what are known as Meckel’s cartilages (right and left) ; above this the incus is developed. ... In the developing vertebrate embryo, somites are masses of mesoderm distributed along the two sides of the neural tube and that will eventually become dermis (dermatome), skeletal muscle (myotome), and vertebrae (sclerotome). ... In the developing vertebrate embryo, the somitomeres are loose masses of paraxial mesoderm derived cells that form along each side of the neural tube towards the end of the third gestational week. ... A proctoduem is the back ectodermal part of an alimentary canal. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... The thyroglossal duct is an embryological anatomical structure which forms the connection between the initial area of development of the thyroid gland and its final position. ...


Circulatory system: Bulbus cordis | Foramen ovale | Ductus venosus | Ductus arteriosus A circulatory system (sometimes cardiovascular system) is an organ system that moves substances to and from cells; it can also help stabilize body temperature and pH (part of homeostasis). ... When the heart assumes its S-shaped form the bulbus cordis lies ventral to and in front of the primitive ventricle. ... In the fetal heart, the foramen ovale allows blood to enter the left atrium from the right atrium. ... In the fetus, the ductus venosus connects the left umbilical vein with the upper inferior vena cava. ... In the developing fetus, the ductus arteriosus (DA) is a shunt connecting the pulmonary artery to the aortic arch that allows much of the blood from the right ventricle to bypass the fetus fluid-filled lungs. ...


Nervous system: Neurula | Neurulation | Neural crest | Notochord | Neuromere | Neural development The nervous system of an animal coordinates the activity of the muscles, monitors the organs, constructs and also stops input from the senses, and initiates actions. ... A Neurula is an embryo at the early stage of development in which neurulation occurs. ... Neurulation is a part of organogenesis in vertebrate embryos. ... The neural crest, a component of the ectoderm, is one of several ridgelike clusters of cells found on either side of the neural tube in vertebrate embryos. ... The notochord is a flexible rod-shaped body found in embryos of all chordates. ... Neuromeres are transient segments during the early development of the human brain. ... The study of neural development draws on both neuroscience and developmental biology to describe the cellular and molecular mechanisms by which complex nervous systems emerge during embryonic development and throughout life. ...


Urinary/Reproductive system: Wolffian duct | Müllerian duct | Mesonephros | Fetal genital development | Urogenital folds | Gubernaculum | Urethral groove | Urogenital sinus | Ureteric bud | Kidney development The urinary system is the organ system that produces, stores, and carries urine. ... A reproductive systems is the ensembles and interactions of organs and or substances within an organism that stricly pertain to reproduction. ... The Wolffian duct (also known as archinephric duct, Leydigs duct, and the mesonephric duct) is an paired organ found in mammals including humans during embryogenesis. ... The Müllerian ducts are paired ducts of the embryo which empty into the cloaca, and which in the female develop into the upper vagina, cervix, uterus and oviducts; in the male they disappear except for the vestigial vagina masculina and the appendix testis. ... This article or section is in need of attention from an expert on the subject. ... The urogenital folds are an embryological structure which give rise to a portion of the external genitalia. ... The gubernaculum is a fold of peritoneum which attaches to the caudal end of the testes. ... The urogenital sinus (also known as the persistent cloaca) is a part of the human body while it is an embryo. ... In humans, the metanephros (adult kidney) begins as an aggregate of mesenchymal cells that are detectable by the fifth gestational week as two small areas in the intermediate mesoderm close to the pelvic aorta. ...


Uterine support: Placenta | Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) | Amniotic sac (Amnion, Chorion) | Yolk sac | Allantois | Trophoblast (Cytotrophoblast | Syncytiotrophoblast | Gestational sac) Female internal reproductive anatomy The uterus or womb is the major female reproductive organ of most mammals, including humans. ... The placenta is an ephemeral (temporary) organ present only in female placental mammals during gestation (pregnancy). ... A newborn at 45 seconds. ... Umbilical arteries carry deoxygenated blood from the fetus to the placenta in the umbilical cord. ... Fetal circulation; the umbilical vein is the large, red vessel at the far left The umbilical vein is a blood vessel present during fetal development that carries oxygenated blood from the placenta to the growing fetus. ... Whartons jelly is a gelatinous substance within the umbilical cord. ... amniotic sac The amniotic sac is a tough but thin transparent pair of membranes, which hold a developing embryo (and later fetus) until shortly before birth. ... The amniotic sac is a tough but thin transparent pair of membranes which holds a developing embryo (and later fetus) until shortly before birth. ... Chorion can refer to the following things: Chorion is the outer membrane of the amniotic sac. ... The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation. ... Allantois is a part of a developing animal embryo. ... The trophoblast (from Greek threphein: to feed) is considered to be the first of all embryonic annexes. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... Syncytiotrophoblasts are cells found in the placenta of human embryos. ... The gestational sac is the only available intrauterine structure that can be used to determine if an intrauterine pregnancy (IUP) exists, until the embryo is identified. ...


  Results from FactBites:
 
XI. Splanchnology. 3. The Urogenital Apparatus. Gray, Henry. 1918. Anatomy of the Human Body. (3757 words)
The permanent organs of the adult are preceded by a set of structures which are purely embryonic, and which with the exception of the ducts disappear almost entirely before the end of fetal life.
The diverticulum from the Wolffian duct grows dorsalward and forward along the posterior abdominal wall, where its blind extremity expands and subsequently divides into several buds, which form the rudiments of the pelvis and calyces of the kidney; by continued growth and subdivision it gives rise to the collecting tubules of the kidney.
One end expands to form a glomerulus, while the rest of the tubule rapidly elongates to form the convoluted and straight tubules, the loops of Henle, and the connecting tubules; these last join and establish communications with the collecting tubules derived from the ultimate ramifications of the diverticulum from the Wolffian duct.
Mesonephros - Wikipedia, the free encyclopedia (262 words)
The mesonephros is derived from intermediate mesoderm in the vertebrate embryo.
In human males, the mesonephros gives rise to the efferent ductules of the testis, the epididymis, vas deferens, seminal vesicle, and vestigial structures such as the appendix testis, appendix epididymis, and paradidymis.
The mesonephros largely regresses in human females, though vestigial structures such as Gartner's cysts, the epoophoron, and paroophoron are common.
  More results at FactBites »

 
 

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