Information about Wolffian Ducts
| Urogenital sinus of female human embryo of eight and a half to nine weeks old. | ||
) | ||
| Transverse section of a chick embryo of forty-five hours’ incubation. | ||
| Latin | d. mesonephricus, d. Wolffi | |
| subject #252 1205 | ||
| Carnegie stage | 11 | |
| Precursor | intermediate mesoderm | |
| Gives rise to | ureteric bud | |
| Dorlands/Elsevier | d_29/12314957 | |
It connects the primitive kidney Wolffian body (or mesonephros) to the cloaca and serves as the anlage for certain male reproductive organs.
Development
In both the male and the female the Wolffian duct develops in to the trigone of urinary bladder, a part of the bladder wall. However, further development differentiates between the sexes in the development of the urinary and reproductive organs.Male development
In a male, it develops into a system of connected organs between the testis and the prostate, namely the rete testis, the efferent ducts, the epididymis, the vas deferens, the seminal vesicle, and the prostate.For this it is critical that the ducts are exposed to testosterone during embryogenesis. Testosterone binds to and activates androgen receptor, affecting intracellular signals and modifying the expression of numerous genes (Hannema et al., 2006).
In the mature male, the function of this system is to store and mature sperm, and provide accessory semen fluid.
Female development
In the female, in the absence of testosterone support, the Wolffian ducts develop and wither.As a residual the epoophoron and Skene's glands may be present. Also, lateral to the wall of the vagina a Gartner's duct or cyst could develop as a remnant.
History
It is named after Caspar Friedrich Wolff who described the mesonephros and its ducts in his dissertation in 1759.[1]Additional images
) Diagram of a transverse section, showing the mode of formation of the amnion in the chick. | Reconstruction of a human embryo of 17 mm. | Broad ligament of adult, showing epoöphoron. | Transverse section of human embryo eight and a half to nine weeks old. |
) Tail end of human embryo twenty-five to twenty-nine days old. | ) Tail end of human embryo thirty-two to thirty-three days old. | ) Tail end of human embryo; from eight and a half to nine weeks old. | Primitive kidney and bladder, from a reconstruction. |
See also
- Fetal genitalia
- List of homologues of the human reproductive system
- Masculinization
- Sexual differentiation
- Müllerian duct
References
Hannema SE, Print CG, Charnock-Jones DS, Coleman N, Hughes IA. Changes in gene expression during Wolffian duct development. Horm Res. 2006;65(4):200-9.External links
The urogenital sinus (also known as the persistent cloaca) is a part of the human body only present in the development of the urinary and reproductive organs. It is the ventral part of the cloaca, formed after the cloaca separates from the rectum.
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Latin}}}
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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In embryology, Carnegie stages are a standardized system of 23 stages used to provide a unified developmental chronology of the vertebrate embryo.
The stages are delineated through the development of structures, not by size or the number of days of development, and so the
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The stages are delineated through the development of structures, not by size or the number of days of development, and so the
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Embryology is the study of the development of an embryo. An embryo is defined as any vertebrate in a stage before birth or hatching. Embryology refers to the development of the egg cell (zygote) after fertilization and the differentiation of cells into tissues and organs.
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Intermediate mesoderm is a type of mesoderm that is located between the paraxial mesoderm and the lateral plate.
It develops into the part of the urogenital system (kidneys and gonads)
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It develops into the part of the urogenital system (kidneys and gonads)
- forms of urogenital system
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The ureteric bud is a protrusion from the mesonephric duct during the development of the urinary and reproductive organs. It latter develops into the adult kidney, except for the nephrons, which, in contrast, originate from the metanephric blastema.
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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organ (Latin: organum, "instrument, tool") is a group of tissues that perform a specific function or group of functions. Usually there is a main tissue and sporadic tissues. The main tissue is the one that is unique for the specific organ.
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Embryogenesis is the process by which the embryo is formed and develops. It starts with the fertilization of the ovum, egg, which, after fertilization, is then called a zygote.
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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.
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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.
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cloaca is the posterior opening that serves as the only such opening for the intestinal, urinary, and (usually) genital tracts of certain animal species. The word comes from Latin, and means "sewer".
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Anlage is a fundamental principle, or a foundation for future development. The word is of and relates to the verb anlegen which means establishing something or preparing something for development (e.g.
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A sex organ, or primary sexual characteristic, as narrowly defined, is any of those anatomical parts of the body which are involved in sexual reproduction and constitute the reproductive system in a complex organism; namely:
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The trigone is a smooth triangular region of the internal urinary bladder formed by the two ureteral orifices and the internal urethral orifice.
The area is very sensitive to expansion and once stretched to a certain degree, the urinary bladder signals the brain of its need
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The area is very sensitive to expansion and once stretched to a certain degree, the urinary bladder signals the brain of its need
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The development of the urinary and reproductive organs is a part of the prenatal development, and concerns the urinary system and sex organs. The latter is a part of the stages of sexual differentiation.
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Male (♂) refers to the sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilisation.
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The testicle (from Latin testis, meaning "witness",[1] plural testes) or ballock is the male generative gland in animals. This article will concentrate on mammalian testicles unless otherwise noted.
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Rete testis is an anastomosing network of delicate tubules located in the hilum of the testicle (mediastinum testis) that carries sperm from the seminiferous tubules to the vasa efferentia.
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The efferent ducts (or efferent ductules) are part of the testis, connecting the rete testis with the head of the epididymis. 12 to 20 in number, their function is primarily as conduits of sperm. They are lined by columnar, mostly ciliated epithelium.
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The epididymis is part of the human male reproductive system and is present in all male mammals. It is a narrow, tightly-coiled tube connecting the efferent ducts from the rear of each testicle to its vas deferens.
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The vas deferens (plural: vasa deferentia), also called ductus deferens, (Latin: "carrying-away vessel") is part of the male anatomy of some species, including humans.
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The seminal vesicles are a pair of simple tubular glands posteroinferior to the urinary bladder of males.
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Anatomy
They are approximately 5 cm in length, though the full length of the gland is approximately 10 cm and curled up inside of the structure...... Click the link for more information.
The prostate is a compound tubuloalveolar exocrine gland of the male mammalian reproductive system.
The prostate differs considerably among species anatomically, chemically, and physiologically.
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The prostate differs considerably among species anatomically, chemically, and physiologically.
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Testosterone is a steroid hormone from the androgen group. Testosterone is primarily secreted in the testes of males and the ovaries of females, although small amounts are also secreted by the adrenal glands. It is the principal male sex hormone and an anabolic steroid.
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Embryogenesis is the process by which the embryo is formed and develops. It starts with the fertilization of the ovum, egg, which, after fertilization, is then called a zygote.
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Testosterone is a steroid hormone from the androgen group. Testosterone is primarily secreted in the testes of males and the ovaries of females, although small amounts are also secreted by the adrenal glands. It is the principal male sex hormone and an anabolic steroid.
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The androgen receptor (AR) is a type of nuclear receptor which is activated by binding of either of the androgenic hormones testosterone or dihydrotestosterone.[1]
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