Mesonephric tubules
Encyclopedia
Mesonephric tubules are genital ridges that are next to the mesonephros
.
In males, some of the mesonephric kidney tubules, instead of being used to filter blood like the rest, they "grow" over to the developing testes, penetrate it, and become connected to the seminiferous tubules
of the testes.
The sperm
differentiate inside the seminiferous tubules, then swim down these tubes, then through these special mesonephric tubules, and go down inside Wolffian duct
, to the coelom
and finally to the organ the animal uses to transport sperm into females.
It gives rise to the epoophoron
, paroöphoron
, and paradidymis
.
Mesonephros
The mesonephros 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 reptiles, birds, and mammals. The mesonephros is included in the Wolffian body after Caspar Friedrich Wolff who described it in 1759...
.
In males, some of the mesonephric kidney tubules, instead of being used to filter blood like the rest, they "grow" over to the developing testes, penetrate it, and become connected to the seminiferous tubules
Seminiferous tubules
Seminiferous tubules are located in the testes, and are the specific location of meiosis, and the subsequent creation of gametes, namely spermatozoa....
of the testes.
The sperm
Spermatozoon
A spermatozoon is a motile sperm cell, or moving form of the haploid cell that is the male gamete. A spermatozoon joins an ovum to form a zygote...
differentiate inside the seminiferous tubules, then swim down these tubes, then through these special mesonephric tubules, and go down inside Wolffian duct
Wolffian duct
The mesonephric duct is a paired organ found in mammals including humans during embryogenesis....
, to the coelom
Coelom
The coelom is a fluid-filled cavity formed within the mesoderm. Coeloms developed in triploblasts but were subsequently lost in several lineages. Loss of coelom is correlated with reduction in body size...
and finally to the organ the animal uses to transport sperm into females.
It gives rise to the epoophoron
Epoophoron
The epoophoron or epoöphoron is a remnant of the Mesonephric duct that can be found next to the ovary and fallopian tube.-Anatomy:...
, paroöphoron
Paroöphoron
The paroöphoron consists of a few scattered rudimentary tubules, best seen in the child, situated in the broad ligament between the epoöphoron and the uterus. Named for the Welsh anatomist David Johnson who originally described the structure at the University of Wales, Aberystwyth.It is a remnant...
, and paradidymis
Paradidymis
The term paradidymis is applied to a small collection of convoluted tubules, situated in front of the lower part of the spermatic cord, above the head of the epididymis....
.
External links
- http://www.uoguelph.ca/zoology/devobio/210labs/kidney2.html