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Seminiferous tubules are located within the testicles, and are the specific location of meiosis, and the subsequent creation of male gametes, namely spermatozoa.
However, most fish do not possess seminiferous tubules. Instead, the sperm are produced in spherical structures called sperm ampullae. These are seasonal structures, releasing their contents during the breeding season, and then being reabsorbed by the body. Before the next breeding season, new sperm ampullae begin to form and ripen.
However, most fish do not possess seminiferous tubules. Instead, the sperm are produced in spherical structures called sperm ampullae. These are seasonal structures, releasing their contents during the breeding season and then being reabsorbed by the body. Before the next breeding season, new sperm ampullae begin to form and ripen.
Cross-section of a seminiferous tubule of the testis of a rat (250x) The function of Sertoli cells in the Amniota and Anamniota is the same, but they have slightly different properties when compared to each other. Anamnionts (fish and amphibians) employ cystic spermatogenesis in order to produce sperm cells. [22]
In cartilaginous fish and amphibians, sperm are carried through the archinephric duct, which also partially helps to transport urine from the kidneys. In teleosts , there is a distinct sperm duct, separate from the ureters , and often called the vas deferens, although probably not truly homologous with that in humans. [ 21 ]
It is located in the walls of the seminiferous tubules and supplies nutrients to sperm. [5] They are responsible for the differentiation of spermatids, the maintenance of the blood-testis barrier, and the secretion of inhibin, androgen-binding protein and Müllerian-inhibiting factor. [citation needed]
Sperm cells form during the process known as spermatogenesis, which in amniotes (reptiles and mammals) takes place in the seminiferous tubules of the testicles. [3] This process involves the production of several successive sperm cell precursors, starting with spermatogonia , which differentiate into spermatocytes .
The mature spermatozoa are released from the protective Sertoli cells into the lumen of the seminiferous tubule and a process called spermiation then takes place, which removes the remaining unnecessary cytoplasm and organelles. [3] The resulting spermatozoa are now mature but lack motility, rendering them sterile.
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