Describe the structure of a seminiferous tubule.
The production of sperms in the testes takes place in a highly coiled structure called the seminiferous tubules. These tubules are located in the testicular lobules. Each seminiferous tubule is lined by germinal epithelium. It is lined on its inner side by two types of cells namely spermatogonia and sertoli cells respectively. Spermatogonia are male germ cells which produce primary spermatocytes by meiotic divisions. Primary spermatocytes undergo further meiotic division to form secondary spermatocytes and finally, spermatids. Spermatids later metamorphoses into male gametes called spermatozoa. Sertoli cells are known as nurse cells of the testes as they provide nourishment to the germ cells. There are large polygonal cells known as interstitial cells or leydig cells just adjacent to seminiferous tubules. These cells secrete the male hormone called testosterone. (figure)
Choose the correct option
Match the columns.
Column $I$ | Column $II$ |
$(a)$ Seminiferous tubules | $(1)$ Place for storage and maturity of sperm |
$(b)$ Urethra | $(2)$ Structure which releases out sperm cells |
$(c)$ seminal vesicle | $(3)$ A gland exist in pair producing nutrients |
$(d)$ Epididymis | $(4)$ Coiled duct where sperms start development |
If the vas deferens of a man is surgically disconnected
The nutritive medium for the ejaculated sperms is given by
Location - function : Scrotum and Epididymis