what is spermatogenesis process?
Answers
Spermatogenesis is the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis. ... The spermatids are transformed into spermatozoa (sperm) by the process of spermiogenesis. These develop into mature spermatozoa, also known as sperm cells.
Spermatogenesis
Spermatogenesis is the sequence of events in the seminiferous tubules of the testes that produce the male gametes, the sperms.
During development,the primordial germ cells migrate into the testes and become immature germ cells called sperm mother cells or spermatogonia in the inner surfaces of the seminiferous tubules.
The spermatogonia begin to undergo mitotic division at puberty and continue throughout life.
In the first stage of spermatogenesis the spermatogonia migrate among sertoli cells towards the central lumen of the seminiferous tubule and become modified and enlarged to form primary spermatocytes which are diploid with 23 pairs that is 46 chromosomes.
Some of the primary spermatocytes undergo first meiotic division to form two secondary spermatocytes which are haploid with 23 chromosomes each.
The secondary spermatocytes undergoes second meiotic division to produce 4 haploid spermatids.
The spermatids are transformed into mature spermatozoa (sperms) by the process called spermiogenesis.
Sperms are finally released into the cavity of seminiferous tubules by a process called spermiation.
The whole process of spermatogenesis takes about 64 days.
The sperm production remains nearly constant at a rate of about 200 million sperms per day.
Spermatogenesis starts at the age of puberty and it is initiated due to the increase in the release of gonadotropin releasing hormone (GnRH) by the hypothalamus.
