The reproductive system of the male has two major functions:
- Production of sperm
- Delivery of these to the reproductive tract of the female.
Formation of Testis
First 6 weeks after conception, the gonads of males and females are similar in appearance
Testis develop if Primordial germ cells have the SRY gene
Is the sequence of events by which spermatogonia are transformed into spermatozoa.
Is the process by which spermatogonia develop into sperms
It begins at puberty.
Germ cells are present in sex cords of testis
Sex cords acquire lumen & become seminiferous tubules
PMGs give rise to spermatogonial stem cells
PHASES OF SPERMATOGENESIS
- •Spermatogonial Phase (Mitosis)
- •Spermatocyte Phase (Meiosis)
- •Spermatid Phase (Spermiogenesis)
Spermatogonial Phase (Mitosis)
- Type A dark spermatogonia
- Type A pale spermatogonia
- Type B spermatogonia
Spermatocyte Phase (Meiosis)
- Primary spermatocyte
- Secondary spermatocyte
- Formation of acrosome
- Condensation of nucleus
- Formation of neck, middle piece & tail
- Shedding of most of the cytoplasm
- Entire process of spermatogenesis takes approx. 74 days or 2 months Approximately 300 millions sperms are daily produced.
In the epididymis sperms are stored and acquire motility.