Spermatogenesis

The reproductive system of the male has two major functions:

1. Production of sperm
2. 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

SPERMATOGENESIS

— Is the sequence of events by which spermatogonia are transformed into spermatozoa.

Or

—Is the process by which spermatogonia develop into sperms

—It begins at puberty.

At Birth

—Germ cells are present in sex cords of testis

Puberty

—Sex cords acquire lumen & become seminiferous tubules —

PMGs give rise to spermatogonial stem cells

PHASES OF SPERMATOGENESIS

1. •Spermatogonial Phase (Mitosis)
2. •Spermatocyte Phase (Meiosis)
3. •Spermatid Phase (Spermiogenesis)

Spermatogonial Phase (Mitosis)

1. Type A dark spermatogonia
2. Type A pale spermatogonia
3. Type B spermatogonia

Spermatocyte Phase (Meiosis)

1. Primary spermatocyte
2. Secondary spermatocyte

SPERMIOGENESIS

1. Formation of acrosome
2. Condensation of nucleus
3. Formation of neck, middle piece & tail
4. Shedding of most of the cytoplasm

• Entire process of spermatogenesis takes approx. 74 days or 2 months Approximately 300 millions sperms are daily produced.

Sertoli cells

•Support

•Protect

•Nutrition

•Phagocytosis

•Regulate spermatogenesis

In the epididymis sperms are stored and acquire motility.

Want a clearer concept, also see

Oogenesis and Ovarian Cycle