• Spermatogonium undergoes 5-7 cycles of division to form primary spermatocyte
• So one spermatogonium forms 64-512 spermatozoa.

I primary spermatocyte ➡️ 4 spermatid

---

---

Difference between spermatogenesis and oogenesis

Spermatogenesis	Oogenesis
process starts only after puberty	process begins in intrauterine life
polar body absent	polar body present
i primary spermatocyte ➡️ 4 spermatid	i primary oocyte ➡️ only one ovum

• Spermatogenesis completed in 74 days > 64 days > 60 days

Most fertile period in woman : “3 days” [ 2 days before ovulation + 1 day after ovulation ] because sperms are viable for 48 hours and secondary oocyte in the metaphase arrest waits for only 24 hours.

• Lh surge occurs 36 hours before ovulation
• Lh peck : 12 hours before ovulation > at ovulation
• In males spermatogenesis takes place in spminiferous tubules
• Maturation of sperms occurs in epididymis
• Capacitation of sperms occurs in female genital tract for 7 hours

---

---