✅ GAMETOGÉNESIS ¿Como se forman las gametas? | EMBRIOLOGÍA 📚
Gametogenesis: The Formation of Male and Female Gametes
Overview of Gametogenesis
- Gametogenesis is the biological process through which male (spermatozoa) and female (oocytes) gametes are formed in the gonads.
- In males, this process is known as spermatogenesis, occurring in the testicles; in females, it is called oogenesis, taking place in the ovaries.
Origin of Gametes
- Both male and female gametes originate from primordial germ cells that appear in the yolk sac during the late third to early fourth week of embryonic development.
- These primordial germ cells migrate through tissues using amoeboid movements until they reach the developing gonads by the end of the fourth and fifth weeks.
Process of Gametogenesis
- Upon reaching the gonads, germ cells undergo several mitotic divisions to increase their cell numbers before entering gametogenesis.
Phases of Gametogenesis
- Multiplication Phase
- Germ cells proliferate through successive mitotic divisions to increase their quantity.
- Growth Phase
- In females, oogonia grow in plasma volume and differentiate into primary oocytes; in males, spermatogonia experience a slight decrease in volume while increasing mitochondrial numbers to become primary spermatocytes.
- Maturation Phase