2. The process whereby haploid gametes (reproductive sex
cells) are created
Spermatogenesis in males
Oogenesis in females
Gametogenesis
3. Begins at puberty
Proliferation of stem and progenitor cells called
spermatogonia
Dark ovoid nuclei
Act as stem cell and divide to form new stem cells
Spermatogenesis
4. 1. Type A spermatogonia: clonal divisions and interconnected as
a syncytium
2. Type B spermatogonia: spherical and pale nuclei
3. Each type B produce two cells called primary spermatocytes
4. First meiotic division:produce smaller cells called secondary
spermatocyte
5. Secondary spermatocyte separates the chromatids;produce
two haploid cells called spermatids
6. Spermatids undergo morphological
differentiation;spermatozoa
Summary of Spermatogenesis
ABPSSS
7. Cell differentiation in which spermatids become sperm
Flattening of nucleus
Formation of acrosome
Growth of tail
Reorganization of mitochondria
Shedding of unnecessary cytoplasm
Spermiogenesis
8. Proacrosomal vesicles coalesce as a single acrosomal cap
Centrioles migrate and act as basal body
Golgi Phase
9. Acrosomal cap spreads over half of the nucleus
Contain acrosin
Cap phase
10. Head remains embedded in the sertoli cell
Growing axoneme extends to the tubule
Nuclei become elongated and condensed
Mitochondria migrate through actin filaments called
manchette to form the middle piece
Acrosome phase
11. Unneeded cytoplasm is shed as residual body
Intercellular bridges are lost
Maturation phase
15. An update on sperm retrieval techniques
for azoospermic males
Non ejaculated sperm is aspirated from the
epididymis and testis of the patient using
surgical method
Update
