spermatogenesis and spermiogenesis
TRANSCRIPT
Babol7-3-15
HistologyDoc. Alma Maria Daguay M.D.
Spermatogenesis and Spermiogenesis
The process whereby haploid gametes (reproductive sex cells) are created
Spermatogenesis in males
Oogenesis in females
Gametogenesis
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
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 SpermatogenesisABPSSS
SG
PS
M
F
SC
ESLS
SS
LC
Cell differentiation in which spermatids become sperm
Flattening of nucleus
Formation of acrosome
Growth of tail
Reorganization of mitochondria
Shedding of unnecessary cytoplasm
Spermiogenesis
Proacrosomal vesicles coalesce as a single acrosomal cap
Centrioles migrate and act as basal body
Golgi Phase
Acrosomal cap spreads over half of the nucleus
Contain acrosin
Cap phase
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
Unneeded cytoplasm is shed as residual body
Intercellular bridges are lost
Maturation phase
Establishing blood testis barrier
Sertoli cells
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
Open Epididymal Fine-Needle Aspiration
Testicular Sperm Extraction (TESE)
Single Seminiferous Tubule Biopsy
Percutaneous Epididymal Sperm Aspiration (PESA)
Testicular Sperm Aspiration (TESA) and Testicular Fine-Needle Aspiration (TEFNA)
Microsurgical Epididymal Sperm Aspiration (MESA)