B8 W3 Flashcards
White, fibrous capsule on testes
Tunica albuginea
Tunica vaginalis
Layer of serous membrane covering the testis derived from peritoneum.
Cells that for inner epithelia of seminiferous tubules
Sertoli cells
Where does spermatogenesis occur within seminiferous tubule?
Gaps between sertoli cells
Where does spermatogenesis occur within seminiferous tubule?
Gaps between sertoli cells
What prevents passage of spermatoza into blood?
Junctions between sertoli cells
Sustencular cells
Cells which support gamete devElopment
Male sustencular cells
Sertoli cells
Female sustencular cells
Granulosa cells
Phases of spermatogenesis
Mitotic proliferation, meoitic proliferation, cytodifferentation
Produced at the end of mitotic proliferation of spermatogenesis
Resting primary spermatocytes
Resting primary spermatocytes
Cells which breach the tight junctions of sertoli cells and move into luminal compartments
Produced at the end of meiosis
Spermatid
Production of secondary spermatocyte
Meiosis- two divisions. First division has genetic shuffling to produce secondary spermatocyte. Second division to generate four haploid spermatid
Cytodifferentiation
Cytoplasmic bridges break open and release spermatids into seminiferous tubule
Number of clones of spermatids from 1 A1 spermatogonium
25
Final stage of spermatogenesis
Spermiogenesis. Golgi apparatus migrates to the poles and forms vesicle. Formation of streamlined spermatozoa
What forms the acrosome?
Occurs during spermiogenesis by action of golgi apparatus giving rise to glycoprotein rich granules which coalesce
What forms the flagella of sperm?
Centrioles
Interval cycle in spermatogenesis
16 days
What initates germ cell development?
Specification of primordial germ cells in endoderm
Where do primordial germ cells colonise?
The gonadal ridge
Origin of sertoli cells
Coelomic epithelia in medulla
Roles of testis
Spermatogenesis and hormone production
