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Ch 10 spermatogenesis (process of producing spermatozoa) - Coggle Diagram
Ch 10 spermatogenesis (process of producing spermatozoa)
(1) Spermatogonia A Spermatogonia B
(256) Primary spermatocytes, secondary spermatocytes , spermatids
Seminiferous epithelium cycle understanding
Stages of the cycle
How the cycle is repeated
Cellular generations
Duration of one cycle
Testicular function requirements: pulsatile GnRh Secretion, High conc of T in the seminiferous tubules, low conc of T in the systemic blood, adequate LH receptors in leydig cells
takes place in the seminiferous tubules
2nd Meiotic phase- begins with primary spermatocytes (during meiosis 1 genetic diversity is present via DNA replication and crossover during the production of 2ndary spermatocytes). Conclusion of meiotic phase (2nd meiotic division) is production on haploid 91N) spermatids
meiotic prophase: preleptotene, leptotene, zygotene, pachytene, and diplotene
3rd differentiation phase - no further cell divisions, during this phase an undifferentiated spermatid undergoes a transformation that results in fully differentiated, highly specialized spermaozoon containing a head, flagellum, midpiece, and principle piece
Golgi phase ; acrosomic vesicle formation
Cap phase: acrosomic vesicle spreading over the nucleus
Acrosomal phase : nuclear and cytoplasmic elongation
maturation phase: final assembly that forms a spermatozoon
Spermatozoa = head +tail
Head = nucleus + acrosome + post nuclear cap
Tail = middle piece + principle piece +terminal piece
Tail is a self powered flagellum
1st phase: proliferation phase - mitotic divisions of spermatogonia generating a large number of B-spermatogonia
Important part of 1st phase is stem cell renewal- loss of intercellular bridges allows some spermatogonia to revert to stem cells from which new spermatogonia can develop
Total daily sperm output is correlated to testicular volume/ scrotal circumference