Ch%2027%20Male%20Reproduction%20Lecture%20Presentation%20Fall%2c%202011-1

Htm sustentacularcellssertolicells

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Unformatted text preview: 8b, c Spermatogenesis Spermatogonium (2n) differentiation Primary spermatocyte (2n) Primary spermatocyte Division – 1st meiosis secondary spermatocyte (n) Spermatid (n) Spermiogenesis: Spermatids to Spermiogenesis: Spermatids to Sperm Late in spermatogenesis, spermatids are haploid but nonmotile Spermiogenesis – spermatids lose excess cytoplasm and form a tail, becoming sperm Spermiogenesis: Spermatids to Spermiogenesis: Spermatids to Sperm Sperm have 3 major regions: Head – contains DNA and has a helmetlike acrosome containing hydrolytic ______ that allow the sperm to penetrate the egg Midpiece – contains mitochondria spiraled around the tail filaments­­ What are the mitochondria for? Tail – a typical flagellum produced by a centriole­­ What are centrioles composed of? Spermiogenesis: Spermatids to Sperm Figure 27.9a Spermiogenesis spermatozoa Spermiogenesis: Spermatids to Sperm Spermiogenesis – spermatids lose excess cytoplasm and form a tail, becoming sperm spermiogenesis spermatogenesis http://distance.stcc.edu/AandP/AP/AP2pages/reprod/spermato.htm Sustentacular Cells (Sertoli Cells) Sustentacular Cells (Sertoli Cells) Extend from basal lamina to lumen­ surrounds developing cells They are bound togeth...
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