ReproLect

ReproLect - Structure of the wall of a Seminiferous Tubule...

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Unformatted text preview: Structure of the wall of a Seminiferous Tubule F 22.5c Note: Fig 22.5c does not show that sperm cells in various stages of development (spermatogonia, 1 o and 2 o spermatocytes, and spermatids) are located between adjacent Sertoli cells as indicated in insert from Fig 22.8. F 22.8 Spermatogenesis F 22.8 23 diploid chromosomes 46 bivalent pairs (sister chromatids) 23 bivalent pairs (sister chromatids) 23 haploid chromosomes 23 diploid chromosomes 23 haploid chromosomes Functions of Sertoli Cells Table 22.1a Supports spermatogenesis Regulates FSH Inhibits development female organs Isolates sperm from immune system Concentrates testosterone in lumenal fluid * F 22.6 * Sertoli cells also secrete Androgen Binding Protein which regulates androgen levels bathing cells undergoing spermatogenesis Hormonal Control of Male Reproduction H H Dihydrotestosterone 5- -reductase (reduces 4-5 bond) N & = CH 3 * Active Steroid Hormones aromatase (C19 demethylation) = CH 3 * * * * * * * F 22.12 Oogenesis...
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ReproLect - Structure of the wall of a Seminiferous Tubule...

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