11. Embryology Testis 08

11. Embryology Testis 08 - Embryology of the Testis Parks...

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Unformatted text preview: Embryology of the Testis Parks and Jameson Endocrinology 146(3):1035–1042 Human Testicular Development T. Klonisch et al. Developmental Biology 270 (2004) 1–18 8 week human 7 week human Medulla : inner part Cortex : outermost layer 16-20 week human 20-24 week human Cell Lineages in Testis & Ovary Soder (2007) Best Practice & Research Clinical Endocrinology & Metabolism 21: 381–391. Timing of Major Testicular Events in Mammals • Variation among mammals in timing • Process similar T. Klonisch et al. Developmental Biology 270 (2004) 1–18 Genes - Ovary/Testis Development Parks and Jameson Endocrinology 146(3):1035–1042 Scrotum • in most adult mammals testis lies in the in most adult mammals testis lies in the scrotum scrotum – migrates there through the body wall - migrates there through the body wall - inguinal inguinal canal canal – some exceptions: some exceptions: • testis is lumbar - testis is lumbar - monotremes monotremes , elephants, hyraxes , elephants, hyraxes • inguinal canal - hedgehogs, moles, some seals inguinal canal - hedgehogs, moles, some seals • seasonal migration - wild ungulates, most rodents seasonal migration - wild ungulates, most rodents Cryptorchidism Cryptorchidism • • cryptorchidism cryptorchidism - "hidden" "abdominal"- "hidden" "abdominal" testis testis – Undescended Undescended testis in those species testis in those species with scrotal testis with scrotal testis...
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11. Embryology Testis 08 - Embryology of the Testis Parks...

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