Chapter25ReproFemaleMarieb

Chapter25ReproFemaleMarieb - Ch 24: The Reproductive...

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Ch 24: The Reproductive System, Part 2 pp 723-747 Gonads = ovaries Gametes = ova (one/month) Unlike the male, mostly internal Female repro system must produce gametes AND maintain developing embryo Developed by John Gallagher, MS, DVM
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Overview of Anatomy
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Ovaries Retroperitoneal Broad Ligament Suspensory Ligament Functions: Ovum production Hormone production Circulation: Ovarian Artery and Vein
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Histology Capsule: Tunica albuginea Germinal epithelium (misnomer) Ovarian cortex with developing gametes Medulla has blood supply
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Oogenesis ( = ovum production) Takes place inside ovarian follicles in ovaries as part of ovarian cycle Oogonia (= stem cells) complete mitotic divisions before birth At birth: ~ 2x10 6 primary oocytes At puberty: ~ 400,000 primary oocytes 40 years later: 0 (even though only ~ 500 used) Atresia
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Ovulation Oogenesis Fig 24.15 Ovarian cycles start at puberty under influence of estrogen.
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Oogenesis 1. Primordial follicle 1. A dormant stage, ready to develop 2. Each month some proceed 3. Most (99%) atrophy (atresia)
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Oogenesis 2 . Primary follicle (days 3-8) 1. Double layer of theca cells 2. Enlargement due to estrogen 3. More atresia
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Oogenesis 3. Secondary follicle (days 8-10) 1. Liquor folliculi appears 2. Theca more developed 3. Granulosa cells producing estrogen, under influence of FSH 4. Zona pellucida visible
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4. Tertiary (Graafian or vesicular) follicle (days 11-14) 1. Ready for ovulation 2. Theca well developed 3. Granulosa cells secreting estrogen
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This note was uploaded on 12/16/2011 for the course BIOLOGY 101 taught by Professor Mr.wallace during the Fall '11 term at Montgomery College.

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Chapter25ReproFemaleMarieb - Ch 24: The Reproductive...

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