139 13F Female Reproductive System - FEMALE REPRODUCTIVE...

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Bio 139 Fall 2013 FEMALE REPRODUCTIVE SYSTEM
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External genitalia
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External genitalia Two sets of labia: majora and minora Vestibule is region encompassed by labia minora Anterior border of labia minora form prepuce of clitoris Clitoris Consists of shaft and glans Contains many sensory receptors homologous to those in the penis Contains 2 corpora cavernosa Erectile tissues become engorged with blood in manner similar to penis Increase in girth, but not length Expand at base to form crus of clitoris, which is attached to coxae
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Internal structures
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The ovaries Germinal epithelium – visceral peritoneum on ovarian surface Tunica albuginea – dense fibrous CT below germinal epithelium Dense outer portion is cortex; inner portion is medulla Ovarian follicles are found within cortex
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The ovaries
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Ovarian follicles and oogenesis Oogenesis=meiosis in female Stem cells oogonia; differentiate into primary oocytes by birth Oocytes undergo meiosis; ovulated while still a secondary oocyte (in meiosis II) Will not complete meiosis unless fertilization occurs Follicles are structures within ovaries that contain the oocytes Develop from primordial to mature follicles while oocyte undergoes meiosis
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Ovarian follicles
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Ovarian follicles Before birth, about 5 million oogonia present within follicles about half of these degenerate by birth At birth, most of oogonia have become primary oocytes that have begun meiosis arrested in prophase I surrounded by single layer of granulosa cells structure is called primordial follicle At menarche, about 300,000 primordial follicles remain
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Ovarian follicles After menarche, FSH released in cycles stimulates maturation of primordial follicles into primary follicles Primary follicles characterized by growth of primary oocyte and enlargement of granulosa cells meiosis resumes granulosa cells form several layers now layer of clear material around primary oocyte is zona pellucida
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Ovarian follicles
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  • Fall '13
  • Michael Thompson
  • progesterone, Endometrium, Ovulation, Folliculogenesis

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