ANAT 1502 Gametogenesis - – Compact – Spongy • Basal...

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Gametogenesis Monday, July 12, 2010
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Meiosis • Chromosome number is halved (23) • Two divisions – 1 st division • Homologous chromosomes pair (prophase) • Then they separate (anaphase) • At this point the cells are haploid, but with double the amount of chromosomal material – 2 nd division divides the amount of chromosomal material in half Monday, July 12, 2010
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Spermatogenesis • Formation of mature spermatozoa from spermatogonia; it takes about two months to complete • Begins at puberty • Happens in the walls of the seminiferous tubules • Spermiogenesis – transformation • Mature sperm are stored in the epididymis Monday, July 12, 2010
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Oogenesis • Formation of mature oocytes from oogonis • Begins during the fetal period, but is not completed until after puberty • Primary oocytes remain in prophase until shortly before ovulation • Secondary oocytes remain in metaphase until they are fertilized Monday, July 12, 2010
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The Uterus • Layers – Perimetrium – Myometrium – Endometrium • Functional layer
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Unformatted text preview: – Compact – Spongy • Basal layer Monday, July 12, 2010 Ovarian cycle • Several (up tp 14) follicles grow, but only one will mature – Growth and differentiation of primary oocyte – Proliferation of follicle cells – Formation of zona pellucida – Development of theca folliculi • Ovulation occurs after a LH surge • After ovulation , the walls of the follicle collapse to form the corpus luteum Monday, July 12, 2010 Menstrual cycle • Lasts about 28 days (but can vary between 25-35 days) • Menstrual phase • Prliferative phase • Luteal phase Monday, July 12, 2010 If Fertilization Does Not Occur • Corpus Luteum degenerates • Progesterone and estrogen decrease • Luteal phase becomes the ischemic phase • Menstruation begins Monday, July 12, 2010 If Fertilization Does Occur • Corpus luteum continues to produce progesterone • Uterus stays in luteal phase • Menstruation does not occur Monday, July 12, 2010...
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ANAT 1502 Gametogenesis - – Compact – Spongy • Basal...

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