ANAT 1502 Gametogenesis - Compact Spongy Basal layer...

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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 layer...

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