The Female Reproductive System Female Pelvis Side Basic
The Female Reproductive System
Female Pelvis - Side
Basic Roles Ovaries mature ova (eggs) produce estrogen and progesterone Fimbriea sweep released ovum into the oviducts
Basic Roles Fallopian Tubes (oviducts) transport ovum to the uterus Site of fertilization Uterus holds developing embryo site of implantation Endometrium: nurishing layer, grows each month in preparation for an embyo, then shed if not used Myometrium: muscular layer
Basic Roles Vagina Cervix receives the penis, site where sperm is deposited. Birth canal, child exits here. strong muscle, holds embryo in Aids in moving sperm into the uterus
Female Organs Front View
Female External Genitalia Labia minora and majora protect both urethra and vagina Clitoris Erectile structure
Breasts Contain mammary glands Consist of connective tissue that serves as support Targeted by oxytocin and prolactin
Discussion Topics Hymen Eptopic Pregnancy Tubes Tied Cervical Cancer
Oogenesis MATURING OF EGGS
THE EGG Is 100 um in diameter. Can only live for 1 day if not fertilized. Has about 140, 000 mitochondria in cytoplasm. Each ovary has 300, 000 – 400, 000 egg-forming structures (follicles). One egg is released each month from puberty to menopause (~ 400 in entire lifetime). Egg is covered with specialized outer coating that can be penetrated by sperm of the same species only.
Oogenesis takes place in the ovaries Oogonia Oocytes stem cells that are the precursors of ova (eggs) begin the first steps of the first meiotic division (meiosis I) and then stop. born with set number of oogonia At sexual maturity oocytes recommence their development on a monthly basis. Ova Only if fertilization occurs will meiosis II ever be completed and a mature ovum produced.
Oogenesis vrs Spermatogenesis
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