figure 43.5 ooogenesis
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27 Terms
before birth: at birth , all primordial follicles are already present and contain primary oocytes arrested in prophase 1
oocyte
primordial follicle
throughout life until menopause: primordial follicles begin to grow and develop (Before pubery all developing feollicles undergo atresia)
primordial follicle second stage
primary follicle
secondary follicle
from puberty to menopause: After puberty, some vesicular follicles are rescued from aterisa each month and the primary oocyte in one (the dominant follicle) completes meiosis 1)
vesicular (antral) follicle
ovulated secondary oocyte
corpus luteum (develops from ruptured follicle)
oogonium (stem cell)
mitosis
primary oocyte
meiosis begins but arrests
primary oocyte second stage
primary oocytes!
spindle
meiosis 1 completes
first polar body
secondary oocyte (arrested in metaphase 2)
meiosis 2 of polar body (may or may not occur)
sperm
polar bodies (all polar bodies degenerate)
meiosis 2 completed (only if sperm penetrates oocyte)
ovum
second polary body