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Spermatogenesis and Oogenesis
Transcript of Spermatogenesis and Oogenesis
produce 4 daughter cells as a result
Oogenesis leads to one final ovum; Spermatogenesis utilizes all four daughter cellls
In Oogenesis, the three, smaller polor bodies disintegrate
Millions of sperm are produced at a time; only one ovum matures monthly
Spermatogenesis begins at puberty; Oogenesis begins at birth
Spermatogenesis ends at death; Oogenesis ends at menopause
Spermatogenesis takes 7 weeks; Oogenesis takes between 10-50 years Head
acrosome (lysosome with enzymes to dissolve protective layers around egg) surrounded by layer of smaller cells making up follicle
small follicle cells multiply "providing nourishment for the developing cycle...also [releasing] estrogen into bloodstream" cytoplasm contains large fatty granules constituting yolk
germinal vesicle (nucleus)
germinal spot (nucleolus)
zona pellucida (envelope)
striated appearance due to numerous pores to channel nutrition
“No one’s ever looked at this before across sperm components. What we show is that measurements on other sperm parts, such as the flagellum that propels the sperm, can provide additional information about the quality and consistency of sperm manufacture.” -Mossman
“The finding could give clinicians new insight into the diagnosis and treatment of male fertility problems, which accounts for up to 50 percent of the cases where couples struggle to conceive.” Midpiece
mitochondria (provides energy needed to move tail) Tail
long flagellum ("whiplike" motions to produce movement) Structure and Function of Ovum masteringbio.com Gray's Anatomy by Henry Gray http://images.webster-dictionary.org/dict/105/144345-egg-cell.gif masteringbio.com http://www.sparknotes.com/testprep/books/sat2/biology/chapter7section2.rhtml http://www.sparknotes.com/testprep/books/sat2/biology/chapter7section2.rhtml
http://www.sparknotes.com/testprep/books/sat2/biology/chapter7section2.rhtml masteringbio.com "Between 1989 and 2005, the number of sperm with regular shapes, in French men, drastically dropped 33%.
Scientists think more genes take part in spermatogenesis (male process) than in oogenesis (female process). The scientists also say that maybe oogenesis has more “proof reading” mechanisms so as to stop any mutations. " http://www.slate.com/articles/health_and_science/explainer/2012/12/sperm_decline_in_france_why_is_it_so_hard_to_make_a_good_sperm_cell.htm http://www.redorbit.com/news/health/1112730908/variation-sperm-length-not-good-111312/ There is a new treatment for teen boys or pre-teen boys who have to have cancer treatment. Formerly, these boys have often been unable to reproduce as an effect of the treatment, but now scientists think that by taking some cells used in spermatogenesis (from the boys) and saving them in a freezer, these boys will be able to have children when they reach adulthood. “But if a sample of a boy’s spermatogonial stem cells could be extracted and preserved before cancer treatment and re-implanted after the boy reached adulthood, this fertility problem could be circumvented." http://www.redorbit.com/news/health/1112503525/penn-research-points-to-new-way-of-preserving-fertility-for-boys-undergoing-cancer-treatment/