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16 Cards in this Set
- Front
- Back
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what is created by gametogenesis and how |
haploid mature germ cells (out of gonocytes) by meiosis |
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gonocytes |
originate in embryo after 21 days 5th week- migrate to genital ridges 7th week- differentiate testicles and ovaries |
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structure of testes |
outer connective dense tissue- tunica albuginea septa- connective tissue, internal division mediastinum- connective tissue near hilum |
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where is sperm produced |
seminiferous tubules, inside one of ~ 250 lobules made by the septa devision. |
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where is testosterone produced |
leydig cells in the connective stroma between the seminiferous tubules |
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functional tissue of testes |
parenchyma containing: seminiferous tubules 30-70 cm long (germinal epithelium+lamina propria- lining the tubules) |
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germinal epithelium |
germ cells- stratified epithelia sustentacular cells (sertoli cells)- supporting cells |
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germ cells (5 types) |
-spermatogonia (A-dark- stem cell, A-pale-turns into spermatids) -1st order spermatocytes -2nd order spermatocytes -spermatids -sperm |
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sustentacular cells (sertoli cells) functions (3) |
columnar cells surrounding spermatogenic cells -produce ABP (androgen binding protein) that binds testosterone -tight junctions create blood testes barrier -produce inhibin (inhibin FSH) |
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leydig cells |
secrete testosterone (male genitelia formation in fetus and spermatogenesis later) |
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duration of full gametogenesis |
64 days |
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regulations of spermatogenesis |
done by pituitary gland FSH command sertoli cells LH stimulate leydig cells |
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process of germ cell |
A-dark---> A-pale---> primary spermatocytes---> (mieosis 1) secondary spermatocytes---> (mieosis 2) spermatids |
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Spermatid specializations (3) |
Flagellum- tail for movement Acrosome- sac with oocyte membrane destroyers mid-piece- where mitochondria is |
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what happens in epididymis |
sperm cells gain motility by factors produced in epididymis FMP factor motility protein is stimulated |
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decapacitation of sperms |
removal of cell plasma membrane proteins and reorganization of membrane (for efficiency)- happens in female reproductive tract |
