Male Repro Flashcards
function of the testes
spermatogenesis and hormone production
spermatogenesis
spermatozoa produced in seminiferous tubules of testes
hormone production - testes
androgens (male sex hormones) produced in interstitial cells of the seminiferous tubules
- principal androgen = testosterone
what are testes
male gonads. repro cells formed in the testes, located outside of the body in the scrotum (need to be kept cooler than body temp to produce viable spermatozoa )
scrotum
cutaneous sac of skin outside of the body cavity which holds the testes in mammals - structure derived from skin and connective tissue from the abdominal wall to regulate temp
where do testes develop in utero?
inside abdominal cavity near the kidneys. they then move to the scrotum outside of the body cavity, need to pass through inguinal canal
are all testes located outside of the body?
some mammals and most birds have their balls on the inside
what are inguinal rings/canal
like some sort of spinchter, lil ring that closes around the testes - testes pulled through before birth or shortly after
gubernaculum
band of connective tissue that attaches testes to scrotum
balls dont descend in farm animal - consequences?
production and economic effects
- sterile
- no value as a breeding animal
cremaster muscle
passes through inguinal ring and attaches to scrotum, adjusts position of testes relative to the body - ensures viability for spermatozoa
seminiferous tubules
sperm production takes place in these u-shaped tubes.
1-25B a day in these tubes
testosterone production
in interstitial cells between semiferous tubules. responsible for male secondary sex characteristics/libido - enhanced muscle and bone development
testosterone implants
helps to increase gains, feed conversion, carcass weight/muscling
speeds bone development, decrease fat deposition
spermatic cord
suspends testis in scrotum, links them w the rest of the body, includes blood vessels and nerves etc - designed for heat control as well