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Anatomy of Male Reproductive SystemMajor Organs
Reproductive System
External Reproductive
Function: producing offspring Organs
propagation of the species penis and scrotum
in terms of evolution Internal Organs:
– the only reason all the other systems exist
these structures form
only major system that doesn’t work continuously continuous tube:
! only activated at puberty
unlike most other organisms on
planet
Testes
! mammals only reproduce sexually epididymus vas
deferens
ejaculatory duct
humans are dieocious
urethra in penis
! separate sexed (many animals are monoecious or hermaphrodites)
in 7th week of embryonic development genes are activated that trigger Accessory organs
differentiation of gonads
seminal
vesicles
prostate gland
bulbourethral glands
1. Penis and Scrotum
penis is transfer organ
glans expanded head
prepuce foreskin
1
both have modified
sebaceous glands that produce waxy
secretion = smegma
2
, a. seminiferous tubules
(700’ of seminiferous tubules in testes)
functions in spermatogenesis:
penis contains erectile tissues that surrounds the urethra
formation and maturation of
fill with blood during sexual arousal
sperm cells
in
corpus spongiosum (lower – surrounds urethra) passes along cross section:
ventral side of penis and
encloses urethra seminiferous tubules
appear roughly circular and contain germinal epithelium
(containing germ cells) and sustentacular
2 coropora cavernosum (upper) (Sertoli) cells
on dorsal side
Sertoli cells protect germ cells and promote their
development
all contain numerous tiny blood sinuses =
lacunae
b. interstitial cells
are scattered between the seminiferous tubules
scrotum keeps testes at cooler temperature
sperm can only be produced at several degrees below normal body temp function in hormone secretion
testosterone
2. Testes (=testicles)
1. development and maintenance of secondary sexual characteristics
primary reproductive organ of male
2. stimulates protein synthesis
testis enclosed by white fibrous capsule
3. promotes growth of skeletal muscles
interior is divided into several hundred lobules divided by
septa
3. Epididymis
each lobule contains:
epididymis is highly coiled, 18’ tube that sits on outside of
testes
3 4
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