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Anatomy of the Male Reproductive System

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Anatomy of the Male
Reproductive System
ANSC 5063
Testicle begins development in mesonephric region of the embryo
and is pulled, by the gubernaculum, along with a fold of the
peritoneum into the scrotal region
Location outside of the body cavity is important
for temperature control, testicle must be 2-4 deg.
below body temperature for sperm production
Spermatic cord
Spermatic artery
Pampiniform plexus
Deferent duct (vas deferens)
Cremaster muscle
Temperature control
Scrotal sac
Location
Thermosensors in skin
Sweat glands
Insulation
Tunica dartos
Male Tubular System
Seminiferous tubules
Rete tubules
Epididymis
Head
Body
Tail
Ductus deferens (vas deferens)
Urethra
Accessory Glands
Ampulla
Vesicular glands
seminal vesicles
Prostate gland
Disseminate
Corpus
Bulbourethral gland
Seminiferous Tubule – cross section
Sertoli Cells (nurse cells)
Receptors for FSH & testosterone
Produce – androgen binding protein
- sulfated glycoproteins
- transferin
- inhibin
Junctional complexes
Leydig Cells (interstitial cells)
Receptors for LH
Produce Testosterone
Spermatogonia – division by mitosis
Spermatocytes – division by meiosis
Intercellular bridges
Rete Testis
Epididymis
Head – not motile
- proximal cytoplasmic droplet
Body – gain motility
- cytoplasmic droplet moves distal
Tail – progressive forward motility
- rotational movement
- only a few distal cytoplasmic droplets
- fertile potential
- primary storage site
Ejaculation
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