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• quiz #6 (last one!) available until Monday at 11pm
• make sure to check all your grades later this week
• exam #4 Friday June 8th 2:30-4:20 in Hogness
• exam covers chapters 24, 25 & 26
1. Identify this space
2. What type of cells line line this space?
3. Identify this vessel
4. Identify these cells
5. What is their function?
“Where do babies come from?”
The Reproductive System
• Make gametes – egg & sperm
• Deliver sperm
• Place for gametes to meet - fertilization
• Place for the embryo/fetus to grow
• Way to get out – delivery
• Way to feed the newborn
testes
scrotum
Ductus (vas) deferens
rectum
bladder
Parietalperitoneum
abs
Pubissymphysis
urethra
penis
Prostate gland
Pelvic diaphragm
Tunica albuginea
Tunica vaginalis
Spermatic cord
epididymis
Ductus deferens
Seminiferous tubules
Rete testes
Efferentductule
testes
Tunica albuginea
Dartos muscle
Cremaster muscle
Superficial fascia
Layers of scrotum
Median septumof scrotum
Pampiniform plexus
Superficial Inguinal ring
Inguinal canal
Seminiferous tubules
epididymis
Efferentductules
Rete testes
Fig. 26.7(TE Art)
n nn
n
Type B spermatogonia
Type A spermatogonia
1o spermatocyte
2o spermatocytes
Sustentacular cell(Sertoli cell)
Spermatids
Spermiogenesis
Meiosis II
Meiosis I
2n
2n
2n
n nn
n
2n
2n
2n
nn nn
Lumen
spermatogenesis
FSH & LH
Pituitary gland
Test.
Interstitial (Leydig) cell
Sustentacular (Sertoli) cell: bind testosterone
hypothalamus
GnRH
Sperm Facts
• It takes 74 days for sperm to mature• Young men make 300,000 sperm/minute or 400 million/day• Avg. sperm count 50-120 million sperm/mL• Lower than 20-25 million/mL = infertility• Sperm count has dropped over last 60 years
– avg. 113 million/mL in 1940 – avg. 66 million/mL today– semen volume has decreased as well
Testicular cancer
• cancer of the testes• most common in males age 15-35• abnormal mass in testes• good survival rate if found early
Lance Armstrong• 1996 – diagnosed with testicular cancer• metastasized to lungs & brain• 1997 – clean bill of health• 1999 – won 1st Tour de France
vasectomy
Dorsal view
Bulbourethral gland
Prostate gland
Seminal vesicle • 60% of semen• fructose, fibrinogen & PG’s
• 30% of semen• base, clotting enzymes & fibrinolysin
• base & lubricant
ureterDuctus deferens
Anterior view
Prostatic urethra
Spongy urethra
Internal urethral sphincter
External urethralsphincter
Prostatic utricle
prepuce
glans
Urethral orifice
Corpus spongiosum
Corpuscavernosum
Dorsal artery & nerve
Dorsal vein
Corpuscavernosum
Deep artery
Tunica albuginea
Corpus spongiosum urethra
Parasympathetic NS: vasodilation
Sympathetic NS: peristalsis, sphincter closure & muscle contraction (200 inches/sec)
Nitric oxide
Parasympathetic nerves
Dilate vessels
Viagra AlcoholDrugsAntidepressantsTagametAppetite suppressorsVascular problemsDiabetesStress
+-
cGMP