• quiz #8 (last one!) available this Friday at 3pm until Monday at 11pm

• quiz #8 covers chapter 26

• make sure to check all your grades this week

• exam #4 Friday June 9th 2:30-4:20 in Kane 110 or Kane 210

• exam covers chapters 24 (pp 692-702), 25 & 26

“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

Posterior view

ureter

Ductus deferens

urethra

epididymis

Bulbourethral gland

Prostate gland

Seminal vesicle

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

• quiz #8 (last one!) available this Friday at 3pm until Monday at 11pm

• quiz #8 covers chapter 26

• make sure to check all your grades this week

• exam #4 Friday June 9th 2:30-4:20 in Kane 110 or Kane 210

• exam covers chapters 24 (pp 692-702), 25 & 26