Human reproduction - male

SCROTUM

1. 2-chambered sac w/ testes inside
2. Muscles for temperature regulation

TESTES

1. SEMINIFEROUS TUBULES – sperm, 100 million/day!

2. INTERSTITIAL CELLS - testosterone
3. EPIDIDYMIS
a. Over the twins
b. Sperm maturation & storage

4. CAPSULE
a. Surrounds each, tough
b. Lots of pain receptors!

SPERM PATH

1. VAS DEFERENS - spermatic cord, transports sperm to. . .
2. URETHRA - Common passageway
*3. SEMINAL VESICLES - nutrients, 60%
*4. PROSTATE - Alkaline, 30%
*5. BULBOURETHRAL - Lubricant, 5%
*6. SEMEN = Sperm (5%) + 3, 4 & 5 (95%)

PENIS

1. Male organ of copulation
2. PREPUCE - foreskin, circumcision removes
3. ERECTION
a. Stimulation, lots of nerves in skin
b. Arteries dilate, veins close, fills with blood, large
c. Fascia - makes penis hard too
4. EMISSION - Collection of semen in urethra
5. EJACULATION - Expulsion of semen from penis

SPERMATOGENESIS

1. PROCESS (p. 132)
2. Nurse cells - protect sperm from immune system