Sexuality

passage of urine and semen

opening of urethra

• 2 columns of spongy erectile tissue
• top side of penis

fill with blood during erection

(clitoris in women)

• underside of penis
• spongy tissue
• fills with blood during erection

• tip
• head of penis
• huge amount of nerve endings

crown b/t glans and shaft

remove anything from vagina

• foreskin
• over glans
• removed during circumcision

glands under foreskin

produce smegma

base of penis

anchor to pelvic bone via crura

loose skin that holds testes

raises and lowers testes in response to temperature changes

94degrees

nerve fibers swell the arteries of penis

allowing blood to rush into corpora cavernosa and corp spongiosium

production of sperm in testes


13-14 yrs mature sperm

manufacture sperm

maintains optimal spermatogenesis

1/4 mile tubing in each

produce testosterone

(in testes)

sperm producing tubes winding through testes

top of testes

holds sperm until they mature

connected to semiferous tubules

tightly coiled ducts in testes where sperm is produced

greenish picture

one of two long tubes that mix other fluids to create semen

2 glands under bladder

causes semen to coagulate

main 50% of ejaculate

• soft in humans
• hardens in other species

seals female reproductive tract (flow back)

• mature sperm
• 23 chromosomes

determine gender of baby

70% modal - hunt egg

transports spermatazoa from vas deferns to urethra

pre-ejaculate

pair of glands that lie below prostrate

immature sperm cell that will develop into a spermatocyte

intermediate stage of spermatozoon

final stage in the production of sperm

sperm formation takes 72 days/300m a day

• 1.stimulation:
• epididymis, seminal vesicles, prostrate empty fluid into uretral bulb while the bladder is closed off the prevent urine from being expelled
• 2. contractions usually orgasim

begins in brain around 10

hypothalmus releases GnRH & LH

LH stimulates testoserone in testes

LH & Testosterone stimulate sperm production

w/LH to produce sperm

• hair
• growth spurts
• deep voice
• metabolism

70-80

• spermogenesis decreases
• ejaculate thinner
• lower testosterone

testes fail to descend into sctotum

temp = no sperm

twisting of testicles spermatic cord

painful persistent erection

blood trapped in penis

calcifications in penis = curved penis

damage liver

shrink testicles

serum lipids and reproductive systems damaged