Human Sexuality - Sept 15,2010

Male Sexual Anatomy

External Organ

Penis

- glands are the rounded tip, separated by shaft of the penis by corona

- most sensitive

- skin folds over glands, foreskin - can be removed through circumcision

- root of penis in body

-crura attaches attaches penis to pelvic bones

-cylinders of spongie like tissue, surround

-cavities fill with blood during sexual erection

- Does not contain bone or muscle, except at root of penis, for muscular control of urination

Scrotum

- Two testicles, produce sperm and hormones that guide development of male body

- The temperature has to be just right to produce semen

- When the scrotum is held closer to the body, it reduces sperm count. Tight underwear, hot baths and showers, can result to low sperm count.

Testes

- Internal sex organ

-held inplace by a fairly rigid membrane

- sperm production and hormone production

- Male hormones are androgens ex. testosterone

- Male hormones are necessary for maintaining the male genitalia,

- Testosterone is necissary to maintain, male sexual characteristics throughout life ex. puberty and facial hair

-Takes 70 days for sperm to create and grow to 'adult'

- Stored in edpididymis where sperm will mature, abnormal sperm will be destroyed

- Testicular cancer, rare, but most common cancer in young men.

- Higher risk in men whos testes did not decend

- Seminal vesicles moves semen along.

- Fructos, gives sperm energy to move on their own

- Prostaglandins, cause uterine contractions.

- Small traces of antibiotics in semen

Prostate

- Grows over age, can interfere with urination

- Prone to cancer

- Urine can not travel with semen

- In a teaspoon there is over 500 million sperm

Circumsizion

- is removal of alot of the tissue on the penis

-painful surgical for children

- Anesthetics can not be used for infants, nervous system has not be developed.

- There can be long term effects

- By cutting the glands, it makes it an external organ

- The shaft and glands of the penis develop several layers of dry skin

-Sexual arousal is decreased in circumsized men, because there is so many nerve

endings in the foreskin, reducing penile sensation/sexual satisfaction

- Foreskin also provides lubrication

- If circumcision is not done well, men can suffer sensory loss, scaring that can effect the

penis causing soreness