SOC152A Male Anatomy

Question 1

Penis

Answer 1

structure:
- Shaft is external portion of penis
- contains 3 erectile structures
two corpora cavernosa and one
corpus spongiosum
- Root is internal portion of penis
- lies in the body
- approx. 2 inches long
- connects the underlying
structures of the shaft to the pelvic cavity

location:
- External male genitalia

function:
- Involved in sexual arousal, excretion of urine and transfer of sperm

Question 2

glans (head)

Answer 2

structure:
- smooth, acorn shaped
- well-endowed with nerve endings

location:
- at the tip of the penis

Question 3

foreskin (prepuce)

Answer 3

structure:
- loose tubular fold of skin

location:
- partially or completely covers the glans

function:
- unclear, may protect the glans
- smegma –> can build up under the foreskin and develop a foul smell/taste; can be avoided w/ regular cleaning

Question 4

cavernous bodies (corpora cavernosa)

Answer 4

structure:
- Two erectile structures located within the shaft of the penis

location:
- Twin structures that lie side by side along the upper side of the penis

function:
- Fill with blood during arousal
- Account for most of the penile erectile ability

Question 5

spongy body (corpora spongiosum)

Answer 5

structure:
- Erectile structure located within the shaft of the penis

location:
- Near the midline of the penis
- On its lower surface
- Extends from the shaft into the glans

function:
- Spongiosum raises visible ridge on the underside of the penis during sexual arousal

Question 6

Urethra & Urethral Opening

Answer 6

structure:
- Narrow tube

location:
- Urethra located in the shaft
- Urethral opening located on the glans near the frenulum

function:
- Transport of urine and semen

Question 7

Corona & Frenulum

Answer 7

structure:
- Corona: rim of glans
- Frenulum: strip of loose skin on the underside of the penis

location:
- Corona: located around the glans
- Frenulum: runs between the glans and the shaft

function:
- Corona and frenulum are usually the most erotically sensitive region

Question 8

PC (Pubococcygeus) Muscle

Answer 8

structure:
- Underlies/supports pelvic organs

location:
- Underlies/supports pelvic organs

function:
- Contraction during sex stiffens vaginal walls
- Contractions stronger at orgasm
- prevents urinary/fecal leakage
- PC muscle control can allow men the ability to delay ejaculation

Question 9

Scrotum

Answer 9

structure: Sack like

location: Located behind the penis

function:
- Contains testicles
- Maintains proper testicle temperature
- Stimulation of the scrotum is sexually
arousing to most men

Question 10

Testicles

Answer 10

structure: twin egg-shaped structures

location: in the scrotum

function:
- Have two main functions
- produce sperm
- secrete sex hormones
*Akin to ovaries in women

Question 11

Seminiferous Tubules

Answer 11

structure: Convoluted microscopic tubes

location: Located inside each testis

function: Production of sperm (spermatogenesis)

Question 12

sperm

Answer 12

structure:
- Head: contains genetic information
- Tail: mobility

location: Produced in seminiferous tubules

function:
- Fertilization of ovum (egg)
*Each man produces about 100 million sperm per day

Question 13

Interstitial Cells

Answer 13

location: Between seminiferous tubules in testis

function: Secrete sex hormones

Question 14

Epididymis

Answer 14

structure: Convoluted tube

location: One on each testicle

function: Site of sperm maturation and storage

Question 15

Vas Deferens (Vas)

Answer 15

structure: tube

location: In between the epididymis and the
ejaculatory duct

function: Transport and storage of mature sperm from the epididymis to the ejaculatory duct

Question 16

Ejaculatory Duct

Answer 16

structure: Formed by the junction of the vas and the duct of the seminal vesicle

function: Empties into urethra within the prostate

Question 17

prostate gland

Answer 17

structure: Single gland slightly larger than a walnut

location: the base of the bladder that surrounds the urethra

function: Prostate secretions (a cloudy, alkaline fluid) are a major component of semen

Question 18

Seminal Vesicles

Answer 18

structure: Two glands

location: Situated to either side of the prostate (located behind the bladder)

function:
- NOT storage areas for sperm
- Add their own secretions to semen

Question 19

Bulbourethral Glands & Pre-cum
(Cowper’s Glands)

Answer 19

structure: two pea-sized glands

location: Near the root of the penis (below the prostate gland)

function: Their secretions (often called pre-cum) are excreted prior to ejaculation