Male anatomy

Question 1

Penis

Answer 1

• structure: shaft is external portion of penis, contains 3 erectile structure -> two corpora cavernosa and one corpus spongiosum, root is internal portion of the 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 penis

Question 3

Foreskin

Answer 3

• structure: loose tubular fold of skin
• location: partially or completely covers the glans
• function: unclear, may protect the glans

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 arousal

Question 5

Spongy body (corpus 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 glands 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 on 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 regions

Question 8

PC 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: have two main functions; produce sperm, secrete sex hormones

Question 10

Seminiferous Tubules

Answer 10

• structure: convoluted microscopic tubes
• location: located inside each testis
• function: production of sperm

Question 11

Sperm

Answer 11

• structure: head: contains genetic information. tail: motility
• location: produced in seminiferous tubules
• function: fertilization of ovum, each man produces about 100 million sperm per day

Question 12

Interstitial cells

Answer 12

• location: between seminiferous tubules in testis
• function: secrete sex hormones

Question 13

Epididymis

Answer 13

• structure: convoluted tube
• location: one on each testicle
• function: site of sperm maturation and storage

Question 14

Vas deferens

Answer 14

• structure: tube
• location: in between the epididymis and the ejaculatory duct
• function: transport and storage of mature sperm form the epididymis to the ejaculatory duct

Question 15

Ejaculatory duct

Answer 15

• structure: formed by the junction of the vas and the duct of the seminal vesicle
• function: empties into urethra within the prostate

Question 16

Prostate gland

Answer 16

• structure: single gland slightly larger than a walnut
• location: located at the base of the bladder that surrounds the urethra
• function: prostate secretions ( a cloudy, alkaline fluid) are a major component of semen

Question 17

Seminal vesicles

Answer 17

• structure: two glands
• location: situated to either side of the prostate
• function: NOT storage areas for sperm, ass their own secretions to sperm

Question 18

Bulbourethral glands & pre-cum (Cowper’s Glands)

Answer 18

• 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