Male External Genitalia

Question 1

What are the male external genitalia?

Answer 1

• scrotum

- penis

Question 2

What is the scrotum?

Answer 2

a cutaneous pouch

Question 3

What does the scrotum contain?

Answer 3

• testes
• epididymis
• lower part of the spermatic cord

Question 4

Where is the scrotum located?

Answer 4

behind the penis and below the pubic symphysis

Question 5

What marks the division of the scrotum into left and right compartments?

Answer 5

a median raphe

Question 6

What is the blood supply to the scrotum?

Answer 6

• external pudendal artery

- posterior scrotal branch of internal pudendal artery

Question 7

What is the nerve supply to the scrotum?

Answer 7

• anterior scrotal branch of ilioinguinal nerve
• genital branch of genitofemoral nerve
• posterior scrotal branch of perineal nerve
• perineal branch of posterior cutaneous nerve of thigh

Question 8

What is the penis?

Answer 8

the male organ of copulation

Question 9

What does the penis consist of?

Answer 9

• root

- body

Question 10

What is the root of the penis?

Answer 10

• the attached, nonmobile portion
• it lies in the superficial perineal pouch
• consists of three masses of erectile tissue:
  1. left and right crus of the penis
  2. bulb of the penis

Question 11

Describe the crura of the penis.

Answer 11

• each originates from the ramus of the corresponding ischium posteriorly
• each runs forward to join the crus of the contralateral side near the pubic symphysis

Question 12

What covers the crura of the penis?

Answer 12

each is covered by an ischiocavernosus muscle

Question 13

What do the crura become below the pubic symphysis?

Answer 13

the corpora cavernosa of the body of the penis

Question 14

Describe the bulb of the penis.

Answer 14

• lies between the two crura in the superficial perineal pouch
• runs forward

Question 15

What covers the bulb of the penis?

Answer 15

covered by the bulbospongiousus muscle

Question 16

What does the bulb of the penis become below the pubic symphysis?

Answer 16

the corpus spongiosum

Question 17

What pierces the posterior portion of the bulb of the penis?

Answer 17

the urethra

Question 18

What is the body of the penis?

Answer 18

• the free, pendulous part
• consists of three cylindrical masses of erectile tissue:
  1. two corpora cavernosa (continuations of the crura)
  2. corpus spongiosum (continuation of the bulb)

Question 19

What do the corpora cavernosa end in?

Answer 19

blunt projections

Question 20

What covers the blunt projections of the corpora cavernosa?

Answer 20

the glans penis

Question 21

Which is smaller, the corpora cavernosa or the corpus spongiosum?

Answer 21

corpus spongiosum

Question 22

What forms the glans penis?

Answer 22

the corpus spongiosum expands at the end to form it

Question 23

What does the corpus spongiosum contain?

Answer 23

the spongy/penile urethra

Question 24

What is the glans penis?

Answer 24

the expanded end of the corpus spongiosum

Question 25

What is the neck of the glans?

Answer 25

separates the glans from the rest of the organ

Question 26

What is the corona of the glans?

Answer 26

the prominent margin of the glans adjacent to the neck

Question 27

What is the external urethral orifice?

Answer 27

a median slit near the tip of the glans

Question 28

What is the prepuce?

Answer 28

- a fold of skin which covers the glans | - removed in circumcision

Question 29

What is the frenulum of the prepuce/glans?

Answer 29

a median fold which is attached near the external urethral orifice

Question 30

What are the parts of the urethra?

Answer 30

1. prostatic part (within prostate) 2. intermediate/membranous part (between prostate and bulb of the penis): surrounded by the external urethral sphincter 3. spongy/penile part (within the penis): in the corpus spongiosum 4. fossa navicularis: the expansion near the end 5. external urethral orifice

Question 31

Describe the superficial fascia of the penis.

Answer 31

continuous with the superficial perineal fascia

Question 32

Describe the deep fascia of the penis.

Answer 32

continuous with the deep perineal fascia

Question 33

Describe the tunica albuginea of the penis.

Answer 33

fibrous layer which encloses both the corpora cavernosa and corpus spongiosum

Question 34

Describe the fundiform ligament of the penis.

Answer 34

- arises from the linea alba and the superficial fascia of the abdomen - splits into left and right parts and encircles the body of the penis

Question 35

Describe the suspensory ligament of the penis.

Answer 35

- from the pubic symphysis and arcuate pubic ligament | - lies deep to the fundiform ligament

Question 36

What is the arterial supply to the penis?

Answer 36

- dorsal artery of the penis - deep artery of the penis - artery of the bulb - helicine arteries

Question 37

What is the venous drainage of the penis?

Answer 37

- superficial dorsal vein of the penis | - deep dorsal vein of the penis

Question 38

What is the innervation of the penis?

Answer 38

- dorsal nerve of the penis (from the pudendal nerve) | - cavernous nerves (supply erectile tissue)