Penis

Question 1

What is emission?

Answer 1

mixing of components of semen in the prostatic urethra

Question 2

what is remission?

Answer 2

returning to flaccid state

Question 3

What are the three main parts of the penis?

Answer 3

Root, body and glans

Question 4

Describe the root of the penis

Answer 4

Most proximal part. Located in superficial perineal pouch of pelvic floor. Not visible.

Question 5

which erectile tissues does the root contain?

Answer 5

left and right crura, and bulb of penis

Question 6

which muscles does the root contain?

Answer 6

ischiocavernosus (x2) and bulbospongiosus (x2)

Question 7

describe the body of the penis

Answer 7

the free part of the penis, located between the root and glans. It is suspended from the pubic symphysis

Question 8

Which erectile tissues does the body contain?

Answer 8

two corpora cavernosa, and the corpus spongiosum

Question 9

describe the glans of the penis

Answer 9

most distal part. formed by distal expansion of the corpus spongiosum. contains external urethral orifice

Question 10

describe bulbospongiousus

Answer 10

associated with bulb in root of penis. It contracts to empty the spongy urethra of any residual semen and urine. The anterior fibres also aid in maintaining erection by increasing the pressure in the bulb of the penis.

Question 11

describe ischiocavernosus

Answer 11

surrounds the left and right crura of the penis. It contracts to force blood from the cavernous spaces in the crura into the corpus cavernosa – this helps maintain erection.

Question 12

what are the two fascia that cover erectile tissue?

Answer 12

The most superficial layer, immediately under the skin, is the external fascia of Colles (which is in continuity with the fascia of Scarpa which covers the abdominal wall).deep fascia of the penis (also known as Buck’s fascia). This is a continuation of the deep perineal fascia, and forms a strong membranous covering which holds all three erectile tissues together.

Question 13

What is tunica albuginea?

Answer 13

strong fascia under deep fascia. forming an individual capsule around each cavernous body and fused in the midline. The incomplete septum between the two corpora is comprised of tunica albuginea.

Question 14

Which ligaments support the root of the penis?

Answer 14

suspensory ligament and fundiform ligament

Question 15

Which ligament attaches the erectile bodies to the pubic symphysis, and is made of a condensation of deep fascia?

Answer 15

suspensory ligament

Question 16

Which ligament runs down from linea alba to surround penis like a sling, and attach to the pubic symphysis.

Answer 16

fundiform ligament

Question 17

what is the name of the double layer of skin and fascia, located at the neck of the glans? It is attached to the glans by the frenulum.

Answer 17

foreskin/prepuce.

Question 18

what is the name of the potential space between the glans and the prepuce?

Answer 18

the preputial sac

Question 19

What three arteries supply the penis?

Answer 19

dorsal arteries of the penis, deep arteries of the penis, bulbourethral artery.

Question 20

what main artery are these branches of?

Answer 20

internal pudendal artery, from internal iliac artery

Question 21

what vein drains the cavernous spaces?

Answer 21

deep dorsal vein of the penis (paired) - empties into prostatic venous plexus

Question 22

which vein drains superficial structures of the penis?

Answer 22

superficial dorsal veins

Question 23

which spinal cord segment supplies the penis?

Answer 23

S2 - S4

Question 24

What nerve supplies sensory and sympathetic innervation?

Answer 24

dorsal nerve of the penis, a branch of the pudendal nerve.

Question 25

which nerves gives parasympathetic innervation to the penis, which causes erection

Answer 25

cavernous nerves from the peri-prostatic nerve plexus