penis: erectile tissues, muscles, fascial coverings

Question 1

what happens to the erectile tissues during sexual arousal?

Answer 1

The erectile tissues fill with blood

Question 2

what happens when the erectile tissue fills with blood during sexual arousal?

Answer 2

produces an erection

Question 3

what are the root and body of the penis spanned by?

Answer 3

three masses of erectile tissue

Question 4

in the root, what are the erectile tissues known as?

Answer 4

left and right crura, and the bulb of the penis

Question 5

where is the bulb of the penis situated?

Answer 5

in the midline of the penile root

Question 6

what is the bulb of the penis transversed by?

Answer 6

urethra

Question 7

where are the left and right crura located within the penis?

Answer 7

laterally (to the bulb - either side)

Question 8

what do the left and right crura attach to?

Answer 8

to the ipsilateral ischial ramus

Question 9

where do the erectile tissues continue into?

Answer 9

the body of the penis

Question 10

where do the left and right crura move?

Answer 10

move anteriorly into the dorsal part of the penis

Question 11

what do the left and right crura form?

Answer 11

the two corpora cavernosa

Question 12

what are the left and right crura separated by?

Answer 12

by the septum of the penis, although often incompletely

Question 13

what does the bulb of the penis form?

Answer 13

forms the corpus spongiosum

Question 14

where does the corpus spongiosum lie?

Answer 14

ventrally

Question 15

where does the male urethra run?

Answer 15

through the corpus spongiosum

Question 16

why does the male urethra run through the corpus spongiosum?

Answer 16

to prevent the urethra from becoming occluded during erection

Question 17

what happens to the corpus spongiosum during erection? (why urethra runs through it)

Answer 17

the corpus spongiosum fills to a reduced pressure

prevents urethra from being occluded

Question 18

distally, what does the corpus spongiosum expand to form?

Answer 18

forms the glans penis

Question 19

how many muscles are there in the root of the penis?

Answer 19

4

Question 20

what are the 4 muscles in the root of the penis?

Answer 20

2 x Bulbospongiosus

2 x Ischiocavernosus

Question 21

what are the 2 bulbospongiosus muscles in the root of the penis associated?

Answer 21

associated with the bulb of the penis

Question 22

what does contraction of the 2 bulbospongiosus muscles in the root of the penis lead to?

Answer 22

It contracts to empty the spongy urethra of any residual semen and urine

Question 23

what do the anterior fibres of the bulbospongiosus muscles’ anterior fibres aid in?

Answer 23

aid in maintaining erection by increasing the pressure in the bulb of the penis

Question 24

what do the 2 x Ischiocavernosus muscles in the root of the penis surround?

Answer 24

surrounds the left and right crura of the penis

Question 25

what does contraction of the 2 x Ischiocavernosus muscles lead to?

Answer 25

force blood from the cavernous spaces in the crura into the corpus cavernosa – this helps maintain erection

Question 26

how many fascial covering does each mass of erectile tissue contain?

Answer 26

two fascial coverings each

Question 27

what is the most superficial layer of fascial covering of the erectile tissue?

Answer 27

the deep fascia of the penis

Question 28

what is the deep fascia of the penis (superficial layer of fascial covering of erectile tissue) a continuation of?

Answer 28

a continuation of the deep perineal fascia

Question 29

what does the deep fascia of the penis (superficial layer of fascial covering of erectile tissue) form? binding?

Answer 29

forms a strong membranous covering which binds the erectile tissues together

Question 30

what is the deep fascia covering of the erectile tissues?

Answer 30

the tunica albuginea

Question 31

what does the tunica albuginea form? (deep fascial covering of erectile tissue)

Answer 31

forms an individual capsule around each cavernous body