Flashcards in penis: erectile tissues, muscles, fascial coverings Deck (31):
what happens to the erectile tissues during sexual arousal?
The erectile tissues fill with blood
what happens when the erectile tissue fills with blood during sexual arousal?
produces an erection
what are the root and body of the penis spanned by?
three masses of erectile tissue
in the root, what are the erectile tissues known as?
left and right crura, and the bulb of the penis
where is the bulb of the penis situated?
in the midline of the penile root
what is the bulb of the penis transversed by?
where are the left and right crura located within the penis?
laterally (to the bulb - either side)
what do the left and right crura attach to?
to the ipsilateral ischial ramus
where do the erectile tissues continue into?
the body of the penis
where do the left and right crura move?
move anteriorly into the dorsal part of the penis
what do the left and right crura form?
the two corpora cavernosa
what are the left and right crura separated by?
by the septum of the penis, although often incompletely
what does the bulb of the penis form?
forms the corpus spongiosum
where does the corpus spongiosum lie?
where does the male urethra run?
through the corpus spongiosum
why does the male urethra run through the corpus spongiosum?
to prevent the urethra from becoming occluded during erection
what happens to the corpus spongiosum during erection? (why urethra runs through it)
the corpus spongiosum fills to a reduced pressure
(prevents urethra from being occluded)
distally, what does the corpus spongiosum expand to form?
forms the glans penis
how many muscles are there in the root of the penis?
what are the 4 muscles in the root of the penis?
2 x Bulbospongiosus
2 x Ischiocavernosus
what are the 2 bulbospongiosus muscles in the root of the penis associated?
associated with the bulb of the penis
what does contraction of the 2 bulbospongiosus muscles in the root of the penis lead to?
It contracts to empty the spongy urethra of any residual semen and urine
what do the anterior fibres of the bulbospongiosus muscles' anterior fibres aid in?
aid in maintaining erection by increasing the pressure in the bulb of the penis
what do the 2 x Ischiocavernosus muscles in the root of the penis surround?
surrounds the left and right crura of the penis
what does contraction of the 2 x Ischiocavernosus muscles lead to?
force blood from the cavernous spaces in the crura into the corpus cavernosa – this helps maintain erection
how many fascial covering does each mass of erectile tissue contain?
two fascial coverings each
what is the most superficial layer of fascial covering of the erectile tissue?
the deep fascia of the penis
what is the deep fascia of the penis (superficial layer of fascial covering of erectile tissue) a continuation of?
a continuation of the deep perineal fascia
what does the deep fascia of the penis (superficial layer of fascial covering of erectile tissue) form? binding?
forms a strong membranous covering which binds the erectile tissues together
what is the deep fascia covering of the erectile tissues?
the tunica albuginea