Male Urogenital Triangle Flashcards
What does the root of the penis consist of?
crura and bulb and associated muscles
What attaches to the internal surface of each ischial ramus and is continuous with corpora cavernosa?
the crura of penis
what muscle surrounds the crura of the penis?
ischiocavernosus m.
what is the function of the ischiocavernosus m.?
forces blood from crus into corpus cavernosum of penis, compresses deep dorsal v. of penis => erection
What is the innervation for the crura of the penis?
deep perineal n. (from pudendal n.)
What is the bulb of the penis?
central large mass of erectile tissue inferior to perineal membrane
The bulb of the penis is continuous with what structure?
corpus spongiosus
Which muscle surrounds the bulb of the penis?
bulbospongiosus m.
What is the function of the bulbospongiosus m.?
- forces blood into corpus spongiosum
- compresses deep dorsal v. of penis to increase turgidity of penis
- aids in emptying residual urine/semen from spongy urethra
How many muscles are located within the body of the penis?
essentially none, there may be a few fibers from ischiocavernosus or bulbospongiosus mm. though
What surrounds the corpora cavernosa?
thick, fibrous tunica albuginea
Which structure extends distally to form the glans penis?
corpus spongiosum, the CC has nothing to do with this
The tunica albuginea in the corpus spongiosum is much (thinner/thicker) than in the cavernosa?
thinner and more extensible
What are the parts of the glans penis?
corona, neck, prepuce, frenulum of prepuce; (external urethral orifice at distal end)
What are the functions of the superficial penile fascia?
mobility of skin on penis and contains the superficial neurovasculature supplying the penile skin
Where do the suspensory ligaments of the penis attach?
anterior surface of pubic symphysis to root of penis, fusing with deep penile fascia (anchoring erectile bodies to pubic symph.)
The artery of bulb, deep a. of penis and dorsal a. of penis are all branches off which artery?
internal pudendal a.
What does the dorsal a. of the penis supply?
fascial CT and the majority of penile skin
Which artery is responsible for erection of the penis?
deep a. of the penis
What does the artery of the bulb supply?
bulb (lol), corpus spongiosum, and spongy urethra
What does the external pudendal a. branch from and what does it supply?
branch from femoral a. and supplies proximal penile skin
what vein drains the erectile tissue of the penis?
deep dorsal vein of penis (–>prostatic venous plexus –> internal iliac v.)
What vein drains skin?
superficial dorsal vein of penis (–>superficial external pudendal v. –> external iliac v.)
where does the lymph from the penis drain to?
superficial inguinal nodes
What provides sensory innervation of skin and glans penis?
dorsal nerve of penis (terminal branch of pudendal n.)
what nerve carries parasympathetic fibers from the prostatic plexus of nerves?
cavernous nerve… responsible for innervating the deep a. of penis/erection
Is erection controlled by sympathetics or parasympathetics?
parasympathetics
Is emission controlled by sympathetics or parasympathetics?
sympathetics, via peristaltic action of ductus deferens and accessory glands
Ejaculation is caused by contraction of what muscle?
bulbospongiosus m. which expels semen though spongy urethra
After ejaculation, which stream (haha) of nerves [para/symp] function on the tunica media in the deep a.?
sympathetics cause constriction of tunica media to decrease blood flow to the area
