is commonly called the Buck fascia of the penis.

is a bilayered structure enclosing most of the corpora cavernosa but is single layered around the entire corpus spongiosum.

consists of collagen, smooth muscle, and elastic fibers.

extends all the way to the glans penis to give the glans penis a strong covering.

consists of a single layer of strong fibrous tissue, enclosing both the corpora cavernosa and the corpus spongiosum.

is less at the ventral groove of the penis.

is the same throughout the entire penis.

is less in the pendulous portion of the penis.

determines the girth of the penis.

remains the same during both the flaccid and the erect phases of the penis.

It may arise from the obturator artery.

It may be the dominant blood supply to the corpus cavernosum.

It may be damaged during radical prostatectomy.

It is present in just 10% of men.

It may travel anterior to the prostate.

accessory pudendal artery.

external pudendal artery.

cavernous artery.

the dorsal artery.

inferior epigastric artery.

drain exclusively via the dorsal vein of the penis.

drain exclusively via the cavernous vein.

originate in the emissary veins.

originate in the center of the corpus cavernosum

originate in the subtunical venules.

opening of penile arterio-venous shunts.

active constriction of the superficial and deep dorsal veins.

compression of the subtunical venules and emissary veins by the tunica albuginea.

relaxation of the ischiocavernous muscle.

active constriction of emissary veins.

contraction of the smooth muscles within the corpus cavernosum.

arterial dilation and venous constriction.

arterial dilation, venous compression, and sinusoidal relaxation.

filling and expansion of the sinusoidal spaces by nitric oxide.

relaxation of the ischiocavernous muscle.

the dorsal nerve.

the cavernous nerve.

all of the above.

T10-12 and S2-4 spinal segments.

S2-4 spinal segments.

striated muscles.

all of the above.

responsible for the rigid phase of erection.

important in the expulsion of semen during ejaculation.

innervated by the pudendal nerve.

Substantia nigra

A 5-catecholamine cell group and locus ceruleus

Midbrain raphe

Paraventricular area of the hypothalamus

Nucleus paragigantocellularis

nitric oxide.

neuropeptide P.

acetylcholine.

norepinephrine.

prostaglandin E 1.

Titanium sodium and potassium channels

Chloride and calcium channel

Calcium and potassium channels

Sodium and chloride channels

Calcium and phosphate channels

activation of guanylyl cyclase and elevation of cyclic GMP.

activation of phosphodiesterase type 4.

activation of adenylyl cyclase and elevation of cyclic AMP.

closure of potassium channels.

opening of calcium channels resulting in elevated cytosolic calcium levels.

Phosphodiesterase type 3

Neuropeptide P

Acetylcholine

Phosphodiesterase type 5

Nitric oxide

have similar content of the connexin 43 protein in diabetic and healthy rats.

are a communication between the glans penis and the corpora cavernosa.

are a communication between the tunica albuginea and the sinusoid space.

are a communication between intracavernous muscle cells.

are a communication between the corpus cavernosum and corpus spongiosum.