KINS 1224 Chapter Notes - Chapter 27: Prostatic Urethra, Vas Deferens, Ejaculatory Duct
26 Apr 2016
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Each internal iliac artery gives rise to an internal pudendal (penile) artery which enters the root of the penis and divides into two. One branch the dorsal artery supplies blood to the skin, fascia, and corpus spongiosum. The other branch the deep artery travels through the core of the corpus cavernous and gives off smaller helicine arteries which penetrate the trabeculae and empty into the lacunae. When the penis is flaccid most of the blood supply comes from the dorsal arteries. When the deep artery dilates the lacunae fill with blood and the penis becomes erect. A deep dorsal vein drains the blood from the penis. The penis is richly innervated by sensory and motor nerve fibers. The glans has an abundance of tactile, pressure, and temperature receptors. There is a pair of proximal dorsal nerves to the internal pudendal nerves going up the sacral to the spinal cord.
