Which statement about the parasympathetic nervous system is true?
A. Parasympathetic nerves stimulate contraction of smooth muscle in the walls of the epididymis and ductus deferens during emission.
B. Fibers arising in the sacral division cause dilation of penile blood vessels and engorgement of erectile tissue.
C. Parasympathetic nerves initiate erection in response to visual stimuli and sexual thoughts.
D. Parasympathetic nerves constrict the penile arteries when the penis is directly stimulated.
E. Parasympathetic fibers arise from T12 to L2 and pass through the hypogastric and pelvic nerve plexuses.
Answer: B
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