_1_, Urinary bladder; _2_, ureter; _3_, vas deferens; _4_, prostate;
_5_, urethral muscle; _6_, bulb of urethra; _a_, abdominal wall;
_b_, ilium; _c_, ischium. (After Ellenberger, in Leisering’s Atlas.)
]
The pelvic part of the =urethra= is relatively long. Its first part is
inclosed in the prostate.[148] At the ischial arch the urethra has a
well-developed bilobed =bulb=, formed by an enlargement here of the
corpus spongiosum. It is covered by the strong but short
bulbo-cavernosus muscle. The other erectile bodies have been described.
The =urethral= (Wilson’s) =muscle= is very strong; it encircles the
urethra and has a median raphé dorsally.