The Male Reproductive Tract
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This is the caudal end of the dog, and dorsal is to the right of the image.
As the urethra exits the pelvis, it becomes surrounded by bodies of cavernous tissue, which are initially surrounded by muscle. The urethralis muscle becomes the bulbospongiosus muscle (A) as it surrounds the bulbs of the penis and corpus spongiosum; The ischiocavernosus muscle (B) arises from the ischium and surrounds the crus and corpus cavernosum; Finally, there is a pair of thin strap muscles which course along the caudoventral surface of the penis, the retractor penis muscles (C).