For their anterior three-fourths the

corpora cavernosa penis A corpus cavernosum penis (singular) (literally "cave-like body" of the penis, plural corpora cavernosa) is one of a pair of sponge-like regions of erectile tissue, which contain most of the blood in the penis during an erection. Such a corpus ...

lie in intimate apposition with one another, but behind they diverge in the form of two tapering processes, known as the crura, which are firmly connected to the ischial rami. Traced from behind forward, each crus begins by a blunt-pointed process in front of the

tuberosity of the ischium The ischial tuberosity (or tuberosity of the ischium, tuber ischiadicum), also known colloquially as the sit bones or sitz bones, or as a pair the sitting bones, is a large swelling posteriorly on the superior ramus of the ischium. It marks th ...

, along the perineal surface of the conjoined (ischiopubic) ramus. Just before it meets its fellow it presents a slight enlargement, named by

Georg Ludwig Kobelt Georg Ludwig Kobelt (March 12, 1804 in Kehl – May 18, 1857) was a German anatomist. He studied medicine at the University of Heidelberg, where he was a student of Friedrich Tiedemann (1781–1861). He received his medical doctorate in 1833, ...

(1804–1857) the

bulb of the corpus cavernosum penis Just before each crus of the penis meets its fellow, it presents a slight enlargement, which Georg Ludwig Kobelt named the bulb of the corpus cavernosum penis. The bulb of penis is also known as the urethral bulb. The bulb is homologous to the ...

. Beyond this point the crus undergoes a constriction and merges into the corpus cavernosum proper, which retains a uniform diameter to its anterior end.

Additional images

File:Gray1142.png, Male urethra.

References

{{Authority control Mammal male reproductive system Human penis anatomy