Corpus spongiosum penis
|Corpus spongiosum penis|
|Transverse section of the penis.|
|The constituent cavernous cylinders of the penis.|
|Gray's||subject #262 1248|
The urethra enters the bulb nearer to the upper than to the lower surface. On the latter there is a median sulcus, from which a thin fibrous septum projects into the substance of the bulb and divides it imperfectly into two lateral lobes or hemispheres.
The portion of the corpus spongiosum in front of the bulb lies in a groove on the under surface of the conjoined corpora cavernosa penis. It is cylindrical in form and tapers slightly from behind forward. Its anterior end is expanded in the form of an obtuse cone, flattened from above downward. This expansion, termed the glans penis, is moulded on the rounded ends of the corpora cavernosa penis, extending farther on their upper than on their lower surfaces.
At the summit of the glans is the slit-like vertical external urethral orifice.
The circumference of the base of the glans forms a rounded projecting border, the corona glandis, overhanging a deep retroglandular sulcus, behind which is the neck of the penis.
The function of the corpus spongiosum in erection is to prevent the urethra from pinching closed, thereby maintaining the urethra as a viable channel for ejaculation. To do this, the corpus spongiosum remains pliable during erection while the corpora cavernosum penis becomes engorged with blood.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
Diagram of the arteries of the penis.
- SUNY Labs 44:06-0204 - "The Male Pelvis: The Urethra"
- corpus+spongiosum+penis at eMedicine Dictionary
- corpus+spongiosum+urethrae+muliebris at eMedicine Dictionary