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| Corpus spongiosum penis | |
|---|---|
 Cross section of the penis | |
 Lower parts of the genital and urinary tracts in the male | |
| Details | |
| Part of | Penis |
| Identifiers | |
| Latin | corpus spongiosum penis corpus cavernosum urethrae |
| TA98 | A09.4.01.015 |
| TA2 | 3681 |
| FMA | 19617 |
| Anatomical terminology | |
Thecorpus spongiosum is the mass of spongytissue surrounding the maleurethra within thepenis.[1] It is also called thecorpus cavernosum urethrae in older texts.
The proximal part of the corpus spongiosum is expanded to form theurethral bulb, and lies in apposition with theinferior fascia of the urogenital diaphragm, from which it receives a fibrous investment.
The urethra enters the bulb nearer to the superior than to the inferior surface. On the latter there is a median sulcus (groove), from which a thin fibrous septum (wall) 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 theglans penis, is moulded on the rounded ends of thecorpus cavernosum penis, extending farther on their upper than on their lower surfaces.
At the summit of the glans is the slit-like vertical opening known as the external urethral orifice, or theurinary meatus.
The circumference of the base of the glans forms a rounded projecting border, thecorona of glans penis, 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 cavernosa penis become engorged with blood.
This article incorporates text in thepublic domain frompage 1248 of the 20th edition ofGray's Anatomy(1918)
