Corpus spongiosum penis


Corpus spongiosum penis
Corpus spongiosum penis
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Transverse section of the penis.
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The constituent cavernous cylinders of the penis.
Gray's subject #262 1248

Corpus spongiosum (Plural: Corpora Spongiosa) (also known as corpus cavernosum urethrae in older texts) is the mass of spongy tissue surrounding the male urethra within the penis. Although called corpus cavernosum in older texts, this is not correct.

Contents

Anatomy

Behind, it is expanded to form the urethral bulb, and lies in apposition with the inferior 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 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, also known as the meatus.

The circumference of the base of the glans forms a rounded projecting border, the corona glandis, overhanging a deep retroglandular sulcus (Meiring's sulcus), behind which is the neck of the penis.

Function

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.

See also

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

Additional images

External links


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Look at other dictionaries:

  • Corpus spongiosum penis — Ein Schwellkörper ist ein sich mit Blut füllendes und dadurch physiologische Aufgaben erfüllendes Gefäßgeflecht. Inhaltsverzeichnis 1 Schwellkörper des Penis 1.1 Corpus cavernosum penis 1.2 Corpus spongiosum penis 1.3 C …   Deutsch Wikipedia

  • Corpus spongiosum penis — varpos kempinkūnis statusas T sritis gyvūnų anatomija, gyvūnų morfologija atitikmenys: lot. Corpus spongiosum penis ryšiai: platesnis terminas – varpa …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • corpus spongiosum penis — [TA] spongy body of penis: the column of erectile tissue that forms the urethral surface of the penis, and in which the urethra is found; its distal expansion forms the glans penis. Called also spongy body of male urethra …   Medical dictionary

  • Corpus cavernosum penis — Ein Schwellkörper ist ein sich mit Blut füllendes und dadurch physiologische Aufgaben erfüllendes Gefäßgeflecht. Inhaltsverzeichnis 1 Schwellkörper des Penis 1.1 Corpus cavernosum penis 1.2 Corpus spongiosum penis 1.3 C …   Deutsch Wikipedia

  • Corpus cavernosum penis — Transverse section of the penis. The constituent cavernous cylinders o …   Wikipedia

  • Corpus spongiosum glandis — Ein Schwellkörper ist ein sich mit Blut füllendes und dadurch physiologische Aufgaben erfüllendes Gefäßgeflecht. Inhaltsverzeichnis 1 Schwellkörper des Penis 1.1 Corpus cavernosum penis 1.2 Corpus spongiosum penis 1.3 C …   Deutsch Wikipedia

  • corpus spongiosum — corpus spon·gi·o·sum .spən jē ō səm, .spän n the median longitudinal column of erectile tissue of the penis that contains the urethra and is ventral to the two corpora cavernosa * * * the blood sinus that surrounds the urethra of the male.… …   Medical dictionary

  • corpus spongiosum — [ˌspʌndʒɪ əʊsəm] noun (plural corpora spongiosa sə) Anatomy a mass of erectile tissue alongside the corpora cavernosa of the penis and terminating in the glans. Origin from corpus and L. spongiosum, neut. of spongiosus porous …   English new terms dictionary

  • corpus spongiosum — the blood sinus that surrounds the urethra of the male. Together with the corpora cavernosa, it forms the erectile tissue of the penis. It is expanded at the base of the penis to form the urethral bulb and at the tip to form the glans penis …   The new mediacal dictionary

  • corpus spongiosum — ˌspənjēˈōsəm, ˌspän noun Etymology: New Latin, literally, spongy body : the median longitudinal column of erectile tissue of the penis that contains the urethra and is ventral to the two corpora cavernosa …   Useful english dictionary


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