Tunica albuginea (penis)

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Tunica albuginea (penis)
Gray1155.png
Transverse section of the penis.
Penis cross section.svg
The penis in transverse section with tunica albuginea shown.
Details
Identifiers
Latintunica albuginea corporum cavernosorum, tunica albuginea corporis spongiosi
TAA09.4.01.017
A09.4.01.018
FMA19630
Anatomical terminology
Tunica albuginea (penis)
2004 05 01 Local Anes Fig2 Anatomy of the Human Penis The Relationship of the Architecture between Skeletal and Smooth Muscle.jpg
Anatomy of the tunica albuginea.
2013 09 10 CC Fig2 Self Composed.jpg
Muscular architecture of the tunica albuginea.
Details
Identifiers
Latintunica albuginea corporum cavernosorum, tunica albuginea corporis spongiosi
TAA09.4.01.017
A09.4.01.018
FMA19630
Anatomical terminology

The tunica albuginea is the fibrous envelope of the corpora cavernosa penis. It consists of approximately 5% elastin, an extensible tissue that is primarily made up of the amino acids glycine, valine, alanine, and proline. The majority of the remaining tissue is collagen, which is made up of lysine, proline, glycine, alanine, and other amino acids.[1] It is a bi-layered structure that includes an outer longitudinal layer and an inner circular layer.

The tunica albuginea is directly involved in maintaining an erection; that is due to Buck's fascia constricting the erection veins of the penis, preventing blood from leaving and thus sustaining the erect state. The erection veins include the deep dorsal vein, two cavernosal veins, and four para-arterial veins.

The trabeculae of the tunica albuginea are more delicate, nearly uniform in size, and the meshes between them smaller than in the corpora cavernosa penis: their long diameters, for the most part, corresponding with that of the penis.

The external envelope or outer coat of the corpus spongiosum is formed partly of unstriped muscular fibers, and a layer of the same tissue immediately surrounds the canal of the urethra.

Additional images[edit]

References[edit]

This article incorporates text in the public domain from page 1250 of the 20th edition of Gray's Anatomy (1918)

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