Tunica albuginea (penis)

The tunica albuginea is the fibrous envelope that extends the length of the corpus cavernosum penis and corpus spongiosum penis. It is a bi-layered structure that includes an outer longitudinal layer and an inner circular layer.^[1]

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.^{[citation needed ]}

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.^{[citation needed ]}

It consists of approximately 5% elastin, with the remainder mostly consisting of collagen.^[2]

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.^{[clarification needed ][citation needed ]}

• Medical ultrasonography of a normal penis
  Medical ultrasonography of a normal penis

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

• Anatomy photo:42:07-0103 at the SUNY Downstate Medical Center - "The Male Perineum and the Penis: The Corpus Spongiosum and Corpora Cavernosa"
• Image at downstate.edu
• Image at downstate.edu
• Histology image: 17703loa – Histology Learning System at Boston University
• Encyclopedia of Reproduction

• Wikipedia articles incorporating text from the 20th edition of Gray's Anatomy (1918)
• Mammal male reproductive system
• Human penis anatomy

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