Tunica Albuginea of Corpora Cavernosa Penis
Tunica albuginea corporum cavernosorum penis
Read moreQuick Facts
The tunica albuginea of corpora cavernosa penis is the dense, white, fibroelastic sheath that encloses the corpora cavernosa penis. Its superficial, longitudinal fibers form a tunic surrounding both corpora, and the deep circularly coursing fibers surround them separately, uniting medially to form the septum of the penis (Dorland, 2011).
Structure and/or Key Feature(s)
A dense fibroelastic coat, the tunica albuginea, surrounds each corpus cavernosum. It has an outer longitudinal layer and an inner circular layer although they are somewhat indistinct and difficult to discern in transverse sections.
Anatomical Relations
The tunica albuginea envelops the corpora cavernosa of the penis. A thin septum of fibrous connective tissue extending from the tunica albuginea, dividing this erectile tissue into two columns. A rich venous plexus of the subalbugineal space is present.
Function
The elastic nature of the tunica albuginea allows blood to flow easily through the dorsal arteries of the penis to initiate an erection. The deep fascia of the penis, which is less elastic, puts pressure on the dorsal vein of the penis near the root to prevent blood from leaving the penis.
References
Dorland, W. (2011) Dorland's Illustrated Medical Dictionary. 32nd edn. Philadelphia, USA: Elsevier Saunders.
