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Tunica Albuginea of Testis (Medial Part; Left)
Urogenital System

Tunica Albuginea of Testis (Medial Part; Left)

Tunica albuginea testis

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Structure/Morphology

The tunica albuginea is the intermediate layer of three layers that surround the testis. It is composed of bundles of dense white collagen fibers.

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Key Features/ Anatomical Relations

The tunica albuginea becomes slightly thickened posteriorly as the mediastinum of the testis. Blood vessels, lymphatics, and genital ducts enter and leave the testis at the mediastinum.

Function

The presence of contractile cells within the tunica albuginea suggests that it is involved in:

—the transport of spermatozoa (immature sperm cells) from the testis to the epididymis;

—the maintenance of interstitial pressure in the testis;

—the maintenance of blood flow through the testis (Middendorff et al., 2002).

References

Middendorff R, Muller D, Mewe M, Mukhopadhyay AK, Holstein AF, Davidoff MS. The tunica albuginea of the human testis is characterized by complex contraction and relaxation activities regulated by cyclic GMP. J Clin Endocrinol Metab. 2002;87(7):3486-99.

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Tunica Albuginea

ScienceDirect image

Tunica albuginea is the tough fibrous layer of connective tissue that surrounds the corpora cavernosa of the penis.

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