dartos fascia is a fat-free layer of smooth muscular fiber outside the external spermatic fascia but below the skin. It is a continuation of Scarpa's fascia, which is a membranous layer of the subcutaneous tissue in the abdominal wall. The wrinkled (rugose) appearance of the scrotum is due to this layer of fascia. [1 ]
Sex differences [ edit ]
Function [ edit ]
The tunica dartos acts to regulate the
temperature of the testicles, which promotes spermatogenesis. It does this by expanding or contracting to wrinkle the scrotal skin.
Contraction reduces the
surface area available for heat loss, thus reducing heat loss and warming the testicles.
Conversely, expansion increases the surface area, promoting heat loss and thus cooling the testicles.
The dartos muscle works in conjunction with the
cremaster muscle to elevate the testis but should not be confused with the cremasteric reflex.
Related terms [ edit ]
Some dartos-related terms:
dartoic (dar·to·ic) (dahr-to'ik) of the nature of a dartos; having a slow, involuntary contractility like that of the dartos.
dartoid (dar·toid) (dahr'toid) resembling the dartos.
Additional images [ edit ]
Transverse section through the left side of the scrotum and the left testis.
References [ edit ]
^ Agur, Keith L. Moore, Arthur F. Dalley, Anne M.R. (2010). Clinically oriented anatomy (6th ed. ed.). Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. ISBN 978-07817-7525-0.
External links [ edit ]