Dartos
Hip & Pelvis
Wrinkles scrotal skin in cold temperatures to reduce surface area and retain heat — why the scrotum looks dramatically different in a cold pool vs. a warm shower.
Function
Wrinkles skin; assists thermoregulation
Origin
Subcutaneous smooth muscle of scrotum/labia majora
Insertion
Skin/fascia of scrotum/labia majora
Innervation
Sympathetic autonomic fibers