dartos muliebris

dar·tos mu·li·e·b'ris

a very thin layer of smooth muscle in the integument of the labia majora; less well-developed than the tunica dartos of the scrotum.

dartos muliebris

(moo-lē′ĕ-brĭs)
A veil-like smooth muscle just under the skin of the labia majora.