Origin: Inferior rami of the ischium
Insertion: Its fellow of the opposite side
Artery: Pudendal nerve
The Transversus perinaei profundus arises from the inferior rami of the ischium and runs to the median line, where it interlaces in a tendinous raphé with its fellow of the opposite side. It lies in the same plane as the Sphincter urethrae membranaceae; formerly the two muscles were described together as the Constrictor urethrae.
The Transversus perinaei profundus arises from the inferior rami of the ischium and runs across to the side of the vagina. The Sphincter urethrae membranaceae (Constrictor urethrae), like the corresponding muscle on the male, consists of external and internal fibers. The external fibers arise on either side from the margin of the inferior ramus of the pubis. They are directed across the pubic arch in front of the urethra, and pass around it to blend with the muscular fibers of the opposite side, between the urethra and vagina. Theinnermost fibers encircle the lower end of the urethra.