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External Urethral Sphincter

The external urethral sphincter emerges on the ischiopubic ramus and also via the opposite side enters within the intermeshing muscle fibers. It is controlled through the deep perineal section of the pudendal nerve, where action within the nerve fibers contracts the urethra. Structure When around 500 ml

Muscles of the Pelvis

The pelvis comprises of the following muscles: Obturator internus. Piriformis. Levator ani. Coccygeus Obturator internus Majority of the lateral wall of the pelvis is covered by the obturator-internus, which is a thick, fan-shaped muscle. Obturator Internus originates from: Obturator membrane. Margins of the obturator foramen(with the exception of

Coccygeus (Ischiococcygeus)

The coccygeus is a small triangle shaped muscle, which is located behind the levator ani muscle. The two coccygeus muscles extend over the surface of the sacrospinous ligaments and they complete the posterior part of the pelvic diaphragm together. Origin It emerges through the pelvic surface of


Iliacus is a fan-shaped muscle which creates the lateral portion of the iliopsoas muscle. Origin It emerges from: The upper two thirds of the floor of iliac fossa. Inner rim of iliac crest. Upper surface of the lateral part of the sacrum. Insertion The fibres join on

Psoas Minor

Psoas Minor is present in nearly 50% of the population. Whenever existent, it travels downward opposite psoas major. It bears a similarity to the plantaris muscle of the leg in form and shape, and is limited in the abdomen region. Origin It arises from the side of

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