Posted on Jul 27th, 2020 / Published in: Pelvis
The levator ani is a broad muscular sheet situated in the pelvis and is made up of three different muscles: the puborectalis, pubococcygeus, and iliococcygeus. The levator ani and the coccygeus make up the pelvic diaphragm.
Lifter of the ring.
The levator ani is a very important structure in the pelvic and abdomen as it stops the organs from falling out of place and stabilises the entire region.
Puborectalis: Posterior surface of bodies of pubic bones.
Pubococcygeus: Posterior surface of bodies of pubic bones (lateral to puborectalis).
Iliococcygeus: Tendinous arch of internal obturator fascia, Ischial spine.
Puborectalis: None (forms 'puborectal sling' posterior to rectum)
Pubococcygeus: Anococcygeal ligament, coccyx, perineal body and musculature of prostate/vagina.
Iliococcygeus: Anococcygeal ligament, coccyx.
Stability and support of the abdominal and pelvic organs, resistance against increased intra-abdominal pressure, opening and closing of the levator hiatus.
Nerve to levator ani (S4); Pubococcygeus also receives branches via inferior rectal/ perineal branches of Pudendal nerve (S2- S4).
Inferior gluteal, inferior vesical and pudendal arteries.
Evidence shows less shortening of the levator ani muscle during contraction at 37 weeks of gestation is associated with major levator ani muscle defects postpartum.
Siafarikas, F., Staer-Jensen, J., Hilde, G., Bø, K., & Ellström Engh, M. (2015). The levator ani muscle during pregnancy and major levator ani muscle defects diagnosed postpartum: a three- and four-dimensional transperineal ultrasound study. BJOG: an international journal of obstetrics and gynaecology, 122(8), 1083–1091.
Levator ani exercises