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The internal obturator muscle or obturator internus muscle originates on the medial surface of the obturator membrane, the ischium near the membrane, and the rim of the pubis. It exits the pelvic cavity through the lesser sciatic foramen. The internal obturator is situated partly within the lesser pelvis, and partly at the back of the hip-joint.
The pelvic fasciae are the fascia of the pelvis and can be divided into: (a) the fascial sheaths of the obturator internus muscle (fascia of the obturator internus) the piriformis muscle (fascia of the piriformis) the pelvic floor (b) fascia associated with the organs of the pelvis.
The internal pudendal vessels and pudendal nerve cross the pelvic surface of the internal obturator and are enclosed in a special canal—Alcock's canal—formed by the obturator fascia. The iliococcygeus portion of the levator ani attaches to the lateral walls of the pelvis via the obturator fascia through the tendinous arch of the obturator ...
The pudendal canal (also called Alcock's canal) is an anatomical structure formed by the obturator fascia (fascia of the obturator internus muscle) lining the lateral wall of the ischioanal fossa. The internal pudendal artery and veins, and pudendal nerve pass through the pudendal canal, and the perineal nerve arises within it. [1]
The space is located in the pelvic region and is bounded by the following structures: [1] Anteriorly: Symphysis pubis; Laterally: Pubic rami and obturator internus muscles; Posteriorly: Urinary bladder; Floor: Anterior vagina (in women) and proximal urethra
The pelvic floor muscles are located between the tailbone and the pubic bone within the pelvis. In females, they support the uterus and vagina, as well as the bowel and bladder.
The ischioanal fossa (formerly called ischiorectal fossa) is the fat-filled wedge-shaped space located lateral to the anal canal and inferior to the pelvic diaphragm.It is somewhat prismatic in shape, with its base directed to the surface of the perineum and its apex at the line of meeting of the obturator and anal fasciae.
It forms the inferior border of the obturator foramen and serves as part of the origin for the obturator internus and externus muscles. Also, most adductors originate at the ischiopubic ramus. The fascia of Colles is on attached to its margin.