What makes up the obturator membrane?
It is covered by thin fibrous membrane, the obturator membrane, which is covered on the internal and external surfaces by the muscles obturator internus and obturator externus respectively.
Where is the obturator membrane?
The membrane is attached to the sharp margin of the obturator foramen except at its lower lateral angle, where it is fixed to the pelvic surface of the inferior ramus of the ischium, i. e., within the margin. Both obturator muscles are connected with this membrane.
What muscles attach to obturator membrane?
The obturator nerve emerges from the medial side of the psoas muscle, crosses the lesser pelvis, and passes through the obturator foramen into the medial thigh, innervating the adductor longus, brevis, and magnus; gracilis; obturator externus; and pectineus muscles, whose action is to adduct the thigh.
What does the obturator muscle do?
The obturator internus (OI) is a hip muscle that originates deep within the pelvis, wraps out and inserts on the posterior aspect of the head of the femur (the thigh bone). The OI’s main function is to rotate the leg externally and has a major role in stabilizing the head of the femur into the hip socket.
What is the significance of obturator foramen?
Anatomical terms of bone The obturator foramen (Latin foramen obturatum) is the large opening created by the ischium and pubis bones of the pelvis through which nerves and blood vessels pass.
What structures pass through obturator foramen?
Background: The structures passing through the obturator foramen are usually arranged as follows from above downwards – Obturator nerve, obturator artery and obturator vein. But there can be a change in this pattern which is very important for the pelvic surgeons.
What makes the obturator canal?
The obturator canal is formed between the obturator membrane and the pelvis. The obturator artery, obturator vein, and obturator nerve all travel through the canal.
What passes through the obturator foramen?
Through the canal the obturator artery, obturator vein and obturator nerve pass out of the pelvis.
What nerve passes through the obturator canal?
The obturator nerve is derived from L2-4 and travels along the medial border of the psoas muscle; it is both a motor and a sensory nerve. It travels through the obturator foramen with the obturator artery and vein into the thigh. The obturator nerve divides into anterior and posterior branches.
What does the obturator nerve do?
The obturator nerve (L2–L4) supplies the pectineus; adductor (longus, brevis, and magnus); gracilis; and external obturator muscles. This nerve controls adduction and rotation of the thigh. A small cutaneous zone on the internal thigh is supplied by sensory fibers.
What is the main action of the obturator internus?
| Internal obturator muscle | |
|---|---|
| Actions | Abducts & laterally rotates the extended hip and abducts the flexed thigh at the hip, and stabilizes the hip during walking |
| Identifiers | |
| Latin | Musculus obturatorius internus |
| TA98 | A04.7.02.012 |