Lesser sciatic foramen on:
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The lesser sciatic foramen is an opening (
The following pass through the foramen:
* the tendon of the
foramen
In anatomy and osteology, a foramen (;Entry "foramen"
in
) between the pelvis and the back of the thigh. The foramen is formed by the sacrotuberous ligament which runs between the sacrum and the ischial tuberosity and the sacrospinous ligament which runs between the sacrum and the ischial spine.
in
Structure
The lesser sciatic foramen has the following boundaries: * Anterior: the tuberosity of the ischium * Superior: the spine of the ischium and sacrospinous ligament * Posterior: the sacrotuberous ligament Alternatively, the foramen can be defined by the boundaries of the lesser sciatic notch and the two ligaments.Function
The following pass through the foramen:
* the tendon of the Obturator internus
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 i ...
* internal pudendal vessels
* pudendal nerve
The pudendal nerve is the main nerve of the perineum. It carries sensation from the external genitalia of both sexes and the skin around the anus and perineum, as well as the motor supply to various pelvic muscles, including the male or ...
* nerve to the obturator internus
The nerve to obturator internus, also known as the obturator internus nerve, is a nerve that innervates the obturator internus and gemellus superior muscles.
Structure
The nerve to obturator internus originates in the lumbosacral plexus. It ari ...
See also
* Greater sciatic foramenReferences
External links
* - "The Female Perineum: Osteology" {{Authority control Bones of the pelvis