greater sciatic foramen การใช้

• The inferior gluteal nerve leaves the pelvis through the greater sciatic foramen and runs underneath the piriformis muscle.
• However, most of the sacral plexus nerves are scarcely recognizable, because they leave the pelvis through the greater sciatic foramen.
• The pudendal nerve passes between the piriformis muscle and coccygeus ( ischiococcygeus ) muscles and leaves the pelvis through the lower part of the greater sciatic foramen.
• The sciatic nerve ( L4 to S3 ), the largest nerve of the body, immediately leaves the pelvis through the greater sciatic foramen, below the piriformis.
• The superior gluteal nerve passes backward through the greater sciatic foramen, above the piriformis : the inferior gluteal nerve also passes backward through the greater sciatic foramen but below the piriformis ."
• The superior gluteal nerve passes backward through the greater sciatic foramen, above the piriformis : the inferior gluteal nerve also passes backward through the greater sciatic foramen but below the piriformis ."
• The nerves forming the sacral plexus converge toward the lower part of the greater sciatic foramen, and unite to form a flattened band, from the anterior and posterior surfaces of which several branches arise.
• The main body of the inferior gluteal artery leaves the pelvis posteriorly to the upper border of the sacrospinous ligament, to follow the inferior portion of the sciatic nerve out of the greater sciatic foramen.
• It leaves the pelvis through the greater sciatic foramen below the piriformis muscle, and gives off the branch to the gemellus superior, which enters the upper part of the posterior surface of the muscle.
• It arises partly from the dorsal divisions of the first and second, and from the ventral divisions of the second and third sacral nerves, and issues from the pelvis through the greater sciatic foramen below the piriformis muscle.
• It passes down on the sacral plexus of nerves and the piriformis muscle, behind the internal pudendal artery, to the lower part of the greater sciatic foramen, through which it escapes from the pelvis between the piriformis and coccygeus.
• The muscle passes out of the pelvis through the greater sciatic foramen, the upper part of which it fills, and is inserted by a rounded tendon into the upper border of the greater trochanter behind, but often partly blended with, the common tendon of the obturator internus and superior and inferior gemellus muscles.
• It arises from the front of the sacrum by three fleshy digitations, attached to the portions of bone between the first, second, third, and fourth anterior sacral foramina, and to the grooves leading from the foramina : a few fibers also arise from the margin of the greater sciatic foramen, and from the anterior surface of the sacrotuberous ligament.