. Cunningham's Text-book of anatomy. Anatomy. Superior gluteal nerve Gluteus medius (cut) Inferior gluteal nerve Obturator internus and gemelli Obturator externus Quadratus femoris Sciatic nerve (and subdivisions) Posterior cutaneous nerve of thigh. maxim us (insertion) Adductor magnus Fig. 372.—The Muscles and Nerves of the Eight Buttock. The glutseus raaximus is reflected ; and the gluteus medius is cut in part to show the glut sens minimus. Nerve-Supply.— The superior gluteal nerve from the sacral plexus (L. 4. 5. S. 1.). Actions.—The mus- cle is primarily an ab- ductor of the thigh.
. Cunningham's Text-book of anatomy. Anatomy. Superior gluteal nerve Gluteus medius (cut) Inferior gluteal nerve Obturator internus and gemelli Obturator externus Quadratus femoris Sciatic nerve (and subdivisions) Posterior cutaneous nerve of thigh. maxim us (insertion) Adductor magnus Fig. 372.—The Muscles and Nerves of the Eight Buttock. The glutseus raaximus is reflected ; and the gluteus medius is cut in part to show the glut sens minimus. Nerve-Supply.— The superior gluteal nerve from the sacral plexus (L. 4. 5. S. 1.). Actions.—The mus- cle is primarily an ab- ductor of the thigh. Its anterior fibres in addition produce medial rotation and its posterior fibres lateral rotation of the limb. M. Piriformis.— The piriformis is one of the few mus- cles connecting the lower limb to the axial skeleton. It arises (1) within the pelvis from the roots of the vertebral arches of the second, third, and fourth sacral vertebras, and from the adjacent part of the bone lateral to the anterior sacral foramina. Passing out through the greater sciatic foramen, it receives an origin from (2) the upper margin of the __ greater sciatic notch Obturator internus and gemelli (insertion) ,,-sgg BUsss,. of the ilium, and (3) the pelvic surface of the sacro-tuberous ligament. In the buttock it forms a rounded ten- don, which is inserted into a facet on the superior border and medial aspect of the greater trochanter of the femur (Figs. 370, p. 416, and 373). The piriformis, at its origin, lines the posterior wall of the pelvis. In the buttock it is covered by the glutseus maximus, and lies behind the capsule of the hip-joint, between the glutseus medius and superior gemellus. Nerve-Supply.—Branches direct from the anterior rami of the first and second sacral nerves. 28 Gluteus minimus (insertion) Piriformis (insertion). Fig. (insertion) -Muscle-Attachments to the Proximal Aspect of the Greater Trochanter of the Left Please note that these images are extracted from
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