. Cunningham's Text-book of anatomy. Anatomy. THE MUSCLES OF THE BUTTOCK. 417 medius, by fleshy fibres from the dorsum ilii between the anterior and inferior gluteal lines (Fig. 369, p. 415). This muscle is fan-shaped and its fibres converge to the antero-superior angle of the greater tro- chanter, to be inserted into the anterior sur- face of the trochanter, and sometimes also into the front part of the superior border (Figs. 361, p. 407, and 373). It is also inserted into the cap- sule of the hip-joint. A bursa is placed beneath the tendon in front of the greater trochanter. Pudendal nerve N
. Cunningham's Text-book of anatomy. Anatomy. THE MUSCLES OF THE BUTTOCK. 417 medius, by fleshy fibres from the dorsum ilii between the anterior and inferior gluteal lines (Fig. 369, p. 415). This muscle is fan-shaped and its fibres converge to the antero-superior angle of the greater tro- chanter, to be inserted into the anterior sur- face of the trochanter, and sometimes also into the front part of the superior border (Figs. 361, p. 407, and 373). It is also inserted into the cap- sule of the hip-joint. A bursa is placed beneath the tendon in front of the greater trochanter. Pudendal nerve Nerve to obturator interims Gracilis Adductor magnus Hamstring muscles (biceps). 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
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