. Cunningham's Text-book of anatomy. Anatomy. 416 THE MUSCULAR SYSTEM. Piriformis (insertion) Glutens medius (insertion) ;emelli (insertion) Obturator externus (insertion) Quadratus femoris (insertion) Ilio-psoas (insertion). and the dorsum ilii just lateral to the superior anterior spine, and from the fascia covering its lateral surface (Fig. 369, p. 415). Invested like the gluteus maximus by the fascia lata, it is inserted distal to the level of the us and greater trochanter of the femur into the fascia, which forms the ilio-tibial tract (p. 404). The muscle is placed along the an- terior bo
. Cunningham's Text-book of anatomy. Anatomy. 416 THE MUSCULAR SYSTEM. Piriformis (insertion) Glutens medius (insertion) ;emelli (insertion) Obturator externus (insertion) Quadratus femoris (insertion) Ilio-psoas (insertion). and the dorsum ilii just lateral to the superior anterior spine, and from the fascia covering its lateral surface (Fig. 369, p. 415). Invested like the gluteus maximus by the fascia lata, it is inserted distal to the level of the us and greater trochanter of the femur into the fascia, which forms the ilio-tibial tract (p. 404). The muscle is placed along the an- terior borders of the gluteus medius and gluteus minimus. Gluteus maximus (insertion) Adductor magnus (insertion) Adductor brevis (insertion) Pectineus (insertion) Vastus medialis (origin) Nerve - Supply.—The superior gluteal nerve from, the sacral plexus (L. 4. 5. S. 1.) ends in this muscle after passing between the glutaeus medius and glutaeus minimus. Actions.—It assists in the abduction and rotation of the thigh ; and along with the glutaeus maximus, by its in- sertion into the ilio-tibial tract, it helps to support the knee-joint in the extended position. M. Glutaeus Medius. — The glutaeus medius arises from (1) the dorsum ilii, be- tween the iliac crest and posterior gluteal line above and the anterior gluteal line below (Fig. 369, p. 415), and (2) the strong fascia lata covering its surface anteriorly. It is a fan-shaped muscle, its fibres con- Fig. 370.—Muscle - Attachments to the Posterior Aspect of the proximal part of the Left Femur. LumbO' verging to the greater tro- chanter, to be inserted by a dorsal fascia strong, short tendon into the postero-superior angle of the greater trochanter, and into a well-marked diagonal line on its lateral surface (Fig. 370, and Fig. 372, p. 417). A bursa is placed beneath the tendon at its insertion. The muscle is partly super- ficial, partly concealed by the glutaeus maximus. It covers the gluteus minimus, and the superior gluteal n
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