. Applied anatomy and kinesiology. lecurves around the inner side of the thigh, passing behind the innercondyle and then forward to its insertion. The fascia of the thigh is a thick sheet of fibrous connectivetissue that envelops the thigh just under the skin. Action.—^The position of the sartorius, curving around the frontand inner sides of the thigh, makes it difficult to learn much of itsaction by a study of the skeleton. Its isolated action, under theinfluence of electricity, flexes both the hip and the knee, as onewould expect from its general position. It is not difficult to observe RECT
. Applied anatomy and kinesiology. lecurves around the inner side of the thigh, passing behind the innercondyle and then forward to its insertion. The fascia of the thigh is a thick sheet of fibrous connectivetissue that envelops the thigh just under the skin. Action.—^The position of the sartorius, curving around the frontand inner sides of the thigh, makes it difficult to learn much of itsaction by a study of the skeleton. Its isolated action, under theinfluence of electricity, flexes both the hip and the knee, as onewould expect from its general position. It is not difficult to observe RECTUS FEMORIS 143 the action of the sartorius on the Uving body, although its appear-ance in action is unusual, as it draws down into the mass of musclebeneath it when it contracts, forming a deep furrow down the insideof the thigh. It also pulls up on the fascia and the skin, forming aset of wrinkles for a distance of 2 or 3 inches below the acts in walking, running, and all movements combining flexionof the hip and Fig. 85.—Muscles of the hip in action: S, sartorius; R, rectus femoris; G, gluteusmaximus; g, gluteus medius; V, vastus externus. RECTUS FEMORIS. This large muscle, named from its position straight down thefront of the thigh, corresponds closely to the long head of the tri-ceps on the arm, being the middle part of a three-headed extensor. Origin.—^The antero-inferior spine of the ilium, between its tipand the hip-joint. Insertion.—The upper border of the patella. Structure.—The upper tendon passes do^vn the middle of themuscle and the flattened lower tendon passes up beneath its deeper 144 MOVEMENTS OF THE HIP-JOINT surface; the muscle fibers cross obliquely from one tendon to theother. Action.—A cord looped around the patella and the free endheld against the ilium just in front of the hip-joint shows thedirection of pull; plain tendency to flex the hip, but a very shortpower arm and a pull nearly in line with the femur, favorable forspeed
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