. Applied anatomy and kinesiology. Insertion.—^The linea aspera in the middle third of the thigh. Structure.—A thick triangular muscle, arising by a short tendonand diverging fanwise to its wide insertion. Action.—The pull of the adductor longus is similar to that ofthe pectineus but it is plainly in a position to adduct more andflex less than the latter muscle. Isolated action of the adductorlongus is a combination of flexion and adduction, but it does notflex enough to lift the thigh over the other one while sitting, asthe pectineus does. ADDUCTOR BREVIS. A short muscle beneath the adductor
. Applied anatomy and kinesiology. Insertion.—^The linea aspera in the middle third of the thigh. Structure.—A thick triangular muscle, arising by a short tendonand diverging fanwise to its wide insertion. Action.—The pull of the adductor longus is similar to that ofthe pectineus but it is plainly in a position to adduct more andflex less than the latter muscle. Isolated action of the adductorlongus is a combination of flexion and adduction, but it does notflex enough to lift the thigh over the other one while sitting, asthe pectineus does. ADDUCTOR BREVIS. A short muscle beneath the adductor —^The front of the pubes, just below the —^The upper half of the linea —A fan-shaped sheet similar to the longus but —^The position of the brevis gives less power to flex thehip and better angle of pull for adduction. ADDUCTOR MAGNUS 153 ADDUCTOR MAGNUS. One of the largest muscles of the body, situated beneath thegracilis on the inner side of the Fig. 90.—Front view of the adductors brevis and magnus. (Gerrish.) Origin.—^The front of the pubes, the tuberosity of the ischium,and the whole length of the ramus connecting the two. Insertion.—The whole length of the linea aspera and the innercondyloid line. 154 MOVEMENTS OF THE HIP-JOINT Structure.—The fibers from the piibes pass horizontally acrossto the femur, much like those of the brevis; those from the ramuslower oil the linea aspera; those from the tuberosity of the ischiumgo to the lower end of the condyloid line. Action.—^The upper half of the magnus works under the sameconditions as the longus and brevis except that the origin fartherback causes less tendency to flex the hip; the lowest fibers havealmost the same pull as the semitendinosus. Stimulation of thewhole muscle gives rise to adduction; the upper fibers give somerotation outward; the lower fibers, extension and rotation inward. Loss of the adductors causes some difficulty
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