skeletal muscle weight biceps femoris muscle weight 2013-01-14T11:35:24Z CMO:0001397 JSmith The weight or the measure of the heaviness of one of the posterior femoral muscles whose long head has origin from the tuberosity of the ischium and whose short head has origin from the lower half of the lateral lip of the linea aspera, with insertion into the head of the fibula, whose action flexes the knee and rotates the leg laterally. clinical_measurement_ontology