94A Kinesiology Practice Exam

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Which muscle flexes the tibiofemoral joint and extends the coxal joint, originating from the ischial tuberosity and lateral lip of the linea aspera and inserting on the head of the fibula?

Rectus femoris

Biceps femoris

The muscle described is the one with dual heads forming the hamstrings: it flexes the knee (tibiofemoral joint) and extends the hip (coxal joint). Its long head originates from the ischial tuberosity and its short head from the lateral lip of the linea aspera, and both heads insert on the head of the fibula. This exact set of attachments and action fits the biceps femoris, making it the correct choice. The other muscles either don’t attach to the fibular head or don’t extend the hip in this same way, so they don’t match the description as precisely.

Semitendinosus

Sartorius