Assertion: fibula's head | /r/CapableOf | act on two joints
Facets:
Source sentences:
text: The biceps femoris has two heads: The long head has its origin on the ischial tuberosity together with the semitendinosus and acts on two joints.
text: The short head originates from the middle third of the linea aspera on the shaft of the femur and the lateral intermuscular septum of thigh, and acts on only one joint.