midbrain {Ans: The part of the brain that is responsible for helping to regulate the level of consciousness.}posterior {Ans: In anatomy, the back surface of the body; the side away from you in the standard anatomic position.}radius {Ans: The bone on the thumb side of the forearm.}femoral head {Ans: The proximal end of the femur, articulating with the acetabulum to form the hip joint.}skeletal muscle {Ans: Muscle that is attached to bones and usually crosses at least one joint; striated, or voluntary, muscle.}flex {Ans: To bend.}