Daily Movement

When I cook breakfast in the morning, I turn the knob on the stove to turn it on.  When I reach for the stove, my elbow flexes at first at the same time my shoulder flexes. Then my elbow extends and as I grab the knob, my arm pronates from the neutral position to turn the knob. My arm is then returned to the starting position. Both flexion and extension occur in the sagittal plane and the frontal axis of rotation. Pronation of the arm happens in the transverse plane around a the vertical axis. Considering the osteokinematics of the elbow, it does from flexion to extension in an open kinematic chain. The arthrokinematics of the elbow in this movement would be the radius and ulna gliding on the humerous head while it rolls in the opposite direction.  Shoulder flexion would primarily use the deltoid muscle.  The prime movers for elbow flexion would be the biceps brachii, brachioradialis and brachialis.  When the elbow extends, the triceps would be the prime mover. The pronator teres and pronator quadratus would be the prime movers for pronation of the arm. All of these would be concentric actions.