Biomechanics Activity Analysis pouring a glass of milk

In this activity analysis I will explain to you my daily routine of pouring a cup of milk. My starting position is in front of the counter with a cup and a gallon of milk in front of me. My left elbow goes into flexion due to a concentric contraction of by biceps brachii muscle in the sagittal plane about a frontal axis. My next movement is slight shoulder flexion and finger flexion in digits 2-5 to reach and grasp the handle on the gallon of milk. My next movement is increased elbow flexion and forearm pronation, which occurs in the transverse plane about a longitudinal/vertical axis, to pour the milk from the gallon jug into the cup. After the desired amount is poured, I slowly supinate my left forearm and slightly extend my elbow to place the milk back on the counter. The osteokinematics of the left elbow are extension to flexion in an open kinematic chain. From an arthokinematics standpoint, the moving of the radius and ulna on the humerus (humeroradial joint) is in a spinning motion. The proximal concave head of the radius spins around the distal convex head of the humerus during pronation. The prime mover for the elbow flexion is the concentric contraction of the biceps brachii muscle. I hope this can help you pour a big glass of milk in the mornings!