When taking a drink, the joint movements that are occurring in the elbow, forearm, wrist, and hand during the ADL are as follows:
– elbow flexion, adduction of the humerus
– forearm pronation, supination of the hand
– ulna and radial deviation, adduction and flexion of the wrist.
The muscles that are working to create these joint movements are:
– biceps brachii; this muscle works to both supinate and pronate at the shoulder joint. It also helps rotate the forearm (palm up) during drinking.
– triceps brachii; this muscle works to laterally deviate through elbow extension and also aids in rotating (palm down) the forearm. It is a short head of three muscles that make up one whole muscle group in your arm.
– anconeus; this muscle works to wrist extension, stopping the hand from going past 180° in pronation.
– extensor carpi radialis longus and brevis; this muscle assists with wrist extension.
– deltoid; this muscle works to flex the elbow and forearm. It helps when bending your fingers by pressing them together (to get a tight grip).