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When the forearm and hand are supinated, the thumbs point away from the body. Pronation of the foot is turning of the sole outwards, so that weight is borne on the medial part of the foot. [33] Supination of the forearm occurs when the forearm or palm are rotated outwards. Supination of the foot is turning of the sole of the foot inwards ...
The brachioradialis is a muscle of the forearm that flexes the forearm at the elbow. [1] [2] It is also capable of both pronation and supination, depending on the position of the forearm. [2] It is attached to the distal styloid process of the radius by way of the brachioradialis tendon, and to the lateral supracondylar ridge of the humerus.
The word pronator comes from the Latin pronus, which means “inclined forward or lying face downward”, and has to do with the muscle's action being pronation of the forearm. The Latin term teres , which means "round or cylindrical shaped" or "long and round", refers to the shape of the muscle.
The function of the radioulnar joint is to lift and maneuver weight load from the distal radioulnar joint to be distributed across the forearm's radius and ulna as a load-bearing joint. [4] Supination of the radioulnar joint can move from 0 degrees neutral to approximately 80-90 degrees where pronation of the radioulnar joint can move from 0 ...
It is the most active muscle in forearm supination during unresisted supination, while biceps becomes increasingly active with heavy loading. [8] Supination strength decreases by 64% if supinator is disabled by, for example, injury.
Pronation is a normal, desirable, and necessary component of the gait cycle. [4] Pronation is the first half of the stance phase, whereas supination starts the propulsive phase as the heel begins to lift off the ground. [5] An illustration of pronation and supination of the foot from an anatomy textbook
Pivot joints allow for rotation, which can be external (for example when rotating an arm outward), or internal (as in rotating an arm inward).When rotating the forearm, these movements are typically called pronation and supination.
Brachoradialis is inserted distally on the radius end therefore, unlike the previous two muscles, only acts on the forearm. It brings the forearm into midposition between supination and pronation, and in this position it acts as a flexor. In slow movements and in the supinated forearm it has a minimal flexor action.