Pronator
Pronator
Pronator (/proʊˈneɪtər/) is a term used in anatomy to describe muscles that produce the motion of pronation. Pronation is the rotation of the hand and forearm so that the palm faces downwards or backwards.
Etymology
The term "pronator" is derived from the Latin word "pronatus," which means "bent forward" or "inclined."
Types of Pronator Muscles
There are two main pronator muscles in the human body:
1. Pronator Teres: This muscle originates from the medial epicondyle of the humerus and inserts into the middle of the lateral surface of the radius. It acts to pronate and flex the forearm at the elbow.
2. Pronator Quadratus: This muscle is a square-shaped muscle on the distal forearm that also acts to pronate the forearm. It originates from the distal portion of the anterior ulna and inserts into the distal portion of the anterior radius.
Related Terms
- Supinator: This is the opposing muscle group to the pronators. The supinator muscle is responsible for the opposite motion, supination, which turns the palm upwards or forwards.
- Pronation: This is the act of turning the palm downwards or backwards, a motion produced by the pronator muscles.
- Supination: This is the act of turning the palm upwards or forwards, a motion produced by the supinator muscle.
See Also
External links
- Medical encyclopedia article on Pronator
- Wikipedia's article - Pronator
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