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Extensors are muscles that produce extension, a movement that increases the angle between two bones or body surfaces at a joint. Learn about the extensors of the upper and lower limbs, and see their anatomical names and locations.
extensor muscle, any of the muscles that increase the angle between members of a limb, as by straightening the elbow or knee or bending the wrist or spine backward. The movement is usually directed backward, with the notable exception of the knee joint. In humans, certain muscles of the hand and foot are named for this function. In the hand these include the extensor carpi radialis brevis ...
For example, the biceps are a well-known flexor muscle that contracts to bend the elbow, while the triceps are extensor muscles that work to straighten the elbow. 5. Flexors often work in opposition to extensors, maintaining balance and control of movements; on the other hand, extensors provide the necessary force to open or extend joints. ...
Learn about the structure, insertions and function of the extensor expansion of the hand, a triangular connective tissue formed by the extensor tendons. Find out how injury to the central slip can cause the Boutonniere Deformity.
The extensor digiti minimi is thought to originate from the extensor digitorum muscle. In some people, these two muscles are fused together. It lies medially to the extensor digitorum. Attachments: Originates from the lateral epicondyle of the humerus. It attaches, with the extensor digitorum tendon, into the extensor hood of the little finger.
Extensor pollicis longus originates from the middle third of the posterior surface of ulna, mostly along its radial border.This attachment extends onto the adjacent interosseous membrane, and is situated proximal to the origin of extensor indicis muscle.From here, the muscle belly runs obliquely in a radial direction, towards the lateral aspect of the wrist joint.
M. extensor digitorum communis: This muscle arises from the lateral epicondyle of the humerus and inserts by means of five tendons into the distal phalanges of each digit. • M. extensor digiti minimi (can be considered as the m. extensor digitorum lateralis): This muscle arises immediately caudal to the origin of the common extensor of the ...
Learn about extensor muscle, a type of muscle that increases the angle between the members of a limb, such as the hand, foot and hip. Find out the structure, origin, insertion and nerve supply of different extensor muscles in humans.
Extensor is a muscle that extends or straightens a limb or body part. Learn the anatomy, function, and antagonist of extensor muscles from various medical sources and dictionaries.
The wrist extensor muscles comprise a significant component of the posterior forearm musculature. These muscles generally originate on or near the lateral epicondyle and insert on the distal forearm or in the hand. Clinical pathology affecting one or multiple muscles in this group is not uncommon. For example, lateral epicondylitis affects 1-5% of the general population.[1][2]