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Palmaris brevis muscle tenses the skin of the palm on the ulnar side during a grip action. [2][3] It also deepens the hollow of the palm. [5] The palmaris brevis may protect the ulnar nerve and ulnar artery from compressive forces during repetitive grasping actions. [6] The muscle has a fatigue-resistant fiber type profile, which supports the ...
Structure. The abductor pollicis brevis is a flat, thin muscle located just under the skin. It is a thenar muscle, and therefore contributes to the bulk of the palm's thenar eminence. It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from the tubercle of the trapezium.
The muscles of the hand are the skeletal muscles responsible for the movement of the hand and fingers. The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm.
Transverse section across the wrist and digits. (Ext. carp. rad. long. labeled at center left.) The extensor carpi radialis longus is one of the five main muscles that control movements at the wrist. [1] This muscle is quite long, starting on the lateral side of the humerus, and attaching to the base of the second metacarpal bone (metacarpal of ...
Palmar surface. (first lumbricalis labeled at bottom right of muscular group) The lumbricals are intrinsic muscles of the hand that flex the metacarpophalangeal joints, [1] and extend the interphalangeal joints. [1][2] The lumbrical muscles of the foot also have a similar action, though they are of less clinical concern.
The mobile wad (or mobile wad of Henry) is a group of the following three muscles found in the lateral compartment of the forearm: [1] brachioradialis. extensor carpi radialis brevis. extensor carpi radialis longus. It is also sometimes known as the "wad of three", [2] "lateral compartment", [3] or "radial group" [4] of the forearm.
Hypothenar eminence. The mucous sheaths of the tendons on the front of the wrist and digits. (Hypothenar eminence labeled at center right.) Transverse section across the wrist and digits. (Muscles of little finger labeled at upper right.) The hypothenar muscles are a group of three muscles of the palm that control the motion of the little finger.
Palmaris longus is a slender, elongated, spindle shaped muscle, lying on the medial side of the flexor carpi radialis. It is widest in the middle, and narrowest at the proximal and distal attachments. [6] It arises mainly from the medial epicondyle of the humerus via the common flexor tendon. It also takes origin from the adjacent intermuscular ...