Answer :
To put it simply, the intrinsic hand muscles are divided anatomically into the Thenar group, which is located at the base of the thumb, the Hypothenar Group, which is situated at the base of the small finger, and everyone in between .
The intrinsic hand is made up of four muscular groups. These are the lumbrical, interossei, thenar, and hypothenar muscles. The intrinsic muscles, including the lumbricals & interosseus muscles, balance finger movement during normal hand function and produce this broad sweeping motion. They are also in charge of connecting the extension of the interphalangeal joints (IP) with the flexion of the metacarpophalangeal joint (MCP). The carpal & metacarpal bones serve as the origin & insertion points for the intrinsic hand muscles. The forearm is frequently the origin of the extrinsic hand muscles, which enter into hand . The majority of the hand's intrinsic muscles, including all seven interossei, three hypothenar muscle fibres, the adductor hanced, the deep heads of the FPB, and the two flexors longus, are innervated by the ulnar nerve.
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