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The palmar interossei, together with the dorsal interossei and the lumbricals, are active components of the finger's extensor mechanism. Fibers from some of the interossei contribute directly to the extensor hoods that wrap around the proximal phalanges, while other fibers may contribute to the central tendon and lateral bands of the mechanism.
The intrinsic muscle groups are the thenar and hypothenar (little finger) muscles; the interossei muscles (four dorsally and three volarly) originating between the metacarpal bones; and the lumbrical muscles arising from the deep flexor (and which are special because they have no bony origin) to insert on the dorsal extensor hood mechanism.
4 Dorsal interossei - Abduct the digits away from the 3rd digit (away from axial line) and are bipennate. 3 Palmar interossei - Adduct the digits towards the 3rd digit (towards the axial line) and are unipennate. This is often remembered by the mnemonic PAD-DAB, as the Palmar interosseous muscles ADduct, and the Dorsal interosseous muscles ...
The muscles of the thumb are nine skeletal muscles located in the hand and forearm. The muscles allow for flexion , extension , adduction , abduction and opposition of the thumb . The muscles acting on the thumb can be divided into two groups: The extrinsic hand muscles, with their muscle bellies located in the forearm, and the intrinsic hand ...
The lumbricals of the hand, extensor indicis muscle, [3] dorsal interossei of the hand, and palmar interossei insert on these bands. A single median band passes down the middle of the finger along the back of the proximal phalanx, inserting into the base of the middle phalanx.
Superficial palmar arch, common palmar digital arteries, deep palmar arch, dorsal digital artery: Nerve: Third and fourth deep branch of ulnar nerve, first and second median nerve: Actions: Flex metacarpophalangeal joints, extend interphalangeal joints: Identifiers; Latin: musculi lumbricales manus: TA98: A04.6.02.065: TA2: 2532: FMA: 37385 ...
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Opposite the metacarpophalangeal articulation each tendon is bound by fasciculi to the collateral ligaments and serves as the dorsal ligament of this joint; after having crossed the joint, it spreads out into a broad aponeurosis, which covers the dorsal surface of the first phalanx and is reinforced, in this situation, by the tendons of the ...