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Saturday September 6, 2008
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Muscles of the Upper Extremity / Interosseous Muscles
Page: 1
| Origin |
Dorsal 1 - 4: Adjacent sides of two metacarpals (bipennate muscles)
Palmar 1 - 3: Palmar surfaces of 2nd, 4th and 5th metacarpals (unipennate muscles) |
| Insertion |
Dorsal 1 - 4: Extensor expansions and bases of proximal phalanges of digits 2 - 4
Palmar 1 - 3: Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5 |
| Action |
Dorsal 1 - 4: Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints
Palmar 1 - 3: Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints |
| Innervation |
Deep branch of ulnar nerve (C8 and T1) |
Arterial
Supply |
Dorsal 1 - 4: Dorsal and palmar metacarpal arteries
Palmar 1 - 3: Palmar metacarpal arteries | |
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