Dorsal interossei
Dorsal Interossei
Dorsal interossei (/dɔːrsəl ɪntɛrɒsiːaɪ/; from Latin dorsum, meaning "back", and interosseus, meaning "between bones") are a group of four muscles in the human hand. They are part of the interossei muscles of the hand, which also include the palmar interossei muscles.
Anatomy
The dorsal interossei originate from the adjacent sides of the metacarpal bones, and are inserted into the bases of the proximal phalanges and the extensor expansions. They are responsible for the abduction of the fingers (moving the fingers away from the middle finger).
Function
The primary function of the dorsal interossei is to abduct the index finger, middle finger, and ring finger. They also assist in flexion of the fingers at the metacarpophalangeal joints and extension at the interphalangeal joints.
Clinical Significance
Damage or injury to the dorsal interossei can lead to a loss of finger abduction and can affect the ability to grasp objects. This can be assessed clinically using the Froment's sign.
Related Terms
- Abductor digiti minimi muscle of hand
- Adductor pollicis muscle
- Flexor digitorum profundus
- Flexor digitorum superficialis muscle
- Lumbricals of the hand
External links
- Medical encyclopedia article on Dorsal interossei
- Wikipedia's article - Dorsal interossei
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