Dorsal interossei of the hand

With some individual variations, the interossei muscles are attached either proximally or distally on the extensor expansion. The first dorsal interosseous, the most consistent, is inserted entirely into the base of its proximal phalanx and the extensor hood there. The second, third, and fourth dorsal interossei have insertions both proximally on the base of the metacarpal and hood, and distally on the lateral bands and central tendon of the extensor mechanism. The abductor digiti minimi, effectively the "fifth dorsal interosseus" or the dorsal interosseus of the little finger, has only a proximal insertion. The palmar interossei, in contrast, have only distal insertions. The interossei can, thus, be divided into a proximal and a distal group: the proximal interossei are mainly affecting the metacarpophalangeal (MP) joints, whereas the distal interossei are mainly affecting the interphalangeal (IP) joints (but, with continued action, will also affect the MP joints.)[3]

All interosseous muscles of the hand are innervated by the deep branch of the ulnar nerve.[4]

All interossei pass dorsal to the transverse metacarpal ligament but slightly volar to the flexion-extension axes of rotation of the MP joints. In effect, their ability to flex at the MP joints will depend on the position of the MP joints:[3]

When the MP joints are extended, all interossei pass through the flexion-extension axes of the MP joints and their contribution there is therefore negligible, though they still play important roles as joint stabilizers (i.e. preventing MP hyperextension). At the same time, the interossei (and abductor digiti minimi) lie relatively far from the anterior-posterior axis of the MP joints and are consequently effective abductors and adductors during MP extension. Because the dorsal interossei are predominantly in the proximal group they are more effective at the MP joints than the palmar interossei and, therefore, abduction is stronger than adduction at the MP joints.[3]

When the MP joints are being flexed, the position of the interossei moves away volarly from the flexion-extension axes of the MP joints until they are nearly perpendicular to the proximal phalanx. At the same time, the increasingly taut collateral ligaments of the MP joints cancel out the abduction-adduction component to increase the force of flexion (resulting in a strong grip). At full flexion, the transverse metacarpal ligament restricts the interossei.[3]

When the MP joints are extended, effective IP joint extension can be done by all interossei in the distal group (i.e. all except the two outermost muscles, the first interosseus and abductor digiti minimi) because they are attached directly to the extension mechanism. This IP extension is therefore stronger than MP abduction/adduction which is produced by continued action except for the index and little fingers.[3]

When the MP joints are flexed, the transverse metacarpal ligament enhances the function of the distal interossei by acting as a pulley and preventing them from becoming slack, further increasing the effectiveness of IP extension.[3]

Compartment syndrome rarely occurs in the first dorsal interosseous compartment of hand.[6] This condition is caused by excessive use of hand, resulting in pain and swelling on the dorsum of the hand. It can be treated by simple fasciotomy.[7]