DORSAL INTEROSSEI
Origin
Bipennate from inner aspects of shafts of all MCs
Action
Abduct from axis of middle finger. Flex MCP jnt whilst extending IP jnts
Insertion
Prox phalanges and dorsal extensor expansion on radial side of index and middle fingers and ulnar side of middle and ring fingers
Nerve
Deep br of ulnar N (T1)
