What are the deep intrinsic hand muscles ?
The other intrinsic groups of muscles lie deep in the hand and include the interosseous muscles, which abduct and adduct digits 2 to 5; the adductor pollicis muscle, which adducts digit 1; and the lumbricals, which assist in flexion of the metacarpophalangeal (MCP) joint and extension of the proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints