<prompt> A patient presented with the extension of the MCP joint and flexion of IP which muscle is affectedExtensor digitorumAbductor pollicis brevisAbductor pollicis longusInterossei and lumbricalis  <response>: Extension of MCP and flexion of IP joints is due to palsy of lumbrical and interossei muscles Action of lumbricals flexion of Mcp,,extension of IP Tnt Action of palmar interossei adduction of fingers Action of dorsal interossei abduction of fingers ref : BD CHAURASIA 