Elbow (medial epicondyle), wrist (lacerations), or fracture of hook of hamate- Loss of hypothenar muscles, 3rd and 4th lumbricals, all interossei and adductor pollicis- With elbow lesion there is a minimal weakening of wrist flexion with radial deviation- Loss of abduction and adduction of digits 2-5 (interossei muscles)- Weakened interphalangeal (IP) extension of digits 2-5- Loss of thumb adduction- Atrophy of hypothenar eminence- "Claw hand": note that clawing is greater with a wrist lesion- Sensory loss on medial 1¹/₂ digits