The thumb when a person is standing in the medical anatomical position is the lateral-most digit of the hand. The Medical Latin English adjective for thumb is pollical. Anatomy Bones The thumb consists of three bones: Distal phalanx (of the first digit) Proximal phalanx (of the first digit) First metacarpal Name Location Nerve extensor pollicis longus forearm posterior interosseous nerve abductor pollicis longus forearm posterior interosseous nerve flexor pollicis longus… (More on Thumb)