The thumb's the lateral-most digit of the hand. The English adjective for thumb's 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 forearm anterior interosseous nerve extensor pollicis brevis fore… (More on Thumb)