The metacarpal bones articulate proximally Together with the carpals, and distally With all the proximal phalanges. They're numbered, and each is related to a digit: Furthermore, the deep head from the flexor pollicis brevis is innervated through the deep branch in the ulnar nerve. Because the abductor pollicis longus intact https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/