Each metacarpal consists of a base, shaft along with a head. The medial and lateral surfaces from the metacarpals are concave, making it possible for attachment in the interossei muscles. Moreover, the deep head from the flexor pollicis brevis is innervated from the deep branch of the ulnar nerve. As https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/