<prompt> In relation to other metacarpals, the first metacarpal isPosteriorAnteriorLaterally rotatedDorsally rotated  <response>: The 1st metacarpal bone lying on a more anterior plane is rotated medially through 90deg relative to other metacarpals. As a result of this rotation , the movements of the thumb take place at right angles to those of other digits. B D Chaurasia 7th edition Page no : 29 