Hand by the ability to be brought opposite to the fingers, a muscle action known as opposition. The skeleton of the human hand consists of 27 bones: the eight short carpal bones of the wrist are organized into a proximal row (scaphoid, lunate, triquetral and pisiform) which articulates with the bones of the forearm, and a distal row (trapezium, trapezoid, capitate and hamate), which articulates with the bases of the five metacarpal bones of the hand. The heads of the metacarpals will each in turn articulate with the bases of the proximal phalanx of the fingers and thumb. These articulations with
Normal coordinates a normal neighborhood of a point "p" in "M". A normal neighborhood "U" is a subset of "M" such that there is a proper neighborhood "V" of the origin in the tangent space "TM", and exp acts as a diffeomorphism between "U" and "V". On the normal neighborhood "U" of "p" in "M", the chart is given by: formula_3 The isomorphism "E" can be any isomorphism between the two vector spaces, so there are as many charts as there are different orthonormal bases in the domain of "E". The properties of normal coordinates often simplify computations. In the following, assume