arm, the forearm, and the hand. These bones are classified
as follows:

Upper Arm:
Scapula, or shoulder-blade,
Clavicle, or collar bone,
Humerus, or arm bone,

Forearm:
Ulna,
Radius,

Hand:
8 Carpal or wrist bones,
5 Metacarpal bones,
14 Phalanges, or finger bones,

making 32 bones in all.


43. The Upper Arm. The two bones of the shoulder, the scapula
and the clavicle, serve in man to attach the arm to the trunk. The
scapula, or shoulder-blade, is a flat, triangular bone, placed point
downwards, and lying on the upper and back part of the chest, over the
ribs. It consists of a broad, flat portion and a prominent ridge or
_spine_. At its outer angle it has a shallow cup known as the _glenoid
cavity_. Into this socket fits the rounded head of the humerus. The
shoulder-blade is attached to the trunk chiefly by muscles, and is capable
of extensive motion.