Of the 206 bones in the human skeleton, the appendicular skeleton includes 126. Functionally, it is involved in locomotion (lower limb) of the axial skeleton and manipulating objects in the environment (upper limb) ).
The appendicular skeleton is formed during development from cartilage, by the process of anal ossification.
The appendicular skeleton is divided into six main regions:

• Collar (4 bones) – Left and right collarbone (2 and scapula (2).
• Arm and forearm (6 bones) – Left and right humerus (2) (arm), elbow bone (2 and radius (2) (forearm).
• Hand (54 bones) – Left and right wrist (16) (wrist), hand joint (10), proximal phalanges (10), medial phalanges (8) and distal phalanges (10).
• Pelvic bone (2 bones) – left hip bone and right hip bone (2).
• Thigh and leg (8 bones) – Left and right femur (2) (thigh), patella (2) (knee), tibia (2 and fibula (2) (leg).
• Feet and ankle (52 bones) – Left and right posterior (14) (ankle), ankle (10), proximal (10), medial (8) and distal (10) phalanges.