Appendicular Skeleton: Includes the bones of the limbs and those of the pectoral and pelvic girdles, which attach the limbs to the trunk.

Arthritis: Inflammation of a joint.

Axial Skeleton: Forms the longitudinal axis of the body.

Bursa: A small sac filled with Synovial fluid that cushions adjacent structures and reduces friction.

Cartilage: A connective tissue with a gelatinous matrix containing an abundance of fibers.

Endoskeleton: Internal skeleton or supporting framework in an animal.

Fontanels: A relatively soft, flexible, fibrous region between two flat bones in a developing skull.

Haversian Canals: Central canal that contains one or more blood vessels.

Joints: An area where adjacent bones interact.

Ligaments: Dense band of connective tissue fibers that attach one bone to another.

Marrow: A tissue that fills the internal cavities in a bone.

Ossification: Formation of bones.

Osteology: Science concerned with the structure and function of bones.

Periosteum: Layer that surrounds a bone, consisting of an outer fibrous and inner cellular region.

Synovial Fluid: Substance secreted by Synovial membranes that lubricate joints.

Tendons: A collagenous band that connects a skeletal muscle to an element of the skeleton.