appendicular skeleton

Includes the bones of the arms and legs and structures associated with them, such as the shoulder and hip bones, wrists, ankles, fingers, toes and so on.

axial skeleton

Includes the skull and the bones that support it, such as the vertebral column, the ribs, and the sternum.

joint

Where two or more bones meet.

ligament

Tough band of connective tissue that attaches one bone to another.

bursa

Fluid-filled sacs located between certain bones.

tendon

Thick bands of connective tissue attaching muscles to bone.

compact bone

Hard bone made up of repeating units of osteon systems.

spongy bone

Less dense bone filled with many holes and spaces.

osteoblast

Potential bone cells which secrete a protein called collagen in which minerals in the bloodstrean begin to be deposited. Bone building cells.

osteocyte

Living bone cells

red marrow

The production site for red blood cells, white blood cells, and cell fragments involved in blood clotting.

yellow marrow

Found in many bones; consists of stored fat.