The structure in a long bone?

Compact Bone

This is the outer layer of a long bone and provides strength and protection.

Spongy Bone

This is the inner layer of a long bone and helps absorb shock and produce red blood cells.

Periosteum

This is the tough, fibrous membrane that covers the outer surface of a long bone. It contains blood vessels that nourish the bone and cells that help repair damage.

Endosteum

This is the thin membrane that lines the inner surface of a long bone. It contains cells that help produce red blood cells.

Diaphysis

This is the long, cylindrical shaft of a long bone.

Epiphysis

This is the rounded end of a long bone.

Articular Cartilage

This is the smooth, white cartilage that covers the ends of bones at the joints. It helps reduce friction and wear and tear.

Bone Marrow

This is the soft, jelly-like tissue in the center of long bone. It produces red blood cell and white blood cells.