Anatomy of a Long Bone - Coloring Activity
This coloring worksheet showcases the structures of the long bone. Students read descriptions of each structure and color according to the directions. They will also label the structures and answer reading comprehension questions. Ideal for a health or anatomy class!
1. The epiphysis is the enlarged end of a long bone. It is made mostly of spongy bone with a thin outer layer of compact bone. The epiphyses form joints with other bones and help distribute forces during movement while providing support for the articular cartilage. The end close to the midline of the body is the proximal epiphysis, and the opposite side is the distal epiphysis. Label on the diagram.
2. The diaphysis is the shaft of a long bone. It is composed primarily of compact bone, making it strong and resistant to bending. Label on the diagram.
3. Spongy bone, also called cancellous bone, is a network of thin bony plates called trabeculae. It is found mainly within the epiphyses and contains red bone marrow, where blood cells are produced. Its lightweight structure helps reduce the overall weight of the skeleton while maintaining strength. Color the spongy bone red.
4. The epiphyseal line is the remnant of the epiphyseal (growth) plate found in mature bones. During childhood and adolescence, the growth plate is made of cartilage and allows bones to increase in length. Once growth is complete, the cartilage is replaced by bone, leaving the thin epiphyseal line. Color orange.
5. Articular cartilage is a smooth layer of hyaline cartilage that covers the ends of bones where they meet at joints. It reduces friction between bones and acts as a cushion to absorb shock during movement. Because it lacks blood vessels, damaged articular cartilage heals very slowly. Color light blue.
6. The periosteum is a tough connective tissue membrane that covers the outer surface of a bone, except where articular cartilage is present. It contains blood vessels, nerves, and cells that help bones grow in thickness and repair fractures. Color green.
7. Compact bone, forms the dense outer layer of all bones.. Compact bone protects the inner tissues and supports the body's weight. Color purple.
8. The medullary cavity is the hollow space inside the diaphysis of a long bone. It is primarily filled with yellow bone marrow, which stores fat as an energy reserve. The cavity also helps reduce the weight of the bone. Color yellow.
9. The endosteum is a thin membrane that lines the inside of the medullary cavity and covers the surfaces of the trabeculae in spongy bone. It contains bone-forming cells (osteoblasts) and bone-resorbing cells (osteoclasts), which work together to remodel, repair, and maintain healthy bone throughout life. Color dark blue.
