Spongy bone

Definition

Spongy bone, also known as cancellous bone, is a porous type of bone tissue found at the ends of long bones and in the interiors of other bones. It contains trabeculae, which are small needle-like pieces that create a supportive framework.

5 Must Know Facts For Your Next Test

1. Spongy bone has a higher surface area compared to compact bone, which allows for metabolic activities such as the exchange of calcium ions.
2. It is filled with red or yellow bone marrow, where blood cell production occurs.
3. The trabeculae in spongy bone are oriented along lines of stress to help resist mechanical forces.
4. Spongy bone makes up roughly 20% of the total bone mass in an adult human body.
5. It plays a crucial role in reducing the overall weight of bones, making movement easier.

Review Questions

• What is the primary function of trabeculae in spongy bone?
• Where can spongy bone typically be found within the skeletal system?
• How does spongy bone contribute to hematopoiesis?

Related terms

Compact Bone: Dense and solid tissue that forms the outer layer of bones, providing strength and protection.

Trabeculae: The network of rod-like structures within spongy bone that provide structural support.

Bone Marrow: Soft tissue found within bones; red marrow produces blood cells while yellow marrow stores fat.