In spongy bone the trabecula is organized into osteons.
a. True
b. False
The correct answer and explanation is :
The correct answer is:
b. False
Explanation:
Spongy bone (also called cancellous bone) and compact bone differ in their structure and organization. One of the key differences between these two types of bone is the arrangement of their trabeculae and osteons.
In spongy bone, the trabeculae are not organized into osteons. Instead, the trabeculae are thin, branching structures that form a network of open spaces within the bone. These trabeculae are made up of lamellae (layers of bone tissue), but they do not form the cylindrical structures known as osteons, which are characteristic of compact bone.
Osteons (also called Haversian systems) are the structural units of compact bone. They are cylindrical structures that contain concentric rings of bone matrix surrounding a central canal, which houses blood vessels and nerves. These osteons are organized in a way that maximizes the strength and rigidity of compact bone, allowing it to resist compressive forces.
On the other hand, spongy bone is found primarily in the interior of bones and is designed for lightweight support and flexibility. The trabeculae in spongy bone are oriented along lines of stress, which helps to support and distribute forces across the bone. The spaces between the trabeculae are filled with bone marrow, which is responsible for producing blood cells.
Spongy bone is less dense than compact bone, and its structure is more open and porous. This arrangement makes it lighter and more flexible, which is important for the functioning of the skeletal system, especially in areas where bone flexibility is needed, such as in the vertebrae. Unlike compact bone, spongy bone does not have the same hierarchical organization of osteons. Instead, it relies on the trabecular network for its strength and support.