What is the composition of the wall of the diaphysis?

The wall of the diaphysis, which is the central part of a long bone, is primarily composed of cortical (compact) bone tissue. This dense layer of bone provides strength and rigidity to the diaphysis, allowing it to support the weight and withstand stresses during activities such as walking or running. The compact bone has a tightly packed microstructure, making it strong and efficient in carrying out its function of providing support while also protecting the inner structures.

In contrast, cancellous bone tissue, found in the interior of the bone, is less dense and has a more porous structure. It typically supports the bone's overall architecture, particularly in areas where weight bearing is less critical. Cartilaginous tissue is found in joints or areas such as the growth plates, but it does not constitute the wall of the diaphysis. Bone marrow, which serves functions such as blood cell production, resides within the medullary cavity of the diaphysis but is not part of the wall itself. Thus, knowing that the diaphysis is primarily made up of compact bone is crucial for understanding the structural integrity and function of long bones in the skeletal system.