![]() ![]() It is called an epiphyseal plate, or growth plate. When bones are still growing in length, there will be a thin layer of hyaline cartilage in between the epiphysis and the diaphysis. Which of the following is mismatched? Spongy bone to trabeculae, compact bone to osteon, or articular cartilage to elastic cartilage? Articular cartilage is composed of hyaline cartilage. This cartilage serves to absorb shock and reduce friction during movement. On their outer surface, the epiphyses have articular cartilage composed of hyaline cartilage, as shown with this chicken bone. The trabeculae shown here are magnified 300 times. Spongy bone is composed of passageways called trabeculae. The compact bone encloses the spongy bone. Each epiphysis has a layer of compact bone. The proximal epiphysis of the femur forms the head. The ends of the long bone are called epiphyses, singular epiphysis. Lamella are layers of bone matrix that form the osteon, the organizational unit of compact bone. The membrane that covers the shaft of the long bone is the osteon, diaphysis, periosteum, or lamella? The periosteum is the external membrane that forms a covering around the diaphysis- that's like the perimeter of a building. The osteons are pulled out on the model for illustration purposes. They are organizational structures composed of concentric rings of bone matrix called lamellae. Also notice the osteons on the bone model. The perforating fibers of the periosteum penetrate the bone, and are continuous with tendons, ligaments, and aponeuroses. The model shown here represents a section of the compact bone of the diaphysis. We will use a model to illustrate how the periosteum surrounds the compact bone. ![]() The superficial membrane that covers the diaphysis is the periosteum. The diaphysis is composed mostly of compact bone. The shaft of the bone is called the diaphysis. In general, long bones, such as the femur, are longer than they are wide. This video will describe the location of compact and spongy bone in the long bone, and indicate the locations of the membranes of the bone that act as coverings. ![]() But compact bone can also become osteoporotic. Osteoporosis can occur, as shown here in the trabeculae of spongy bone. Bone density is a major health concern, because the density can increase the risk of fractures and the need for surgical repair. ![]()
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