Final answer:
Enamel is not a tissue layer found in skeletal bones; it is a part of the tooth. Periosteum, bone marrow, and cancellous bone are tissues associated with bones, with the periosteum serving as a protective outer covering, bone marrow being involved in blood cell production, and cancellous bone forming the inner layer of the bones.
Step-by-step explanation:
The question asks which of the following is NOT a tissue layer found in skeletal bones: periosteum, bone marrow, enamel, or cancellous bone. Enamel is not a tissue layer found in skeletal bones; it is actually the hard, outer covering of the tooth. Therefore, the correct answer is C) enamel.
Skeletal bones are complex structures that include several types of tissue. The periosteum is a tough, fibrous membrane that covers the outer surface of bones, while bone marrow is a soft connective tissue found within the marrow cavity of bones.
There are two types of bone marrow: yellow marrow, which consists mostly of fat, and red marrow, which contains hematopoietic stem cells that produce blood cells. Cancellous bone, also known as spongy bone, forms the inner layer of all bones and does not contain the osteons that make up compact bone tissue.