A thin fibrous connective tissue sheath that surrounds the shaft of a bone but is not found on articular surfaces is the?

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Multiple Choice

A thin fibrous connective tissue sheath that surrounds the shaft of a bone but is not found on articular surfaces is the?

Explanation:
The periosteum is the structure described. It is a dense fibrous membrane that coats the outer surface of most bones, extending along the shaft (diaphysis) but not covering the articular cartilage at joints. It has two layers: an outer fibrous layer that provides strong attachment for tendons and ligaments, and an inner cambium (osteogenic) layer containing osteoblasts and progenitor cells important for bone growth and repair. Blood vessels and nerves reach the bone through the periosteum, and Sharpey's fibers anchor the periosteum to the bone matrix. Articular surfaces are covered by articular cartilage instead, which is why the periosteum isn’t present there. Inside the bone, the endosteum lines the medullary cavity and trabeculae, but that’s a different lining from the external periosteum.

The periosteum is the structure described. It is a dense fibrous membrane that coats the outer surface of most bones, extending along the shaft (diaphysis) but not covering the articular cartilage at joints. It has two layers: an outer fibrous layer that provides strong attachment for tendons and ligaments, and an inner cambium (osteogenic) layer containing osteoblasts and progenitor cells important for bone growth and repair. Blood vessels and nerves reach the bone through the periosteum, and Sharpey's fibers anchor the periosteum to the bone matrix. Articular surfaces are covered by articular cartilage instead, which is why the periosteum isn’t present there. Inside the bone, the endosteum lines the medullary cavity and trabeculae, but that’s a different lining from the external periosteum.

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