Bone Growth · Histology

Which of the following is a key histological difference between the periosteum and the endosteum during growth?

  1. The periosteum lacks osteoprogenitor cells needed for bone repair.
  2. The endosteum is consistently thicker and more vascular than the periosteum.
  3. Only the endosteum contains blood vessels that supply cortical bone.
  4. The periosteum is bilayered, while the endosteum is a single cell layer.
Show answer and explanation

Correct answer: The periosteum is bilayered, while the endosteum is a single cell layer.

The periosteum is a double-layered membrane with an outer fibrous layer and an inner osteogenic layer. The endosteum is much thinner, consisting of a sparse layer of osteoprogenitor cells and osteoblasts lining the internal surfaces.

Difficulty: Medium Question 19 of 20

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