Assertion: periosteum | /r/HasProperty | two layers
Facets:
Source sentences:
text: The periosteum in the adult is composed of two layers, an outer fibrous sheath of axially aligned collagen fibers that contains both fibroblasts and mesenchymal cells7 and which is composed of types I, III and VI collagen8,9 and elastin.10,11 Type III collagen is found in abundance in blood vessels, and may reflect the vascularity of periosteum, but because it cross-links rapidly may also function to reduce the extensibility of the tissue and enhance stability.12
text: The periosteum is a highly vascular tissue and is comprised of 2 layers: the inner cellular or cambium layer that contains numerous osteoblasts and osteoprogenitor cells  and an outer fibrous layer composed of dense collagen fibre and fibroblasts and their progenitor cells .
text: Periosteum is composed of two layers:
text: Periosteum is composed of two layers: Fibrous periosteum(outer layer): It is composed mostly of collagen.