periosteum, pl. periostea (per-e-os´te-um, -a) [NA]

The thick fibrous membrane covering the entire surface of a bone except its articular cartilage. In young bones, it consists of two layers: an inner cellular layer that is osteogenic, forming new bone tissue, and an outer fibrous connective tissue layer conveying the blood vessels and nerves supplying the bone; in older bones, the osteogenic layer is reduced. See also perichondral bone.periost; [Mod. L. fr. G. periosteon, ntr. of adj. periosteos, around the bones, fr. peri, around, + osteon, bone]
alveolar p. , p. alveola´re periodontal ligament
p. cra´nii pericranium


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