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periosteum Syllabification: per·i·os·te·um
Pronunciation: /ˌperēˈästēəm/

Definition of periosteum in English:

noun (plural periostea-ˈästēə)

A dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints.
Example sentences
  • Holes and channels run through it, carrying blood vessels and nerves from the periosteum, the bone's membrane covering, to its inner parts.
  • The resultant cellulitis is preseptal, or anterior to the orbital septum, involving a fibrous layer beginning at the periosteum of the skull and extending to the eyelids.
  • The orbital septum, a connective tissue reflection of the periosteum, inserts into the eyelids and separates them from the orbits.


Pronunciation: /ˌperēˈästēəl/
Example sentences
  • Intraoperatively there was no evidence of either dural or periosteal penetration.
  • Patients with nonunions had a history of repetitive trauma, periosteal new bone formation, and complete obliteration of the medullary canal at the fracture site.
  • A periosteal flap was harvested from the proximal medial subcutaneous border of the tibia.


Late 16th century: modern Latin, from Greek periosteon, from peri- 'around' + osteon 'bone'.

Definition of periosteum in:
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