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n. pl. per·i·os·te·a (-tē-ə)
The dense fibrous membrane covering the surface of bones except at the joints and serving as an attachment for muscles and tendons.

[New Latin, from Late Latin periosteon, from Greek, from periosteos, around the bone : peri-, peri- + osteon, bone; see ost- in Indo-European roots.]

per′i·os′te·al (-tē-əl), per′i·os′te·ous (-tē-əs) adj.
References in periodicals archive ?
There was no associated periosteal reaction or soft-tissue mass.
Subsequent radiological study revealed a congruent reduction of the radial head, with a progressive periosteal reaction of the posterior cortex of the ulna (Fig.
Other features include expansion of the surrounding bone, an intact thin cortex, and no periosteal reaction or cortical breakdown.
Regardless, recognizing periosteal reaction of any type remains important, as this effectively excludes several lesions from the differential.
A marked periosteal reaction was also present, which extended proximally to the joint.
1) Cortical destruction often occurs, but periosteal reaction is uncommon.
During the healing phase, a laminated periosteal reaction may be present.
A variable amount of periosteal reaction can be present, ranging from a thick solid type to lamellated.
No soft tissue swelling or periosteal reaction was associated with the lesion.
11) Later, five of these features were omitted from the final score: periosteal reaction was too unusual; the quality of radiographs limited the capacity to describe cortical thinning and osteoporosis, and sclerosis and osteophyte formation appeared to be secondary changes.