lamina papyracea


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or·bi·tal plate of eth·moid bone

[TA]
a thin plate of ethmoid bone forming part of the medial wall of the orbit and the lateral wall for the ethmoidal labyrinth.

lamina papyracea

A thin, smooth plate of bone on the lateral surface of the ethmoid bone; it forms part of the orbital plate.
See also: lamina

lamina papyracea

Synonym for the orbital plate of the ethmoid bone, which forms part of the medial wall of the orbit. It is thus named because it is as thin as paper and this may contribute to an infection of an ethmoidal sinus spreading into the orbit and resulting in orbital cellulitis. See orbital cellulitis.
References in periodicals archive ?
The infection can spread directly through the thin lamina papyracea into the orbits.
Although the lamina papyracea was intact in patient 1, an iatrogenic bony defect with intact periorbita was identified in patient 2.
5) The posterior ethmoid cells are separated from their anterior counterparts by the ground lamella of the middle turbinate, which attaches laterally to the lamina papyracea of the ethmoid bone.
2) Periorbital emphysema occurs secondary to a breach of the lamina papyracea during sinus surgery and the subsequent ingress of air from the nasal cavity and/or sinuses.
Contrast-enhanced CT of the sinuses identified a left intraorbital mass that had eroded the lamina papyracea with minimal rim enhancement (figure 2, A).
Prominent scalloping of the lamina papyracea was visible, but there was no bony erosion or evidence of intracranial extension.

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