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 ?
Air cells located below the ethmoid bulla, along the maxillary sinus roof and most inferior portion of lamina papyracea including air cells located within the infundibulum.
Fracture of the lamina papyracea is usually best demonstrated on CT.
6,16,17) The most common radiologic finding on CT was bony defect of lamina papyracea and/or medial superior orbital rim.
Air cells located below the ethmoid Bulla, along the maxillary sinus roof and a most inferior portion of lamina papyracea, including air cells located within the infundibulum: Bolger et al.
The medial border of the infundibulum is the lamina papyracea of orbit.
These findings of ossification were described as extending into the right ethmoid cells to the lamina papyracea with no extension into the orbit (figure, B).
There was also thinning and displacement of the ipsilateral lamina papyracea noted but no evidence of any bony erosion.
Computed tomography (CT) of the sinuses demonstrated a large, enhancing mass within the left ethmoid sinus; CT also showed tumor erosion through the anterior cranial fossa and the left lamina papyracea and compression of the medial rectus muscle and optic nerve (figure 1).
The bony structure that allows attachment to the lamina papyracea is called the basal lamella.
Bony erosion of the anterior cribriform plate and left lamina papyracea was also noted on review of the films.
Post op CT: Showed no residual foreign body with bony defect of medial orbital wall in the region of lamina papyracea and ethmoid septae with polypoidal mucosal thickening in the left maxillary sinus.
This ensures a high degree of surgical accuracy in the nasal cavity, which is particularly important when working in critical areas such as the lamina papyracea, the roof of the sphenoid sinus, and near the thin lateral lamella of the cribriform plate.

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