Orbital lamina of ethmoid bone
|Orbital lamina of ethmoid bone|
Ethmoid bone from the right side. (Lamina papyracea visible at center left.)
The seven bones which articulate to form the orbit. (Ethmoid is brown.)
|Latin||Lamina orbitalis ossis ethmoidalis|
The lamina papyracea (or orbital lamina) is a smooth, oblong bone plate which forms the lateral surface of the labyrinth of the ethmoid bone in the skull. The plate covers in the middle and posterior ethmoidal cells and forms a large part of the medial wall of the orbit.
Its name lamina papyracea is a literal description, as this part of the ethmoid bone is paper-thin and fractures easily. A fracture here could cause entrapment of the medial rectus muscle.
- Anatomy photo:29:st-0201 at the SUNY Downstate Medical Center - "Orbits and Eye: Bones"
- Anatomy diagram: 34256.000-2 at Roche Lexicon - illustrated navigator, Elsevier
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