Orbital lamina of ethmoid bone
The orbital lamina of ethmoid bone, (or 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.
|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|
Its name lamina papyracea is an appropriate 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". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2014-01-01.