Orbital lamina of ethmoid bone

The orbital lamina of ethmoid bone (or lamina papyracea or orbital lamina) is a smooth, oblong,^{[citation needed]} paper-thin^[1] bone plate^{[citation needed]} which forms the lateral wall of the labyrinth of the ethmoid bone.^[1] It covers the middle and posterior ethmoidal cells, and forms a large part of^{[citation needed]} the medial wall of the orbit.^[1]

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.)
Details
Identifiers
Latin	lamina orbitalis ossis ethmoidalis
TA98	A02.1.07.011
TA2	732
FMA	57451
Anatomical terminology [edit on Wikidata]

It articulates above with the orbital plate of the frontal bone, below with the maxilla and the orbital process of palatine bone, in front with the lacrimal, and behind with the sphenoid.^{[citation needed]}

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.^{[citation needed]}

Additional images

• 
  Orbital lamina of ethmoid bone