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2007-10-15 23:45:14 · 2 answers · asked by Terri L 2 in Science & Mathematics Biology

2 answers

The medial orbital margin is formed superiorly by the frontal bone and inferiorly by the lacrimal crest of the frontal process of the maxilla.
roof of the orbit is composed of 2 bones, the frontal bone and the sphenoid bone.
The frontal bone (#1 in blue) comprises the anterior part of the roof of the orbit and the lesser wing of the sphenoid (#2 in tan) surrounds the optic canal and forms the posterior part of the roof.
Seven bones make up the orbitThe medial wall of the orbit is composed of 4 bones: sphenoid, ethmoid, lacrimal and maxillary bone. The lesser wing of the sphenoid (#2 in tan) is most posterior and is joined to the ethmoid bone (#3 in dark green), moving anteriorly to the lacrimal bone (#4 in light red) and then to the maxillary bone (#5 in light green).

The floor of the orbit is composed of 3 bones: maxillary bone (#5 light green); zygoma (#6 in pink) and posteriorly, the palantine bone (#8 in bright red). The palantine bone borders on the inferior orbital fissure, which narrows posteriorly. In radiologic studies the medial direction and narrowing are key identifiers for this fissure.

2007-10-15 23:57:15 · answer #1 · answered by Meili Wong 2 · 0 0

sounds like you dont want to open the book.

http://en.wikipedia.org/wiki/Orbit_(anatomy)

2007-10-16 06:48:11 · answer #2 · answered by Anonymous · 0 0

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