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orbit
orbit comp
| Question | Answer |
|---|---|
| What bones make up the orbit? | frontal, ethmoid, sphenoid, lacrimal, palatine, maxillary and zygomatic |
| How is the orbit situated in relation to the MSP? | the long axis is angled 37 degrees obliquely, posteriorly and medially |
| What basic anatomy does the orbit have? | roof, floor, base, medial and lateral walls, apex, fissures |
| What bones bake up the orbit? | frontal, ethmoid, sphenoid, lacrimal, palatine, maxillary, zygomatic |
| What is the purpose of the orbit? | bony socket for eyes, transmission of blood vessels and nerves |
| How does the orbit sit in relation to the OML? | 30 degrees superiorly |
| The apex of the orbit corresponds to: | the optic foramen |
| “blow out fracture” | pressure directed to the eyeball forces the eye into the orbit and breaks the bony floor |
| Positioning and QC considerations for orbit imaging: | smallest OID, close collimation, reduce motion, clean IS |
| Alternate name for Rhese method | parietoorbital oblique projection |
| What is used for the “3 point landing” in a Rhese? | zygoma, nose and chin |
| Pt. position for Rhese | AML perpendicular to bucky, MSP 53 degrees to IR |
| CR entry for Rhese | perpendicular, entering 1” superior, 1” posterior to TEA |
| When positioning for a Rhese, which orbit is of interest? | side down |
| Eval criteria for orbit Rhese method | optic foramina projected into inferior lateral quadrant of orbit imaged |
| If the optic foramina is projected to far superior on a Rhese… | the AML was not correctly angulated |
| If the optic foramina is projected to far medially on a Rhese… | patient rotation was off |
| Pt position for waters | nose and forehead on bucky, crosshares ¾” distal to nasion, MSP and OML perpendicular to IR |
| CR entry for waters | 30 degrees caudad exiting the orbits |
| Eval criteria for waters | petrous pyramids below the orbital shadows, no rotation |
| What piece of anatomy is found at the apex of the orbit? | the optic foramen |
| How does the orbit sit in relation to the MSP? | 37 degrees |
| The apex of the orbit corresponds to: | the optic foramen |
| What can happen if a blowout fracture is not diagnosed? | vision can be jeopardized |
| What does the optic nerve do? | connect the eye to the brain |
| Conjunctiva | thin mucous membrane covering the eye |
| Rods and cones are found on what part of the eye? | the retina |
| Rods are responsible for what type of vison? | night |
| Cones are responsible for what type of vision? | daylight |
Created by:
annaluz87
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