Chapter 11 Part 4 Mandible and Orbits

Mandible Largest _________ facial bone 2 parts –______ Angle (Gonion)

Mandibular Ramus ____________ – ‘U’ shape at top of mandibular ramus __________ Process – Anterior projection of mandibular notch __________ Process – Posterior projection of mandibular notch –Condyle –Neck

Mandibular Body ____________ – Division of Right and Left _________ (Mental Protuberance) – Anterior projection (Chin) Mental ________ – Center of mental protuberance Mental ________ – Holes for nerves and blood vessels

TMJ Temporomandibular Joint Only ___________in the skull Mandibular condyle and Temporomandibular fossa Synovial / Diarthrodial Hinge (_________) and gliding (_______) movement

Orbits 7 bones Rim –_________ –Zygoma –_________ Posterior walls –Lacrimal –___________ –Palatine

Orbit shape Cone Shaped –Apex at ____________ With ____________with the floor –_____ superior –_____ toward mid sagittal

Orbit openings Optic ____________ – Hole in sphenoid for optic nerve Superior ____________ – Cleft between greater and lesser wing of sphenoid Inferior ____________ – Cleft between maxilla, zygo, and greater wing of sphenoid ____________ – Separates superior orbital fissure and optic canal (for optic foramen)

Imaging the Mandible Routine PA AP Towne Axiolaterals Lateral 70 – 80 kV 40” SID Panorex**

PA Mandible Prone Forehead and nose on table ______________to IR Have pt close mouth CR to _______________of lips Remember can be done __________

AP Towne Supine ________________to IR Angle CR ______________ Center at level of ______________

Axiolateral Right and left Position pt in ___________ Tilt head __________ Midsagittal plane to form ___________ Center through mid mandibular body If pt cannot tilt head ____________

Panorex Position head in panorex with ___________to floor No rotation Instruct pt to remain still. _____________in Tube will rotate around pt Entire Mandible seen ____________

Imaging the TMJ Law’s ___________mouth Schuller’s __________mouth kVp 40” SID

Law’s Right and Left Position in ______________downside TMJ to be imaged Place pt in true facial bone ________ Rotate face _________table Angle CR ___________ Center through downside TMJ Do ____________mouth

Schuller’s Right and Left Position into ____________ Place pt into true facial bone lateral Angle CR ___________ Center to downside TMJ ____________mouth

Imaging the Orbits Routine Waters Rhese 70 kV 40” SID

Rhese Prone Pt’s _________________on table (3 points) Rotate head ____________affected side –Mid sagittal plane will have a ___________ _______________to IR Center through downside Orbit Optic foramen should be in lower lateral aspect