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Facial Bone Anatomy & Positioning
RTEC 233 Week 6 FINAL
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Anterior Aspect of Facial Bones
6 paired facial bones 1) 2) 3) 4) 5) 6) 2 single bones 7) 8) 4 3 2 1 7 7 5 8
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Palatine Bones L-shaped bones
_________ portion forms posterior hard palate _______ portion extends between 1maxillae and 1 pterygoid plate of sphenoid bone Articulates with 2 cranial bones and 4 facial bones
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Zygomatic Bones Forms ________ Forms lower outer margin of _______
Articulates with 3 cranial bones 1) 2) 3) Articulates with maxillae
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Inferior Nasal Cochae The only pair of conchae that are _______ facial bones Articulates with 1) 2) 3) 4) Covered with mucous membranes to: ______________________________________________
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Lacrimal Bones About the size & shape of a fingernail
Lacrimal foramen for tear duct Lie anteriorly on the medial side of orbit Can be seen on PA and lateral projections Articulates with 2 cranial bones and 2 facial bones
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Nasal Bones Fused and form bridge of nose Vary in size considerably
The point of junction with the frontal bone is the nasion Articulates with 2 cranial and 2 facial bones
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Vomer Forms inferosuperior part of nasal septum Deviated nasal septum
Depressions for blood vessels Articulates with 2 cranial bones & 4 facial bones
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Mandible Only _______ bone in the skull ________& largest facial bone
___bones at birth Contains ______foramina
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Pathologic Indications for Facial Radiography
Fractures Blowout Tripod LeFort Coutrecoup Foreign Body Osteomyelitis Neoplasms Secondary Osteomyelitis TMJ Syndrome
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Sample Fractures
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Tripod Fractures
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Tripod Fracture
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LeFort Fractures
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Lefort 2
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Foreign Body
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Osteomyelitis
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TMJ syndrome
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TMJ Syndrome
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Positioning: Lateral Facial bones
CR is perpendicular enters lateral zygomatic bone ½ way between outer canthus and EAM.
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Lateral Facial Radiograph
All facial bones in with zygomatic bone in center Almost SI mandibular rami SI orbital roofs (no tilt) No rotation of sella turcica
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Positioning: Waters CR perpendicular to exit acanthion
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Waters Radiograph Distance from lateral border of skull and orbit equal on each side Petrous ridges projected immediately below maxillary sinuses
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Reverse Waters CR perpendicular and enters acanthion
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Reverse Waters Radiograph
Distance from lateral border of skull and orbit equal on each side Petrous ridges projected immediately below maxillary sinuses
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Modified Waters CR perpendicular and exits acanthion
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Modified Waters Radiograph
Petrous ridges projected immediately below the inferior border of the orbits Equal distance from lateral orbit to lateral skull on both sides
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PA Axial - Caldwell CR 15 caudal to exit nasion
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PA Axial- Caldwell Radiograph
Equal distance from lat skull to lat orbit Symmetric petrous ridges in lower 1/3 orbit Penetration of frontal bone without excessive density at lateral borders of skull.
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Lateral Nasal Bones CR perpendicular to the bridge of nose at a point 1” distal to the nasion
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Lateral Nasal bones Radiograph
No rotation of nasal bone and soft tissue Anterior nasal spine and frontonasal suture evident Close collimation
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