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Skull and Sinus

RAD Positioning

QuestionAnswer
Two sections of the cranium Skull cap and cranial floor
Bones that make up the skull cap Rt and Lt parietal, frontal and occipital
Bones that make up the cranial floor Rt and Lt temporal, sphenoid and ethmoid
Contains the organs of hearing Temporal
Densest portion of the skull Petrous ridges, pyramids, or pars petrosa
Suture between the frontal and parietal bones Coronal
Posterior end of the sagittal suture Lambda
Last fontanel to fuse in the infant/toddler Anterior fontanel or Bregma at about 18 months
The sutures are what type of joints Fibrous, Synarthroidal, immovable
Forms the superior part of each orbit Frontal
Point located at the bridge of the nose Nasion
TRUE or FALSE: The Ethmoidal Notch is located on the Frontal Bone TRUE
The foramen magnum is located in the ___________ bone Occipital
Another name for the Inion External Occipital Protuberance
Most likely portion of the skull to fracture Squamous portion of the temporal bone
Four portions of the temporal bone Squamous, petrous, mastoid and zygomatic portion
Articulates with all of the other cranial bones Spheniod
Bony Structure that surrounds and protects the pituitary gland Sella Turcica
Skull position that best demonstrates the sella turcica Lateral
The cribriform plate is located On the Ethmoid bone
Skull routine images Towne, PA, Lat (Bilat)
The Petrous ridges correspond to what external positioning landmark TEA
Skull shape when petrous ridges form 40 degree angle from MSP Dolicocephalic
PA Skull best demonstrates Frontal and Ethmoid
Towne best demonstrates Occipital
Positioning lines for Lateral IP perp, MSP //
Positioning lines for PA or PA Caldwell MSP perp OML perp PA CR exits Glabella, PA Caldwell, CR 15 caudad, exits the nasion
Location of the Petrous Ridges on a PA skull Fill the orbits
Positioning lines for Towne AP, OML perp, MSP perp, CR 30 caudad, enters 2.5 above glabella, exits EAM
For an AP Trauma skull how is the CR directed // to the OML
Why sinuses must be done erect To demonstrate air fluid levels
Only sinus cavities present at birth Maxillary
TRUE or FALSE: The Sinuses communicate with each other and with the Nasal cavity TRUE
Older term for the Maxillary Sinuses Antrum of Highmore
Asymmetrical sinus located posterior to the glabella Frontal
Position(s) that best demonstrate the sphenoid sinus Lateral and SMV
Best demonstrates the maxillary sinuses Waters
Best demonstrates the frontal and ethmoid sinuses PA Caldwell
// and perpendicular lines for the SMV IOML // to IR, MSP perp, CR enters between angles of mandible
// and perpendicular lines for the Waters MML perp, MSP perp, OML forms a 37 degree angle with plane of the IR, CR exits acanthion
Created by: EHodgis