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Skull and Sinus
RAD Positioning
| Question | Answer |
|---|---|
| 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
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