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Chapter 13 (RT150)
Facial and Paranasal Sinuses
| Question | Answer |
|---|---|
| Where does the CR exit for a Parietoacanthial-Waters projection? | exits at acanthion |
| Where is the CR centered for LAT facial bones? | Over zygoma between EAM and outer canthus |
| What do the nasal bones articulate with? | Frontal, ethmoid, maxilla, adjacent nasal bone |
| what bones form the bony nasal septum? | ethmoid and vomer |
| What projection best demonstrates the bony nasal septum? | Waters |
| How many facial bones are there? and how many are pairs and how many are single? | 14 total, 6 pairs, 2 singles |
| what two facial bones are not paired? | vomer and mandible |
| what are the names of the 6 paired facial bones? | maxillary, zygomatic, lacrimal, nasal, inferior nasal conchae, palatine |
| what is the largest immovable facial bone? | maxilla |
| name the 4 processes of the maxillary bone? | zygomatic, palatine, frontal, alveolar |
| what two bones form the zygomatic arch? | temporal and zygomatic |
| the union of each lateral half of the mandible is called? | symphysis mentum |
| what degree angle to the IR should the OML form for a waters method for facial bones? | 37 |
| Name the 4 sinus groups? | ethmoid, maxillary, sphenoid, frontal |
| Where do the temporal and zygomatic bones meet? | zygomatic arch |
| What is the thinnest and most fragile bone of the body? | lacrimal bone |
| what are the divisions of the mandible? | body and ramus |
| what is the largest and only movable facial bone? | mandible |
| what divides the body and ramus of the mandible? | Gonion (angle) |
| What are the 2 process of the ramus of the mandible? | Coronoid (anterior) and Condyloid (posterior) |
| What is a fracture of the orbital floor? | Blow out fracture |
| Which facial bones form the posterior aspect of the hard palate? | horizontal portion of the palatine |
| which two cranial bones articulate with the maxilla? | frontal and ethmoid |
| which facial bone is associated with the tear ducts? | lacrimal |
| what is the gonion? | mandibular angle |
| what is the mandibular notch? | u-shaped notch |
| what is the horizontal portion of the mandible? | body |
| what is the posterior process of the upper ramus? | condyloid process |
| what is the bony process located anterior to mandibular notch? | coronoid process |
| what is the vertical portion of the mandible? | ramus |
| what are the 3 foramina found within the orbits? | optic foramen, superior and inferior orbital fissure |
| When are the maxillary sinuses developed? | at birth |
| When are the sphenoid and frontal sinuses developed? | at age 6 or 7 |
| When are the ethmoid sinuses developed? | in late teenage years |
| Which sinus will be projected through the open mouth with a PA axial transoral projection? | sphenoid sinus |
| What is the shape of the maxillary sinus? | cube shape on lateral, pyramid shape on AP |
| Where is the frontal sinus located? | between inner and outer tables of the skull, posterior to the glabella |
| What projection shows all 4 groups of sinuses? | Lateral |
| Which projection shows frontal sinuses the best? | PA Caldwell |
| Which projection shows the maxillary sinus the best? | Waters |
| Which projection shows the ethmoid and sphenoid sinuses the best? | SMV |
| how many bones are the orbits composed of? | 7 total, 3 cranial and 4 facial |
| What are the 4 facial bones of the orbits? | Zygoma, Maxilla, lacrimal, palatine |
| What are the 3 cranial bones of the orbits? | frontal, sphenoid, ethmoid |
| What is the small piece of bone that separates the optic foramen and the superior orbital fissure? | sphenoid strut |
| Which structures are visualized better on the modified waters projection as compared with the basic waters? | orbital rims and floors |
| What positioning line is perpendicular to the image receptor for a waters? | MML |
| What positioning line is perpendicular to the image receptor for a modified waters? | LML |
| How much skull rotation towards the IR is required for the axiolateral oblique projection focusing on the body of the mandible? | 30 degrees |
| How much skull rotation towards the IR is required for the axiolateral oblique projection focusing on the mentum region? | 45 degrees |
| How much skull rotation towards the IR is required for the axiolateral oblique projection focusing on the ramus? | O degrees (true lat) |
| How much skull rotation towards the IR is required for the axiolateral oblique projection focusing on the general survey of the mandible? | 10 to 15 degrees |
| the upper and lower teeth are embedded in the: | alveolar process |
| Where are the ethmoid sinuses located within the ethmoid bone? | lateral labyrinth (masses) |
| Which of the following intersects the glabella, nasion, acathion, and mental point of the skull? | MSP |
| Where is the CR centered for an AP axial (modified townes) projection for the mandible? | glabella |
Created by:
Chrslarsen
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