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Chapter 13 (RT150)

Facial and Paranasal Sinuses

QuestionAnswer
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