Facial/sinuse/orbits/manible Flashcards
The the MML is perp. to the plane of the IR, the OML should be _____ degrees from the plane of the IR.
37 degrees
The Union of the two bodies of the mandible meets at a midline called?
Symphysis menti
The CR should be perp to which facial line when performing a SMV view for SINUSES
IOML
Which position of the sinuses will demonstrate ALL of the paranasal sinuses?
Lateral
Tripod fracture involves which facial bone and its separation from three other bones ?
Zygoma bone
Which view of the sinuses will put the petrous ridge BELOW the level of the maxillary sinus floor?
Waters
Parietoacanthial projection is also known as?
The Waters view
This bony structure must be positioned inferior to the maxillary sinus floor on a correct parietoacanthial projection. What structure is this?
Petrous ridge
What is the CR for lateral facial bone?
Midway between outer canthus and EAM
When performing a WATERs position for sinuses, and you have the patient open their mouth, what can be visualized?
Sphenoid sinus
Which two bony structures form the bony nasal septum?
The perpendicular plate of the ethmoid and the vomer
What are the four sinus sets?
Frontal sinus (cranial bone) Ethmoid sinus (cranial bone) Sphenoid sinus (cranial bone) Maxillary sinus (facial bone)
Your patient requires a sinus series but cannot be placed into an erect position. Which position is done to show air/fluid level without erecting the patient?
Cross table lateral
Which position will demonstrate the sphenoid sinus without interference from other bones? (More than one)
Lateral
Open mouth waters
SMV
Which facial bone makes up the outer, lower (lateral and inferior) portion of the external orbital rim?
Zygoma bone
What’s the difference between a routine Waters and a Modified Waters
Routine Waters, MML is perp.
Modified waters, LML is perp. Also in modified, the orbital floor is perp to the IR, which provide less distortion of the orbital rim.
Which facial bone form the posterior one fourth of the hard palate?
Palatine bone
Which position will demonstrate the Jugged Handles for a possible depressed fracture?
SMV
kVp for almost all mandible views?
75-85kVp
How many facial bones are there?
14 all together (some are paired that’s why)
List the facial bones
Maxillary (2) Inferior nasal conchae (2) Zygomatic (2). Vomer (1) Lacrimal (2). Mandible (1) Nasal (2) Palatine (2)
Which facial bone is the largest immovable bone of the face?
The two maxillae (aka maxillary bones) rt and left
Which facial bone so the largest?
Mandible
What supports the teeth?
The alveolar processes
Typo of joint that holds the teeth in the alveolar processes?
Fibrous synarthrodial (Gomphosis)
The Caldwell of the sinuses demonstrates this sinus best.
Frontal sinus
The superior and middle nasal conchae belongs to which bone
Ethmoid bone
Anteriorly, the nasal septum is cartilaginous and is termed?
Septal cartilage
What is the meaning behind the name of the Vomer bone?
Vomer means “plowshare”
A severe deviated nasal septum can cause what difficulty?
A severe deviated nasal septum can block nasal passageway and make breathing difficult through the nose
What is the largest MOVEABLE bone in the head?
Mandible
The angle of the mandible is also known as?
Gonion
Area anterior to the gonion of the body is termed?
Ramus
The area superior to the gonion is termed ?
The body
TMJ is the only moveable joint of the head. What is its classification?
It’s a bicondylar joint that hinge and glides (diarthrodial)
What forms the TMJ
The condyle head of the condyloid process fits into the Temporalmandibular (TM) fossa of the temporal bone to form the TMJ
Location to the TMJ?
Anterior and slight superior to the EAM
What happens to the condyle when the mouth is open?
The condyle moves forward to the front edge of the fossa
At birth, are all the paranasal sinuses present?
No. At birth, only the maxillary sinus is developed. Everything else comes after age 6
Which paranasal sinus develops last?
The ethmoid sinus
An older term for maxillary sinus
Antrum
The PA Caldwell best demonstrate which sinus
Best demonstrate the frontal sinus best but also a little maxillary sinus
The lateral position best demonstrate which sinus
The lateral demonstrate ALL sinuses
The open mouth waters best demonstrate which sinus
Best for maxillary but also everyone else. But best is maxillary
The SMV best demonstrate which sinus
Best demonstrate the ethmoid and sphenoid sinuses
If routine waters is done, and MML is used, how many degrees off the plane is the OML? Where are the petrous ridge located at?
Routine waters = MML used, OML is 37 degrees off the plane and the petrous ridge is below the maxillary floor
If modified waters is done, and LML is used, how many degrees off the plane is the OML? Where are the petrous ridge located at?
Modified waters = LML used. OML is 55 degrees off the plane and the petrous ridge is at the lower third
