Mandible , TMJ Flashcards
_____ is the largest and denset bone of the face.
Mandible
What does the mandible consists of:
- ____
- ___
- curved horizontal portion= Body
2. 2 vertical portions = rami
At birth the mandible consists of bilateral piecies held together by ______, that ossifies during the _____ year of life.
- fibrous symphysis
2. 1st year of life
_____ is located at the site of ossification and is a triangular prominence
mental protuberance
____ is the most anterior and central part of the mandible
symphysis
____ is where the left and right halves of mandible are fused
symphysis
The superior boarder of the body of the mandible consist of spongy bone called the ______.
Alveolar process
Each ramus presents 2 process at its upper extremity
- ____
- ___
- Coronoid process ( anterior)
2. Condylar process ( posterior)
The 2 process of the rami are separated by a concave area called _____.
mandibular notch
______ articulates with mandibular fossa of the temporal bone
condylar process
The TMJ is situated immediately in front of the _____.
EAM
_____ is a small U-shaped structure. It is situated at the base of ____. It is an ______ bone of the axial skeleton
1.Hyoid bone
2. Base of tongue
3 Accessory
The ______ is the only bone of the body that does not articulate with any other bone
hypoid bone
What does the hyoid bone consists of:
- body
- 2 greater cornua
- 2 Lesser cornua
Why is there not a lateral projection of the mandible
because both halves of the mandible would superimpose each other obscuring information from both sides.
What makes up the condylar process
condyle
&
neck
For an axiolateral projection of the mandible , the head in true lateral position best demonstrates the ______
ramus
for an axiolateral oblique projection of the mandible , the head in 30degree rotation toward IR best demonstrates the _____
body
for an axiolateral oblique projection of the mandible , the head in 45degree rotation best demonstrates the _____
mentum / symphysis
For an axiolateral oblique projection ____ degree to ____degree rotation best provides a general survey of mandible.
10 to 15 degree rotation
Position for a PA Mandible
Rami
check series notes
*exits acanthion
Position for a PA Axial Mandible ( Rami)
- 20-25 degree cephalad
* Exits acanthion
Position for an Axiolateral Mandibe
*Ramus: True lateral position
- 25 degree cephalad
- CR exits mandibular region of interest
Position for an Axiolateral Oblique: Body of mandible
- 25 degree cephalad
* MSP is 30 degrees towards IR
Position for an Axiolateral Oblique :
Sympysis /mentum
- 25 degree cephalad
* MSP= 45 degree towards IR
In the ____ projection of the mandible , the C-spine will over lap the body
Axiolateral oblique projection of the sympysis / mentum
- should not overlap in the axioloateral ramus or axiolateral oblique of the body
_____ is a A semi-circular tomographic image of the mandible
panorex
Position for a AP Axial TMJ
Town’s method
* CR= 35 degree caudad OML or 42 degree IOML
*CR enters the Glabella & MSP or 3” above nasion
( CR needs to skim TMJ)
What is the difference between the open mouth and closed mouth AP Axial TMJ
Open mouth: Condyle and TMJ are Below pars petrosa
As you open your mouth the condyles are _____ from mandibular fossa
pulled out
= Inferior to the articular tubercle
Where are the condyles during a closed mouth examination
In the mandibular fossa
Shuller method is the method name for which projection
Axiolateral TMJ
Position for an Axiolateral TMJ
Name the method
AKA Schuller method 10 x 12" CW IR *25-30 degree caudad *CR enters 2" superior and 1/2" anterior to EAM *CR exits TMJ of interest *Head in true lateral position IPL = perpendicular MSP=//
_____ is the method name for Axiolateral Oblique of TMJ
Modified Law method
Position for Modified Law method
- What lines are of interest ?
*Axiolateral Oblique TMJ
- Double 15’s ( MSP and Tube angle)
- MSP 15 degrees towards IR
- CR =15 degree caudad
- CR enters: 1 1/2” above EAM
- CR Exits TMJ of profile
- AML = // with transverse axis of IR
______ extends posteriorly to join _____ of temporal bone
- Temporal process
2. zygomatic process
What forms the zygomatic arch
union of the temporal process of zygoma
and
zygomatic process of temporal bone
SMV stands for
Submentovertical
Position for a SMV of Zygomatic arches
- CR enters Perpendicular to IOML
* Enters MSP of throat @ level 1 “ posterior to outer canthus
Position for Tangential Zygomatic Arch
- Rotate MSP of head 15 degree toward side being examined
- tilt top of head 15 degree from side being examined
- CR centered to z-arch at a point 1” posterior to outer canthus
What is the method name for an AP axial Zygomatic arches
Modified Towne’s method
Position for a modified Towne’s method
- AP Axial Zygotmatic arches
- CR enters glabella & MSP or 1” above nasion
CR = 30 degrees caudad
OML is perpendicular
