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7/31/2019 23. TMJ Jaw Bones
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The Temporomandibular Joint
& Jaw Bones
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TMJ
Type:ginglymoarthrodial synovial
joint
Ginglymus:
Arthrodial:
1st movement:
2nd movement:
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Articulations:
Head of mandibular condyle
Ant. Part of Mandibular fossa
Of?
&
Articular tubercle
of ?
*articular surfaces
fibrocartilage
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Supporting Ligaments
Main (Intrinsic)Articular fibrous capsule
surrounds the J.
attached
sup.:
inf.:
Lat. (TM) Lig.:
runs downwards backwards
between?
prevents?
protects?
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Accessory (Extrinsic)
Stylomandibular lig.:extends between?
thickened part of ?
Sphenomandibular lig.:
lies on medial side &
extends between?
3. Is there any other lig.??
*define the extents of
Mandibular movements
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The Articular Disc
Oval plate of fibrocartilage that is located between articularsurfaces of TMJ
Ant. & post. Bands
Attachments
periphery:
ant.: ? &?
post.:
* The disc divides the Jointcavity into 2 compartments:
Sup. & Inf.
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Movements
1. Depression of mand.
(mouth opening)
3 muscle groups ?
* Main mover ?
2. Elevation:
(mouth closing)
3 muscles?
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3. Protrusion:
(forwards)
3 muscles?
main one?
4. Retrusion, Retraction:
(backwards)by ??
5. Lat. Movement to the sides:
by ??
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Movements of Mouth Opening
Involves 2 kinds of movement:
1. Rotation:
condyle & lower surface of
articular disc ( compartment) 20o (hinge)
2. Translation:
condyle & disc
articular tubercle
until ?? (gliding)
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Relations of TMJ
Ant.:
masseteric a. & n.(from?)
Post.:
glenoid process of ?
tympanic plate of EAM
& ??
Lat.:
parotid gland
Med.:
max. Vessels &auriculotemp. N.
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Dislocation of TMJ
The head of the mandible moves ant. To the articular tubercle
mandible is depressed & the pt. cannot close his mouth
Cause:
excessive contraction of lat. Pterygoid m.
as in: taking a large biteover opening for the dentist
Rx.:pressure the mandible inf. Then post.
by grasping the mandible with your thumbs over lowerdentition
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Clicking of TMJ
When the post. Band of articular disc is anteriorly displaced
(in front of mand. Condyle)
*As the pt. opens his mouth:
the displaced disc, at a certain point, returns to its normalposition
producing the click sound in the joint
Ant. Displacement with reduction
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Anterior Displacement WithoutReduction
The disc remains anteriorly displaced as the mouth is opening
- the pt. cannot fully open his mouth
- Grinding sounds are present
- sometimes perforation of the disc may happened
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The Jaw Bones
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Maxilla
Body & 4 Processes
Body
pyramidal
hollow inside (max. sinus)
Upper surface: ?
Anterolateral surface: ?
Posterolateral surface: ?
Medial surface: ?
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Maxillary Processes
Zygomatic:
projects lat.,
ant. zyg. Arch
Frontal:
sup.,
lat. to nasal bones
Alveolar:
inf.,
contains upper teeth
Palatine:
post.,
ant. 2/3 of hard palate
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Maxillary Foramina
2 foramina:
Infraorbital F.
ant. wall, infraorbital n. & a.
Incisive Foramen:
between palatine processes
post. to central incisors
incisive n. (nasopalatine n.)
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Largest & strongest facial bone
Only movable skull bone beside
The ear ossicles
Horizontal part:
Body
Vertical Parts:
Rami (ramus)
Jxn.:
Angle
Mandible
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Body:
mental foramen
alveolar process
mental protuberance
sup. & inf. Mental spines
mylohyoid line
Ramus:
mandibular notch
coronoid process
condylar process:
head & neck
lingula & mand. foramen
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Mention 8 muscles attached to the mandible ?