(E2) 2 - Temporomandibular Joint Flashcards
Exam 2 - Schroeder
What is the TMJ an articulation between?
- mandibular condyle and articular eminence & glenoid fossa of the temporal bone
Describe the temporal bone. (location and contents)
What 4 parts make up the temporal bone?
- squamous
- petrous
- tympanic
- mastoid
What is contained in the squamous part of the temporal bone?
Name the labeled colors (yellow, blue, red, green)
What is the articular eminence?
Describe the slope and steepness of the articular eminence.
What is location and function of the preglenoid plane?
______ = Indistinct anterior boundary. Gradually rises from infratemporal surface
Preglenoid Plane
_______ - also called mandibular fossa. Superiormost posrtion of fossa is dome (has non-articular portion - posterior & inferior)
Glenoid Fossa
Glenoid Fossa - Describe the anterior portion
- Articular
- Lies within the squamous part of the temporal bone
Glenoid Fossa - Describe the posterior portion
- Non-Articular
- lies within the tympanic part of the temporal bone
Describe the Glenoid Fossa. (shape)
What is the articular tubercle? (location, attachment site for)
What is the postglenoid tubercle?
What is the tympanosquamosal fissure?
- creates small separation between articulating and non articulating areas
What is the tegmen tympani?
______ forms the roof of the tympanic cavity (middle ear) and bony auditory tube
Tegmen Tympani
Describe the Mandibular condyle head
___ is the inferior constriction found under the mandible head
Mandibular neck
What two parts of the mandible make up the mandibular condyle?
Mandibular condyle head and mandibular neck
The mandibular condyle is wider _____ than long _______
- mediolateral
- anteroposterior
The mandibular condyle is oriented _____ to ramus
perpendicular
Are condyles parallel to each other?
NO
______ and _____ of condylar head extend wider than ramus
- medial pole
- lateral pole
Articular disc attaches to _______
both poles (medial and lateral)
The Temporomandibular ligament
attaches to______ pole
lateral
______ Encompasses joint to
retain synovial fluid. Well innervated
Articular capsule
What is ankylosis?
Stiffness or fixation of a joint
Temporomandibular (lateral) ligament attachment
Attaches to articular tubercle and neck of condyle
Describe the Temporomandibular (lateral) ligament
Temporomandibular (lateral) ligament: Small bundle of horizontal and oblique fibers limits _____ and _____ displacement
-posterior
- inferior
Temporomandibular (lateral) ligament: Oblique portion limits ___________
extent of mouth opening
Temporomandibular (lateral) ligament: Full opening requires _____ displacement onto articular eminence
anterior
What is the remnant of Meckel’s cartilage?
Sphenomandibular ligament
Describe the Sphenomandibular Ligament (location and action)
_____ nerve and ____ artery course between the sphenomandibular ligament and TMJ capsule
- auriculotemporal nerve
- maxillary artery
_____ (nerve) splits adjacent to the lingular attachment of the sphendomandibular ligament
Nerve to Mylohyoid
Describe the stylomandibular ligament (location and movement)
Dense fibrous connective tissue that
partitions TMJ into two spaces - What is it?
Articular Disc
Describe the articular disc
Compare and Contrast the Central and Peripheral part of the articular disc
The articular disc has 2 thickenings called the ___________ separated by an _________
- anterior and posterior bands
- intermediate zone
Articular Disc: Which band is the thickest and where is it located?
Articular Disc: Attaches to the ________
Articular capsule 360 degrees
Articular Disc: Creates a _____ and ______ cavity each lined with _________
- superior and inferior
- synovial membrane
Articular Disc: Superior Vs Inferior cavity. Which is large?
Superior is slightly larger
What are the 2 collateral (discal) ligaments that attach the articular disc to the poles of the condyle?
- Medial discal ligament
- Lateral discal ligament
Describe the medial and lateral discal ligaments.
What is the Superior Retrodiscal lamina?
What is the Inferior Retrodiscal lamina?
_________ Nerve that innervates muscles of mastication also innervates TMJ
Mandibular Nerve
3 Branches off of the Mandibular nerve (there are more but these we need to know)
Venous blood returns through
_________ and _________ that unite to form the retromandibular vein
- superficial temporal
- maxillary veins
What are the first main branches off of the maxillary supplying the TMJ?
- deep auricular
- anterior tympanic
(superficial temporal branches also supply part of the joint area)
