Muscles of mastication & TMJ
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What are the muscles of mastication
- MED pterygoids
- LAT pterygoids
Innervation of the muscles of mastication?
Trigeminal nerve CN V
What kind of joint is the TMJ?
complex biaxial bicondylar joint
What does the mandibular condyle articulate with
What direction is the mandibular condyle longer?
medial lateral direction
What is palpated at the mandibular condyle?
what covers the articular surface of the condyle
What contains the mandibular fossa
the temporal bone
Articular eminence location
anterior to the mandibular fossa
postglenoid tubercle location
posterior to the mandibular fossa
Articular surface of mandibular fossa location and lining?
- anterior wall of the fossa (the articular eminence)
- lined with fibrocartilage
nonarticular surface of the mandibular fossa
- its the dome and posterior wall of the fossa
- lined with fibrocartilage
Articular disc function
- cusion the repetitive muscular forces
- separates the joint cavity into 2 synovial joint cavities
Articular disc facts
- made of fibrocartilage
- attaches to the capsule along with entire periphery of joint
- sometimes become perforated
Inferior surface of the disc shape
concave to fit the mandibular condyle
superior surface of disc shape
convex posteriorly to fit the mandibular fossa and concave anterior to fit the articular eminence
Anterior band of the articular disc qualities
intermediate band of the articular disc
Posterior band of articular disc
- Has a retrodiscal laminae
- highly vascular
located posterior to the disc and contains a superior lamine and an inferior retrodiscal laminae
what is the superior retrodiscal laminae composed of?
rich in elastin
what is the inferior retrodiscal laminae composed of?
rich in collagen.
Attachments of the disc
- ANT - joint capsule and upper head of lateral pterygoid
- MED/LAT to the medial and lateral condylar poles via fibrous bands
- POST to postglenoid tubercle and back of condyle bia upper and lower layers of bilaminar region
- circumference to joint capsule
Attachments of the joint capsule
- superfiorly to articular tubercle, lips of squamotympanic fissure and circumference of mandibular fossa
- Inferiorly to circumference of mandiular neck
- loose aove the disc and tight below it
- produces synovial fluid and contains sensory nerveendings.
Lateral temporomandibular ligament
slope down and back from the tubercle of the zygoma to the lateral surface and POST border of the mandibular neck
- lies medial to and separate from the capsule
- Attached to spine of the sphenoid and to the lingula of the mandibular foramen
Some fibers pass through the petrotympanic fissure and form the ANT ligament of the malleus in the middle ear
- thickening of deep cervical fascia.
- Stretches from the styloid process to the angle of the mandible
Blood supply of the TMJ?
Superficial temporal and maxillary arteries
Innervation to the TMJ
auriculotemproal and masseteric branches of the mandibular division of the trigeminal nerve
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