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34 Cards in this Set
- Front
- Back
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What are the nerves involved in innervating the TMJ?
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Trigeminal Nerve (V)
-Mandibular Branch (3) -Auriculotemporal nerve does most -Deep Temporal -Masseteric |
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Which TMJ artery is posterior?
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superficial temporal
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Which TMJ artery is anterior?
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middle meningeal
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Which TMJ artery is inferior?
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internal maxillary
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What type of joint system is the condyle and disc?
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rotational (hinge)
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What type of joint system is the mand. fossa and disc?
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translational (sliding/gliding)
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Which part of the mand. condyle is more prominent?
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the medial pole is more prominent than the lateral pole
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What is the articular disc made of?
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dense fibrous connective tissue
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What are the two types of joint lubrication of the TMJ?
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boundary and weeping
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What are the zones of the articular surface?
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articular
proliferative fibrocartilagenous calcified cartilage |
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What is the articular zone of the articular surface composed of?
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chondrocytes and an intercellular matrix
dense fibrous connective tissue |
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What is the proliferative zone made of and what does it do?
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mainly cellular
undifferentiated mesenchymal cells makes articular cartilage according to demands |
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What is the fibrocartilagenous zone made of and what does it do?
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3 dimensional network of crossed collagen fibrils
resists compression and lateral forces |
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What is the calcified cartilage zone made of and what does it do?
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chondrocytes and chondroblasts
remodels the bone |
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What are the ligaments of the TMJ made of?
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collagenous connective tissue fibers
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Which ligament is responsible for the hinging movement of the TMJ?
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collateral
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What are the functions of the capsular ligament?
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surround joint
protection retain synovial fluid |
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What are the two parts of the temporomandibular ligament, and what do they do?
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Outer Oblique Portion
-limits rotational movement Inner Horizontal Portion -limits posterior movement |
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What does the stylomandibular ligament do?
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limits protrusive movement
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How wide is the mandibular condyle mediolaterally?
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18-23 mm
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How wide is the mandibular condyle anterioposteriorly?
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8-10 mm
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Describe the orientation of the mand. condyles with respect to the skull.
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rotated so they point to the anterior border of the foramen magnum.
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The articular surface of the mand. condyle is composed of what three surfaces?
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anterior
superior posterior |
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What are two other names for the mandibular fossa?
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articular fossa
glenoid fossa |
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What is the only muscle that connects to the articular disc? What action does it do?
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Superior head of Lateral Pterygoid
Protracts disc |
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Which sagittal region of the articular disc is in contact with the articular surface of the condyle?
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the intermediate zone
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Which sagittal region of the articular disc is thickest?
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posterior border
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What happens to the lubrication mechanism of the TMJ during prolonged clenching activity?
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the synovial fluid is depleted leading to friction
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How wide can the mouth open using only rotational movement?
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20-25 mm
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What keeps the disc with the condyle as it translates?
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disc morphology
interarticular pressure |
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What keeps the TMJ stable?
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Biconcave disc
Articular pressure Muscles and ligaments |
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Is the superior head of the lat. pterygoid muscle active or inactive during opening?
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Inactive
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When is the superior head of the lat. pterygoid muscle most active?
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On closure of the jaw
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When is interarticular pressure high?
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when jaw is open or clenched
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