TMJ
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18 terms
Terms | Definitions |
|---|---|
 joint | a junction, a union between two or more bones |
| temporomandibular joint | the articulation of the mandible with the temporal bone |
| mandibular condyle | the condyloid process of the mandible which has an articular surface when is a roughened area on the top surface. |
| glenoid fossa | an oval depression in the temporal bone |
| articular eminence | the raised portion of the temporal bone just anterior to the glenoid fossa |
| posterior tubercle | the raised portion of the temporal bone just posterior to the glenoid fossa |
| articular disc | a body of dense collagen tissue located between the mandibular condyle and the glenoid fossa. it is curved to fit between the bones and facilitates smooth motion. |
| synovial cavities | a small sac-like compartments above and below the articular disc which is lined with epithelial tissue that secretes synovial fluid for the lubrication of the joint. |
| external lateral ligament | attached to the zygomatic process of the temporal bone and extends onto mandible that lies outside of the joint and prevents lateral displacement of the mandible |
| internal lateral ligament | attaches from spine of sphenoid bone to mandible and inserts onto lingula and this is an important landmark for local anesthesia |
| stylomandibular ligament | extends from styloid process of temporal bone to the angle of the ramus |
| articular capsule | a thick and fibrous connective tissue on the outside with a layer of loose connective tissue and rich network of blood vessels that completely encloses the joint |
| temporomandibular ligament | a thickened part of capsule between the eminence and lateral part of condyle that prevents excessive retraction and lateral displacement |
| retrodiscal pad | vascular and nerve tissue behind disc |
| elastic lamina | a layer of tissue that runs from the posterior upper part of disc and inserts into posterior upper end of capsule and attaches to temporal bone. |
| collagenous lamina | a layer of tissue that runs from posterior lower part of disc and attaches to posterior neck of condyle |
| hinge action (rotational) | the first movement as the jaw begins to open first few mm's |
| gliding action | the second movement that occurs between the disc and temporal bone |
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