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TMJ
Head and Neck Anatomy
| Question | Answer |
|---|---|
| TMJ is the articulation between the........ | Temporal bone and the mandible |
| what joint permits the mandible to move as a unit with 2 functional patterns (gliding and hinging) | synovial joint |
| Most important functions of the TMJ are | mastication and speech |
| What are the 5 functions of the articular disc? | 1. Stabilizes the TMJ 2. Makes articular surfaces congruent 3. Reduces wear of TMJ 4. Aids in lubrication of the joint 5. Movement is not only guided by the shape of the bones, muscles, and ligaments, but also by the occlusion of the teeth |
| What are the 3 parts of the articular disc | Anterior band Intermediate band Posterior band |
| Condyle is in contact with the intermediate zone of the ___ | articular disc |
| Ligaments of the TMJ | |
| _______prevents condyle from being displaced too far inferiorly and posteriorly, provides some resistance to lateral displacement | Temporomandibular ligament |
| ______ prevents mandible from moving backward and protects retro-discal tissues | Lateral ligament |
| _____limits mandible from moving too far down | Sphenomandibular ligament |
| _____limits excessive jaw opening and protrusion | Stylomandibular ligament |
| Blood supply and innervation | |
| Supplies Superficial temporal artery and Maxillary artery | Arterial supply |
| Drains superficial temporal vein | Venous Drainage |
| Supplies Masseteric and Auriculotemporal branches of the mandibular nerve (CN V3) | Nerve Supply |
| Describe the resting state of the tmj (3) | ■ Condyle lies in the mandibular fossa ■ Lips are closed ■ Teeth are separated with slight space |
| The mandible is a single bone made up of 3 parts........ | 1. The Body 2. The Alveolar Process 3. The Ramus |
| The growth of the mandible grows in __ areas which is the ______ and _____ | 2; alveolar process and the posterior border |
| _____and the body increase in width and height | alveolar process |
| Bone is added to the _______ of the ramus to provide lengthening of the mandibular arch. | posterior border |
| What are the 5 movements of the mandible | 1. Depression 2. Elevation 3. Protrusion 4. Retraction 5. A chewing or grinding motion occurs when the movements at the TMJ on one side are coordinated with a reciprocal set of movements at the joint on the other side. |
| rotational/hidge-movement of the first ___ of mouth opening | 20-25mm |
| Movement can also be translational: movement when the mouth is_____ | excessively open |
| TMJ Disorders | |
| Describe etiology of pain in the jaw (3) | -Maloccusion -Wearing of teeth -Loss of teeth |
| Describe treatment for pain in the jaw (3) | -Analgesics -Muscle relaxants -Physical therapy |
| Describe etiology of popping/clicking in the jaw (2) | -Disc being pulled too far forward while opening movement -Disc is trapped between head of condyle and the articular eminence |
| Describe treatment for popping/clicking in the jaw (3) | -Ultrasound -Physical therapy -Plastic splint |
| True or False: disc derangement is the most common disorder | True |
| Describe etiology of disc derangement (3) | -Displaced disc -dislocated jaw -injury to the condyle |
| Describe treatment for disc derangement (1) | surgery |
| Define subluxation | inability to close mouth or it closes with a pop |
| Describe etiology of subluxation (1) | Condyle glides too far forward and anterior to the articular eminence |
| Describe treatment for sublaxation | Place thumbs on occlusal surface of mandibular posterior teeth with index finger beneath inferior border of mandible and push down and back slowly |
| Define Bruxism | grinding teeth |
| Describe etiology of bruxism (2) | -stress -airway disorders (ex:sleep apnea) |
| Describe treatment for bruxism (3) | -night guard -muscle relaxer treat airway disorders |
| Define arthritis | inflammation or degeneration of joints |
| Describe etiology of arthritis (1) | Excessive wear of the disc in the joint due to inflammatory/degenerative joint disorders |
| Describe treatment for arthritis (2) | -Cortisone -Surgery |
Created by:
DH_Student
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