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24 Cards in this Set
- Front
- Back
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temporomandibular joint (TMJ) |
one of the most frequently used joints in the body. It is used for chewing, swallowing, swallowing, yawning, talking, and any other activity involving jaw motion. located anterior to the ear and at the posterior end of the jaw. |
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depression |
opening of the mouth |
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mandibular elevation |
closing the mouth |
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lateral deviation |
side-to-side jaw movement |
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protrusion or protraction |
moving the jaw forward |
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retrusion or retraction |
moving the jaw posteriorly. is basically the return to anatomical position from protruded position. |
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lateral ligament or temporomandibular ligament |
it limits downward, posterior, and lateral motions of the mandible. |
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sphenomandibular ligament |
it suspends the mandible and limits excessive anterior motion. |
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stylomandibular ligament |
it lies betweenthe masseter and medial pterygoid muscles and plays a role in limiting excessive anterior motion. |
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stylohyoid ligament |
attaches from styloid process of the temporal bone to the hyoid bone. Its function is to hold the hyoid bone in place. |
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joint capsule |
envelops the TMJ by attaching superiorly to the articular tubercle and borders of the fossa of the temporal bone. |
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articular disk of the TMJ |
is similar to the articular disk of the sternoclavicular oint. it is connected circumferentially to the capsule and tendon of the lateral pterygoid. |
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temporalis, masseter, medial pterygoid, lateral pterygoid |
4 main muscle of the TMJ |
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temporalis |
is a rather broad and fan-shaped muscle that lies in the temporal fossa. |
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masseter |
is a thick, almost quadrilateral shaped muscle that produces the fullness of the posterior part of the cheek between the mandibular angle and the zygomatic arc |
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medial pterygoid |
is very similar to the masseter muscle. located on the medial side of the mandibular ramus. |
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lateral pterygoid |
muscle is short, thick, and somewhat cone-shaped. |
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Temporalis, masseter, medial pterygoid |
Elevation |
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Lateral pterygoid |
Depression |
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Lateral pterygoid, medial pterygoid |
Protrusion |
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Temporalis (posterior) |
Retrusion |
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Temporalis, masseter |
Ipsilateral lateral deviation |
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Medial pterygoid, lateral pterygoid |
Contralateral lateral deviation |
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Temporalis, Masseter, Lateral pterygoid, Medial pterygoid |
Trigeminal, CN 5 |
