Composition characteristics of the temporomandibular joint and mode of movement

Search: Temporomandibular joint composition, characteristics and mode of movement.

Clinical Core Test Points: 01 Anatomy 01 Osteopathy and Arthrology 03 Anterior Cranial View 04 Temporomandibular Joint.

7. Intensive lecture on the basics of arthritology in the open course of medical examination - temporomandibular joint and shoulder joint.

Movement of the temporomandibular joint.

Opening (opening of the mouth): Opening of the mouth occurs when the rotation of the mandibular head in the lower joint cavity is followed by the displacement of the articular disc along with the mandibular head in the upper joint cavity to the underside of the joint tubercle. So the temporomandibular joint is a joint on a movable base.

Motivation comes from the mouth opening muscles: (rapid or resistant opening: lateral pterygoid muscles, digastric muscles, superior and inferior hyoid muscles; Reduced temporal muscle activity and gravity are enough to open the mouth.

The mandibular hyoid and mental hyoid muscles are also involved in the lowering of the mandible during hyoid fixation, and the hyoid can be raised when the mandible is fixed. ）

Shut up (shut up): Moves and rotates in reverse. The motivation comes from the obturator muscles: temporalis muscles, masseter muscles, internal pterygoid muscles.

Place your finger in front of the tragus so that you can slowly open your mouth to feel the movement of the lower jaw, and if you place the tip of your finger on the anterior wall of the external auditory canal, you can also feel the back of the mandible. When the mouth is opened, the lower jaw is moved forward away from the examiner's fingertips and when the mouth is closed, it is in place.

Another movement of the mandibular joint is protrusion, retraction, and lateral deviation (this includes lateral and medial displacement movements). The kinetic movement of the jaw is a combination of these movements.

When chewing, they are called cutting and grinding, with cutting being used to cut food and grinding being squeezed and grinding.

1. Movement of the temporomandibular joint:

1. Opening: mouth opening muscle, pterygoid muscle, digastric muscle, superior and inferior hyoid muscle, temporal muscle, mandibular hyoid muscle and mental tongue muscle.

2. Closed mouth: Closed mouth muscles: temporal muscles, masseter muscles, internal pterygoid muscles.

2. Temporomandibular joint.

1. It is composed of the mandibular head, temporal bone, mandibular fossa and joint tubercles, and the left and right are synthesized into a joint joint, which is responsible for opening and closing the mouth and chewing movements.

2. The joint capsule is relaxed, and the lateral side is strengthened by the medial and lateral ligaments.

3. The articular disc in the capsule is oval in shape, composed of fibrocartilage, and is divided into three parts: anterior, middle and posterior.

4. The upper part is saddle-shaped, anteriorly concave and posteriorly convex, corresponding to the convex and concave contours of the articular tubercles and mandibular fossa; The lower concave is directly opposite the mandibular head, the periphery of which meets the capsule, and the anterior edge of which connects to the extrapterygoid tendon that passes through the capsule.

5. The joint disc divides the joint cavity into upper and lower halves. Extra-articular reinforcements are the sphenomandibular ligament (spine spine to the mandibular tongue) and the styloid mandibular ligament (styloid to mandibular angle).

Composition of the temporomandibular joint:

The temporal fossa and articular tubercles (temporal articular surface), the mandibular condyle, and the disc between the first two are enclosed with the joint capsule and the intracapsular ligaments.

Morphological characteristics: The temporomandibular joint, which can be referred to as the mandibular joint, is the only bilateral joint between the left and right sides of the maxillofacial area, with certain stability and multi-directional mobility. Under the action of muscles, various important activities related to chewing, swallowing, speech, and expression are produced.

Exercise mode: 1. Opening: mouth opening muscle, pterygoid external muscle, digastric muscle, upper and lower hyoid muscle, temporal muscle, mandibular hyoid muscle and mental tongue muscle.

2. Closed mouth: Closed mouth muscles: temporal muscles, masseter muscles, internal pterygoid muscles.

The inferior temporal and mandibular joint is composed of the mandibular condyle, the articular concave and articular tubercles of the temporal bone, and the articular disc in between, which surrounds the joint capsule around the Guanrang Chunqing Festival. In addition, there are joint ligaments.

The temporomandibular joint is located between the skull and the mandible, and is divided into left and right sides, which is a two-sided linkage of the twisted chain joint. It is composed of the articular fossa and joint disturbance tubercle of the temporal bone, the condyle of the mandibular branch stool, and the articular disc, joint capsule, joint ligament, etc., and the masticatory muscle attached to the mandible is closely connected with the structure of the temporomandibular joint, and the temporomandibular joint plays an important role in language, chewing, and emotional expression.

Answer: c

The functional surface of the temporomandibular joint is the motor contact surface, which is the posterior bevel of the branchkey joint tubercle and the anterior condylar bevel, rather than the top of the condyle and the top of the fossa, so C is selected for this question.

The composition of the mandibular disturbance joint of the temporal filial ant does not include ().

a.Mandibular condyle.

b.Articular surface of the temporal bone.

c.Articular discs.

d.Joint capsules and articular ligaments.

e.Joint space.

Slowly and cautiously answer the answer: joint space.