Near the head, they are connected to the ear sac and meet at the lower end of the mandibular joint, which is the fusion point of two bones and consists of mesoderm tissue.

They move forward under the condyle and then bend downward, located in the groove near the lower edge of the bone; In front of canine teeth, they incline upward to pubic symphysis. The malleus and the incus are two bones of the middle ear, which are produced by the proximal end of each cartilage. As far as the lingual process is concerned, the next subsequent part is replaced by fibrous tissue, and the fibrous tissue sphenomandibular ligament is continuously formed.

Expand data. The lower jaw forms the lower jaw and fixes the lower teeth in place.

The inferior alveolar nerve and blood vessels enter the mandibular canal from the mandibular foramen and advance, and the mental nerve and blood vessels are separated at the mental foramen. The normal angle of mandibular angle is 120, and there should be no edges and corners on the outside, while the hypertrophy of mandibular angle includes two aspects:

First, the mandibular angle is too small, showing a "national" face, and women are not gentle.

Second, the valgus and thickening of the mandible make the face trapezoidal, which does not meet the aesthetic standards. This condition is often accompanied by masseter hypertrophy. The patient's face is wider and more trapezoidal, and the side view shows the male mandibular angle, lacking a soft and smooth contour.

The chin consists of joints with horizontal branches of bilateral mandibles, which are located below the midline of the face. The angle between the lower edge of chin and the upper part of neck is the dividing line between face and neck. The chin, cheekbones and mandibular angle on both sides constitute the basic outline of the face, and together with the nose, lips and other tissues and organs constitute the basic characteristics of facial morphology.

The shape, size and position of chin have great influence on facial appearance. Underdevelopment of chin can lead to "pointed mouth", "pointed face" or "bird face". Overdevelopment of chin can lead to "long face" or "horse face". The deflection of the chin will cause the asymmetry of the whole face.

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