The oral cavity is the initial part of the digestive tract. The anterior fissure communicates with the outside world and then continues to communicate with the pharynx through the pharyngeal isthmus. There are teeth, tongue and other organs in the mouth. The front wall of the oral cavity is the lip, the side wall is the cheek, the top is the palate, and the bottom of the oral cavity is the mucosa and muscles.

The oral cavity is divided into an oral vestibule with an anterolateral part and an oral pillar with a posterior medial part by upper and lower dental arches. When the upper and lower teeth bite, the oral vestibule can communicate with the inherent oral cavity through the space behind the third molar.

Clinically, when the patient's teeth are clenched, an opener or cannula can be placed through this passage to inject drugs or nutrients, and at the same time, tongue biting can be prevented. The oral cavity consists of two lips, two cheeks, hard palate and soft palate. There are teeth, tongue, salivary glands and other organs in the mouth. In the oral cavity, dentition is taken as the dividing line, and the oral cavity is divided into the inherent oral cavity in dentition and the oral vestibule outside dentition.

medical knowledge

1. Stomatology includes stomatology, prosthodontics, stomatology, stomatology, orthodontics and stomatology.

2. Stomatology includes pulp diseases, periodontal diseases, mucosal diseases and children's stomatology.

3. Prosthodontics includes fixed dentures, removable partial dentures, complete dentures and others.

4. Oral basis includes oral anatomy and physiology, oral histopathology, etc.

5. Oral surgery includes alveolar surgery, implant and maxillofacial tumors, salivary gland diseases, orthognathic surgery, temporomandibular joint diseases, oral and maxillofacial plastic surgery, etc.