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Diagram of the mouth

Basic Structures of the Mouth

Click here to go to an Introduction to the Digestive System - Overview

The mouth is the first part of the digestive system. However, textbooks / descriptions vary with some mentioning the teeth as the first part of the digestive system.

When studying anatomy it is useful to be able to describe parts of the body using a diagram, e.g. to answer questions such as: "Describe the features of the mouth with the aid of a diagram."

A very simple labelled diagram of the mouth (anterior view of the mouth) is shown below, followed by notes about each of the structures labelled. This is useful for introductory level courses but doesn't include all of the parts of the mouth that are involved in the initial stages of the digestion process.

To describe the parts of the digestion process that take place (or at least begin) in the mouth, mention the functions of:

  • the tongue, teeth, hard palate and soft palate (which help to reduce the size of the food put into the mouth before it passes beyond the mouth)
  • the parotid glands, the sublingual glands and the submaxillary glands (which secret saliva to help with the process of chewing food)
  • the epiglottis (which prevents food from entering the larynx - at the upper-part of the respiratory system).

 

The following diagram of the mouth (anterior view of the oral cavity) is clickable:
Click the text labels on the diagram for information about the part of the oral cavity indicated by the label (on another page).

Upper Lip Palatoglossal Arch Tonsil Molars (teeth) Upper Lip Hard Palate Soft Palate Uvula Tongue Gingivae Tonsil Canine Tooth Molars (teeth) Premolars (teeth) Canine Tooth Canine Tooth Incisors (teeth) Canine Tooth Gingivae Lower Lip Lower Lip


Structure and Functions of Teeth

Parts of the Mouth

Structure in/of the mouth

Notes / Description

1.

Upper-lip

The lips are fleshy folds of tissue around the opening of the mouth - covered with skin on the outside and a mucous membrane on the inside. The upper-lip is also known as the superior lip and is the lip closest to the nose (as opposed to closest to the chin).

2.

Lower-lip

The lips are fleshy folds of tissue around the opening of the mouth - covered with skin on the outside and a mucous membrane on the inside. The lower-lip is also known as the inferior lip and is the lip closest to the chin (as opposed to closest to the nose).

3.

Hard Palate

The hard palate extends over most of the roof of the mouth. The solid structure of the hard palate is formed by the maxillae and palatine bones.

4.

Soft Palate

The soft palate is located posterior to the hard palate and consists mainly of muscle tissue.

5.

Uvula

The uvula is a projection of soft tissue that hangs, some texts say "dangles", from the soft palate and moves upwards with the soft palate during swallowing. This prevents the food and/or liquid that is being swallowed from passing into the nasal cavity.

6.

Tonsils

The tonsils consist of lymphoid tissue and are part of the immune system.
There are three sets of tonsils in the oral cavity, the lingual tonsils towards the back of the tongue, the palatine tonsils shown in the diagram above and the pharyngeal tonsil in the pharynx.

7.

Tongue

The tongue is a thick muscular organ that forms the floor of the mouth (= "oral cavity"). It consists of skeletal muscle covered with muscous membrane. The tongue also includes many taste buds - each of which consists of three types of epithelial cells: supporting cells, gustatory cells and basal cells. Some school biology courses include lessons about the zones of taste buds on tongue.

8.

Gums

The sockets of the teeth (see below) are covered by dense fibrous connective tissue anchoring the teeth to the appropriate jaw bone (upper jaw bones = maxillae; lower jaw bone = mandible), keeping them in position and acting as a shock-absorber to cushion the impact of the teeth on the bones during active crunching actions.

Teeth - Very brief notes about the teeth labelled in the diagram above. For more info see teeth and the digestive process.

9.

Incisors

Incisors are teeth that are located at the front and mid-line of the mouth. They are relatively flat or "chisel-shaped" and suited for cutting into food.

10.

Canines

Canine teeth are also known as cuspids (a useful term to avoid confusion with the use of the word "canine" to refer to dogs). They have a single pointed surface called a "cusp" which is adapted for tearing and shredding food.

11.

Premolars

Premolars are also known as bicuspids. They are teeth that have two cusps with which to crush and grind food. They are located between the cuspids and the molars, as shown above. Premolar teeth generally have either one or two roots.

12.

Molars

Molars are teeth that have three or four blunt cusps with which to crush and grind food. They are located at the back of the mouth (oral cavity). Molar teeth generally have two roots or three roots, two in the case of the molars in the lower-jaw and three in the case of the molars of the upper-jaw.

Next see the page about the teeth and their role in digestion.

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