Dominic Stone
The mouth, or oral cavity, is an orifice through which food and air enter the body. It is composed of several different parts, including the lips, tongue, palate, and teeth. The mouth is responsible for many functions, including eating, breathing, and speaking. The tongue, for example, is a muscle that helps with moving food towards the teeth and eventually to the back of the throat, as well as playing a crucial role in speech. The mouth is also susceptible to various medical conditions, such as infections, ulcers, and oral cancer.
| Characteristics | Values |
|---|---|
| Definition | Orifice through which food and air enter the body |
| Other Names | Oral cavity, buccal cavity |
| Parts | Lips, vestibule, mouth cavity, gums, teeth, hard and soft palate, tongue, salivary glands, taste buds |
| Functions | Eating, speaking, breathing |
| Disorders/Conditions | Infections, ulcers, oral cancer, cleft palate, dry mouth syndrome, dental caries, speech problems, discoloured/chipped/missing teeth, gingivitis, periodontitis, etc. |
| Muscles | The tongue is made up of eight interwoven muscles; the floor of the oral cavity is made up of the mylohyoid and geniohyoid muscles; the superior border of the oral cavity includes the soft palate, which is made up of five different muscles |
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What You'll Learn
The mouth is an orifice for food and air
The mouth has many functions, including eating, breathing, and speaking. It is the first part of the digestive system, where food is chewed and moistened with saliva, which contains the enzyme amylase to break down carbohydrates. The tongue then moves the food to the back of the mouth, where it can be swallowed. The mouth also plays a role in speech, and the palate separates the mouth from the nasal cavity, allowing separate passages for air and food.
The tongue is a muscle made up of eight interwoven muscles covered in receptors or taste buds. It is rooted at the back of the mouth and contains blood vessels, nerve bundles, and glands that secrete fluids found in saliva. The tongue is essential for moving food towards the teeth and eventually towards the throat, as well as playing a crucial role in speech.
The floor of the oral cavity is made up of the mylohyoid and geniohyoid muscles, which elevate the hyoid-laryngeal complex during swallowing. The superior border of the oral cavity includes the soft palate, which is made up of five different muscles: tensor veli palatini, musculus uvulae, levator veli palatini, palatopharyngeus, and palatoglossus. These muscles receive innervation from the pharyngeal branch of the vagus nerve, except for the tensor veli palatini, which is innervated by the mandibular branch of the trigeminal nerve.
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The tongue is a muscle
The tongue is indeed a muscle. In fact, it is made up of eight muscles, classified as either intrinsic or extrinsic. The four intrinsic muscles are responsible for altering the shape of the tongue and are not attached to any bone. The four extrinsic muscles, on the other hand, change the position of the tongue and are anchored to bone. These muscles include the genioglossus, the hyoglossus, the styloglossus, and the palatoglossus. The tongue is highly flexible due to its muscular composition and lack of supporting bone, allowing it to contort into various shapes and postures.
The tongue plays a crucial role in several functions, including digestion, taste perception, and speech. During the oral phase of swallowing, the tongue elevates and sweeps posteriorly, propelling food past the anterior tonsillar pillar and triggering the swallowing reflex. It also assists in manipulating sounds and words during speech, working in conjunction with the teeth and palate.
The tongue's involvement in taste perception is facilitated by the different taste and sensory innervation in its anterior and posterior portions. The anterior two-thirds of the tongue receive taste sensations from a branch of the facial nerve called the chorda tympani nerve, while the posterior one-third receives taste and sensory input from the glossopharyngeal nerve.
While some have speculated that the tongue is the strongest muscle in the body, this is a misconception. The tongue's strength lies in its agility and endurance rather than brute force. Its muscular architecture allows for redundancy, enabling it to activate different muscle fibres to achieve the same result without fatiguing.
The tongue's blood supply primarily comes from the lingual artery, a branch of the external carotid artery. The lingual veins then drain into the internal jugular vein. Additionally, there is a secondary blood supply to the root of the tongue from the tonsillar branch of the facial artery and the ascending pharyngeal artery.
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Lips are muscular structures
The mouth is an oval-shaped cavity inside the skull. It is also known as the oral cavity or buccal cavity. Parts of the mouth include the lips, vestibule, mouth cavity, gums, teeth, hard and soft palate, tongue, and salivary glands.
Lips are a pair of soft, movable, and muscular structures that form the entrance to the mouth. They are composed of a surface epidermis (skin), connective tissue, and a muscle layer. The edges of the lips are covered with reddish skin, sometimes called the vermilion border, and are abundantly provided with sensitive nerve endings. The reddish skin is a transition layer between the outer, hair-bearing tissue and the inner mucous membrane. The interior surface of the lips is lined with a moist mucous membrane. The upper and lower lips are known as the labium superius oris and labium inferius oris, respectively. The upper lip is characterised by a symmetrical pair of paramedian vertical philtral ridges bordering the central depression known as the philtrum, directly below the nasal septum.
The orbicularis oris muscle, a complex of muscles formerly thought to be a single sphincter or ring of muscle, supplies most of the substance of each lip. This muscle, along with others that radiate out into the cheeks, enables the lips' many variations in shape and expression. The orbicularis oris is also requisite for the closure of the mouth, chewing, and creating an oral seal. The nasolabial folds are formed by the insertion of the muscles responsible for lip elevation into the orbicularis oris. At the philtrum, the fibres of the orbicularis oris decussate to insert into the opposite philtral ridge. The perpendicular force vectors formed by the contraction of the orbicularis oris result in the generation of relaxed skin tension lines angled radially outward from the oral orifice.
The external carotid artery is the principal supplier of blood to the lips, via the facial artery giving rise to the superior and inferior labial arteries lateral to the angles of the mouth. The labial arteries are located within the submucosa of the vermilion-mucosa transitional area, deep to the orbicularis oris. Small distributaries branch superiorly and inferiorly from the labial arteries to supply the cutaneous portions of the upper and lower lips. Venous drainage of the lips occurs via the superior and inferior labial veins. Lymphatic drainage from the upper lip and lateral aspects of the lower lip is directed to the ipsilateral submandibular lymph nodes. The central portion of the lower lip drains into the submental nodes.
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The mouth has many functions
The mouth, or oral cavity, is an oval-shaped orifice through which food and air enter the body. It is surrounded by the lips and contains the tongue, palate, and teeth. The mouth is responsible for many functions, including eating, breathing, and speaking.
The mouth is made up of several different parts that work together to perform these functions. The lips are two muscular structures that form the entrance to the mouth. Inside the mouth, the tongue is a large muscle that helps with taste, swallowing, and moving food towards the teeth and throat. The tongue is also essential for speech. The palate, or roof of the mouth, separates the mouth from the nasal cavity, allowing separate passages for air and food. The teeth are the chief structures of the oral cavity and are used for tearing and grinding food into small pieces that can be easily swallowed.
The mouth also contains the salivary glands, which produce saliva to help with digestion. Saliva contains an enzyme called amylase, which breaks down carbohydrates into sugars. The vestibule is the area between the cheeks, teeth, and gums and it is kept moist by secretions from the salivary glands. The oral mucosa, or mucous membranes, line the mouth and help to keep it moist and clear of food debris.
Good oral hygiene is important for maintaining overall health and preventing conditions such as gingivitis, tooth decay, and oral cancer. Proper brushing, flossing, and regular dental check-ups can help reduce the risk of oral health issues.
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Oral cancers
The mouth, or oral cavity, is responsible for many functions, including eating, breathing, and speaking. It is the first portion of the digestive system, and food is ground up by the teeth and moistened with saliva, which contains an enzyme called amylase that breaks down carbohydrates into sugars. The tongue then moves the food into the throat, through the oesophagus, and into the stomach.
The vast majority of mouth cancers are squamous cell carcinomas (SCC), which constitute more than 90% of all oral cancers. Squamous cells are thin, flat cells that look like fish scales and are found in the tissue that forms the surface of the skin, the lining of the hollow organs of the body, and the lining of the respiratory and digestive tracts. SCC of the mouth is mainly caused by tobacco smoking and alcohol consumption. Tobacco contains carcinogenic molecules, and research has shown a direct link between the number of pack-years of tobacco and the risk of oral SCC.
Signs and symptoms of oral cancer can include sores or bumps that don't heal within two weeks, white or red patches inside the mouth or throat that may bleed when scraped, and rough spots or crusty areas on the lips, gums, or inside the mouth. It is important to note that 25% of people who develop oral cancer don't smoke or have other known risk factors, and good oral hygiene, regular dental check-ups, and a healthy lifestyle can help reduce the risk of oral cancer.
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Frequently asked questions
The mouth, or oral cavity, is the orifice through which food and air enter the body. It is the first portion of the digestive system.
The two main functions of the mouth are eating and speaking. The mouth is also used for breathing, although this is usually done through the nose.
The mouth consists of the lips, vestibule, mouth cavity, gums, teeth, hard and
Yes, the mouth contains several muscles. The tongue is made up of eight interwoven muscles and is attached to the floor of the mouth by the frenulum linguae. The soft palate is made up of five different muscles. There are also over 50 pairs of muscles that help us swallow our food.
