What Are the Structure Types and Functions of Salivary Glands
The largest gland in human body, most essential and the major are salivary glands. They secrete a major amount of saliva in our mouths. It is better if you know a little bit in detail about the salivary glands, which can help you to speak to your doctor about aspects of care and surgery treatments in case you have been diagnosed with salivary gland cancer. Through particular openings called ducts, the salivary glands empty the juice into your mouth. The main function of saliva is to help in acts of chewing and swallowing. Your throat and mouth can develop several types of infections which can be prevented by the help of saliva. Mainly there are two types of salivary glands known as the major and minor glands.
The Major Salivary Glands
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The most essential and largest gland in human body related to saliva is the major salivary glands. The maximum amount of saliva is produced by these glands of the body itself. The sublingual glands, the submandibular glands, and the parotid glands from the major salivary glands of our system. Now, let’s talk about each of these glands in detail and know the structure of salivary gland.
What are the Functionality of the Parotid Gland?
The location of the parotid glands is right in front of the ears and are essentially the largest salivary glands of our body. Close to your upper second molar, there is a duct that secretes the saliva produced in the parotid glands directly into the mouth. The deep lobe and the superficial lobe are the two different parts of a parotid gland. The facial nerve lies in between these two lobes. This novel is essential for your body as it controls the ability to smile, raise your eyebrows and close your eyes.
The main blood supplier of the neck and head region is the external carotid artery which is another critical structure that lies near the parotid glands. Even a branch of the jugular vein known as the retromandibular vein lies near the gland. Parotidectomy is the surgery performed to treat a tumour in the parotid gland. This surgery requires great precision as the surgeon needs to open up and perform the surgery near the essential structure of salivary gland and veins.
What Do You Mean By the Submandibular Gland?
Below the jaw, we have the submandibular gland, which is about the size of a walnut. There are places on the tongue from where saliva produced in these glands is secreted directly into the mouth through a duct of submandibular gland. This gland also has a deep lobe and the superficial lobe, just like the parotid gland. The marginal mandibular nerve, which helps you in smiling, is a nearby structure.
Other than that, the muscle which helps you to move your lower lip or the platysma muscle along with the lingual nerve, which allows you to feel all the sensation near your tongue, is located near these glands. A portion of your tongue that helps in swallowing and speech has restricted movements. These movements are allowed by the hypoglossal nerve, which is also located in the same region. The entire structure of salivary gland should be known to you, and nearby structures must be protected during treatment or surgery to avoid any unnecessary damage.
Role of the Sublingual Glands
These are the smallest in size amongst all the major salivary glands, as the rest form amongst the largest gland in human body related to saliva. Below either side of the tongue and under the mouth floor, we have these two almond-shaped structures located. These glands are usually safe from having any tumour or cancer. Malignancy in these glands is very rare, even in the case of tumours.
The Minor Salivary Glands
Throughout the aerodigestive tract and the mouth, there are hundreds and plenty of minor Salivary Glands secreting saliva. These glands are practically invisible without a microscope, unlike the major salivary glands, which are visible. Most of them are found in the face anatomy region like the mouth palate, roof, tongue area, and lining of the lips. The other areas are inside the nose, the cheeks, the voice box or larynx, and sinuses. Tumours in these minor salivary glands are pretty rare, but they are more open to cancers than tumours. Usually, it is the roof of the mouth where the minor salivary gland cancer begins.
FAQs on Salivary Glands Anatomy Structure and Role in Digestion
1. What are salivary glands?
Salivary glands are exocrine glands that produce and secrete saliva into the oral cavity to aid digestion and maintain oral health.
- They release saliva through ducts into the mouth.
- Saliva contains water, mucus, enzymes, and antimicrobial substances.
- They play a key role in lubrication, digestion, and protection of teeth and mucosa.
2. What are the three major salivary glands in humans?
The three major salivary glands are the parotid, submandibular, and sublingual glands.
- Parotid glands: Largest; located near the ears; mainly serous secretion.
- Submandibular glands: Below the lower jaw; mixed serous and mucous secretion.
- Sublingual glands: Beneath the tongue; primarily mucous secretion.
3. What is the function of salivary glands?
The main function of salivary glands is to produce saliva that lubricates food and begins chemical digestion.
- Initiates carbohydrate digestion via salivary amylase.
- Moistens food to form a bolus for swallowing.
- Protects teeth with buffering agents and antimicrobial proteins like lysozyme.
4. How does saliva help in digestion?
Saliva helps digestion by mechanically moistening food and chemically breaking down starch using salivary amylase.
- Water softens and dissolves food particles.
- Salivary amylase converts starch into maltose and dextrins.
- Mucus eases swallowing by forming a cohesive bolus.
5. What is the structure of a salivary gland?
A salivary gland is composed of secretory units called acini and a branching duct system.
- Serous acini: Produce watery, enzyme-rich secretion.
- Mucous acini: Produce mucus-rich secretion.
- Ducts (intercalated, striated, excretory) modify and transport saliva to the mouth.
6. What is the difference between serous and mucous salivary glands?
Serous glands secrete watery, enzyme-rich fluid, while mucous glands secrete thick, mucus-rich fluid.
- Serous secretion: Contains enzymes like amylase; thin and watery (e.g., parotid gland).
- Mucous secretion: Rich in mucin; thick and lubricating (e.g., sublingual gland).
- Some glands, like the submandibular gland, are mixed.
7. How is salivary secretion regulated?
Salivary secretion is regulated by the autonomic nervous system, especially the parasympathetic division.
- Parasympathetic stimulation: Produces copious, watery saliva.
- Sympathetic stimulation: Produces smaller amounts of thicker saliva.
- Stimuli include smell, taste, chewing, and even thought of food.
8. What is the composition of saliva?
Saliva is mainly water but also contains enzymes, mucus, electrolytes, and antimicrobial substances.
- About 99% water.
- Enzymes such as salivary amylase and lingual lipase.
- Mucin for lubrication.
- Ions like sodium, potassium, bicarbonate, and chloride.
9. What are minor salivary glands?
Minor salivary glands are numerous small glands scattered throughout the oral mucosa that continuously secrete small amounts of saliva.
- Located in the lips, cheeks, palate, and tongue.
- Mostly mucous in nature.
- Help keep the mouth moist between meals.
10. Why are salivary glands important for oral health?
Salivary glands are essential for oral health because saliva protects teeth, controls microbes, and maintains pH balance.
- Bicarbonate ions buffer acids produced by bacteria.
- Antimicrobial proteins like lysozyme and IgA reduce infections.
- Saliva helps remineralize enamel with calcium and phosphate ions.
