Submandibular glands

The submandibular glands are a pair of major salivary glands beneath the jaw that produce much of the saliva in the mouth. In Anatomy and Physiology I, they matter because they start digestion and keep oral tissues moist and healthy.

What are the submandibular glands?

The submandibular glands are the paired major salivary glands located beneath the floor of the mouth, tucked just under the jaw. In Anatomy and Physiology I, you usually see them as one of the three major salivary glands, along with the parotid and sublingual glands.

Their job is to make and release saliva into the oral cavity. That saliva is not just water. It contains mucus for lubrication, electrolytes that help maintain a normal oral environment, and digestive enzymes such as amylase that begin chemical digestion right away. Because of that mix, submandibular saliva helps you chew, form a bolus, and swallow without scraping the tissues in your mouth.

A lot of the saliva you use every day comes from these glands. They contribute a large share of resting saliva, which is the saliva that keeps your mouth from drying out between meals. That matters because a moist mouth protects the buccal mucosa, helps wash away food debris, and supports normal speech and swallowing.

The saliva leaves each gland through a duct system, and the main duct you usually learn is Wharton's duct. It carries secretions from the gland into the floor of the mouth near the tongue. In a body structure lab, you may need to identify the gland by its position below the mandible or trace the duct opening on a diagram.

These glands are also a good example of how structure and function fit together. Their location under the jaw lets them drain efficiently into the mouth, and their mixed secretion is especially useful during everyday eating. If a duct gets blocked or the gland becomes inflamed, saliva flow drops and you can get dry mouth, pain, or a salivary stone.

Why the submandibular glands matter in Anatomy and Physiology I

The submandibular glands show up whenever your course connects anatomy to digestion and oral health. They are not just a name to memorize, they explain why the mouth can start processing food before anything reaches the stomach.

If saliva production drops, the effects show up fast. Chewing feels harder, the tongue and cheeks can stick to dry surfaces, and swallowing may become uncomfortable. That makes this term useful for understanding xerostomia, mouth infections, and salivary stones, which are common examples tied to gland obstruction or dysfunction.

This term also helps you connect several systems at once. The digestive system uses saliva to begin breaking down food, while the oral cavity depends on saliva to protect tissues and keep the environment stable. So when you learn the submandibular glands, you are really learning how one organ supports both digestion and homeostasis in the mouth.

In lab images and anatomy questions, this is a location-based term. If you can place the gland under the mandible and connect it to Wharton's duct, you are already doing the kind of identification work that shows up in A&P quizzes, diagrams, and practicals.

How the submandibular glands connect across the course

Salivary Glands

The submandibular glands are one of the three major salivary gland pairs. Comparing them with the parotid and sublingual glands helps you see how different glands contribute different amounts and types of saliva. In anatomy questions, this relationship often shows up as a location-and-function identification task.

Saliva

The glands matter because they produce saliva, and saliva is what starts the mouth phase of digestion. Submandibular saliva is especially useful for lubricating food and protecting oral tissues. When saliva production changes, you can trace the effect back to swallowing, speech, and oral comfort.

Ducts

The secretions from the submandibular glands leave through ducts, especially Wharton's duct. That makes ducts the transport route between gland tissue and the oral cavity. If a duct is blocked, the gland can still make saliva but cannot deliver it normally, which is why obstruction causes swelling or pain.

Amylase

Amylase is one of the enzymes found in saliva, so it connects directly to the glands that make that secretion. Its job is to begin carbohydrate digestion in the mouth. When you pair amylase with the submandibular glands, you can explain both mechanical chewing and early chemical digestion in one answer.

Are the submandibular glands on the Anatomy and Physiology I exam?

A quiz or lab practical may ask you to identify the submandibular glands on a head-and-neck diagram, place them beneath the mandible, or match them with Wharton's duct. Short-answer questions may ask what they secrete and why saliva matters for digestion and oral health. You might also get a case question about dry mouth, a blocked salivary duct, or pain near the jaw and have to connect the symptom to reduced saliva flow. If your instructor uses clinical examples, this term can also appear in a question about salivary stones or inflammation. The move is simple: name the gland, locate it, and explain what happens when saliva does or does not reach the mouth.

The submandibular glands vs Sublingual Glands

Submandibular glands sit below the mandible, while sublingual glands sit under the tongue. Both are major salivary glands, so they are easy to mix up on diagrams. The best way to tell them apart is by location first, then by the duct openings and the relative amount of saliva they produce.

Key things to remember about the submandibular glands

• The submandibular glands are paired salivary glands under the jaw that release saliva into the mouth.

• They produce a large share of resting saliva, which keeps the oral cavity moist between meals.

• Their saliva contains mucus and enzymes, so it helps both lubrication and the first steps of digestion.

• Wharton's duct carries their secretion into the floor of the mouth near the tongue.

• Blocked or inflamed submandibular glands can cause dry mouth, swelling, pain, or salivary stones.

Frequently asked questions about the submandibular glands

What are submandibular glands in Anatomy and Physiology I?

They are a pair of major salivary glands located beneath the mandible, in the floor of the mouth. They make saliva that helps start digestion and keeps the mouth lubricated and protected.

Where are the submandibular glands located?

They sit below the floor of the mouth, just under the jawbone. On diagrams, look for paired glands beneath the mandible with ducts that run toward the mouth.

What is the difference between submandibular and sublingual glands?

Submandibular glands are under the jaw, while sublingual glands are under the tongue. Both produce saliva, but they are different structures and are identified mainly by their location in the oral cavity.

What happens if the submandibular glands are blocked?

If saliva cannot flow through the duct normally, the mouth can become dry and the gland may swell or hurt. Blockage can also lead to salivary stones or infection because saliva is not draining the way it should.