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Submandibular gland: want to learn more about it?

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Submandibular gland

The submandibular gland is the second of the three major head salivary glands, after the parotid and before the sublingual gland. It is situated both superiorly and inferiorly to the posterior aspect of the mandible in the submandibular triangle of the neck and makes up part of the floor of the oral cavity.

Borders

The mylohyoid muscle runs through the lobules of the gland and sections it off into superficial and deep parts. The superficial portion of the submandibular gland can be seen in the submandibular triangle of the neck and is covered by the investing layer of deep cervical fascia.

The deep portion of the submandibular gland is that which limits the inferior aspect of the oral cavity. It lies between the hyoglossus muscle and the mandible. It ends at the posterior border of the sublingual gland.

Submandibular gland location in a cadaver.

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Histology

This glandular mass is responsible for the production of 70% of the over salivary output. It secretes both serous and mucinous saliva, although the majority of it is serous, with a 3:2 ratio in it’s favor.

Submandibular gland (histological slide)

It’s duct, which connects the gland with the oral cavity proper is known as Wharton’s duct and opens at the lingual papilla, which can be found on either side of the lingual frenulum. It runs along the gland and is approximately four centimeters in length and between two and four millimeters wide.

Submandibular duct

Blood supply

The facial and lingual arteries contribute to the blood supply of the submandibular gland and in turn their venous drainage is provided by the corresponding veins.

Facial artery

Innervation

The secretory mechanism of the submandibular gland is regulated directly by the parasympathetic nervous system by which it is stimulated, and indirectly by the sympathetic nervous system by which it is inhibited.

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These exact fibers include presynaptic fibers from the facial nerve (CN VII) via the chorda tympani to the submandibular ganglion and postsynaptic fibers from cells in the submandibular ganglion that together make up the parasympathetic secretomotor fibers. The vasoconstrictive sympathetic fibers stir from the superior cervical ganglion.

Submandibular ganglion (lateral-left view)

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Submandibular gland: want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

What do you prefer to learn with?

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

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