science

Lingual nerve

Lingual nerve is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lingual nerve rather than just read about it. In short: The lingual nerve carries sensory innervation from the anterior two-thirds of the tongue. It contains fibres from both the mandibular division of the trigeminal nerve (CN V3) and from the facial nerve (CN VII).

Key takeaways

Lingual nerve belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lingual nerve to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lingual nerve from memory before moving on to harder problems.

Reference excerpt

The lingual nerve carries sensory innervation from the anterior two-thirds of the tongue. It contains fibres from both the mandibular division of the trigeminal nerve (CN V3) and from the facial nerve (CN VII). The fibres from the trigeminal nerve are for touch, pain and temperature (general sensation), and the ones from the facial nerve are for taste (special sensation).

Structure

Origin The lingual nerve arises from the posterior trunk of mandibular nerve (CN V3) within the infratemporal fossa.

Course The lingual nerve first courses deep to the lateral pterygoid muscle and superior to the tensor veli palatini muscle; while passing between these two muscle, it is joined by the chorda tympani, and often by a communicating branch from the inferior alveolar nerve. The nerve then comes to pass inferoanteriorly upon the medial pterygoid muscle towards the medial aspect of the ramus of mandible, eventually meeting the mandible at the junction of the ramus and body of mandible. Here, the lingual nerve is anterior and somewhat medial (deep) to the inferior alveolar nerve. It crosses obliquely to the side of the tongue beneath the constrictor pharyngis superior and styloglossus, and then between the hyoglossus and deep part of the submandibular gland; it finally runs from laterally to medially inferiorly crossing the duct of the submandibular gland, and along the tongue to its tip becoming the sublingual nerve, lying immediately beneath the mucous membrane. The submandibular ganglion is suspended by two nerve filaments from the lingual nerve.

Distribution

General sensory The lingual nerve supplies general somatic afferent (i.e. general sensory) innervation to the mucous membrane of the anterior two-thirds of the tongue (i.e. body of tongue) (whereas the posterior one-third (i.e. root of tongue) is innervated via the glossopharyngeal nerve (CN IX)), the floor of the oral cavity, and the mandibular/inferior lingual gingiva.

Special sensory and parasymathetic autonomic The lingual nerve also comes to convey fibres of the chorda tympani (which are derived from the facial nerve (CN VII)), which provide special sensation (taste) to the anterior two-thirds of the tongue as well as parasympathetic and sympathetic innervation.

Clinical significance

Lingual nerve injuries The most common cause of lingual nerve injuries is third molar (wisdom tooth) surgery, less commonly the lingual nerve can be injured by local anaesthetic dental injections (particularly inferior dental block injections) and sublingual or submandibular surgery. Any injury to sensory nerves can result in pain, altered sensation and/or numbness, but usually a combination of all three symptoms arises. This can have a significant negative effect on the patient's quality of life affecting their daily function and psychological health. Patients should be routinely warned about lingual nerve injuries prior to wisdom tooth and floor of mouth surgery. The risk associated with wisdom tooth surgery is commonly accepted to be 2% temporary and 0.2% permanent. Warning patients of nerve injury prior to administration of deep dental injections has a risk of injury in approximately 1:14,000 with 25% of these remaining persistent. Preoperative warning about these injuries is routinely undertaken in the US and Germany. This reflects good practice recommended by the Royal College of Anaesthetists (prior warning of potential nerve injury in relation to spinal and epidural blocks 1 on 24–57,000 risk). Infiltration dentistry is a technique that may reduce the possibility of lingual nerve injuries by avoiding deep injections. Avoiding lingual access when undertaking wisdom tooth surgery will also avoid unnecessary lingual nerve injury

See also Lingual branches of hypoglossal nerve

Additional images

References This article incorporates text in the public domain from page 895 of the 20th edition of Gray's Anatomy (1918)

External links Anatomy figure: 27:03-05 at Human Anatomy Online, SUNY Downstate Medical Center MedEd at Loyola GrossAnatomy/h_n/cn/cn1/cnb3.htm lesson4 at The Anatomy Lesson by Wesley Norman (Georgetown University) (mandibularnerve) cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (V) "Anatomy diagram: 05287.011-1". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2013-04-22.

Illustrations

Worked examples

Example 1 — a first encounter with Lingual nerve

Start with the simplest possible case. Write down what Lingual nerve claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lingual nerve before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lingual nerve ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lingual nerve

In research: Lingual nerve appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lingual nerve in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lingual nerve is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gustatory system, Innervation of the tongue, Mandibular nerve, so understanding it makes those chapters shorter.
In everyday life: Look for Lingual nerve outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lingual nerve in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lingual nerve means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lingual nerve out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lingual nerve in simple terms?

Why does Lingual nerve matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lingual nerve?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lingual nerve.