biology

Posterior superior alveolar nerve

Posterior superior alveolar nerve is a biology 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 Posterior superior alveolar nerve rather than just read about it. In short: The posterior superior alveolar nerves (also posterior superior dental nerves or posterior superior alveolar branches) are sensory branches of the maxillary nerve (CN V2). They arise within the pterygopalatine fossa as a single trunk.

Key takeaways

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

Reference excerpt

The posterior superior alveolar nerves (also posterior superior dental nerves or posterior superior alveolar branches) are sensory branches of the maxillary nerve (CN V2). They arise within the pterygopalatine fossa as a single trunk. They run on or in the maxilla. They provide sensory innervation to the upper molar teeth and adjacent gum, and the maxillary sinus.

Anatomy

Origin The nerves arise from the trunk of the maxillary nerve (CN V2) within the pterygopalatine fossa just before it enters the infraorbital groove. The nerve arises as a single trunk which split into 2-3 nerves within the pterygopalatine fossa.

Course The nerves exit the pterygopalatine fossa through the pterygomaxillary fissure. They pass within or upon the posterior wall of the maxilla. They descend on the tuberosity of the maxilla and give off several twigs to the gums and neighboring parts of the mucous membrane of the cheek. They then enter the alveolar canals on the infratemporal surface of the maxilla, and, passing from behind forward in the substance of the bone, communicate with the middle superior alveolar nerve, and give off branches to the lining membrane of the maxillary sinus and gingival and dental branches to each molar tooth from a superior dental plexus; these branches enter the apical foramina at the roots of the teeth.

Distribution The nerves provide sensory innervation to the upper/maxillary molar teeth and the associated gingiva of the vestibule, and the maxillary sinus.

Teeth The nerve innervates the second and third maxillary/upper molar teeth, and two of the three roots of the maxillary/upper first molar tooth (all but the mesiobuccal root).

Clinical significance When giving a posterior superior alveolar nerve block, it will anesthetize the mesialbuccal root of the maxillary/upper first molar tooth approximately 72% of the time.

See also Alveolar nerve (Dental nerve) Superior alveolar nerve (Superior dental nerve) Anterior superior alveolar nerve (Anterior superior dental nerve) Middle superior alveolar nerve (Middle superior dental nerve) Inferior alveolar nerve (Inferior dental nerve)

Additional images

References

This article incorporates text in the public domain from page 890 of the 20th edition of Gray's Anatomy (1918)

External links cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (V) lesson9 at The Anatomy Lesson by Wesley Norman (Georgetown University) (latnasalwall4) MedEd at Loyola GrossAnatomy/h_n/cn/cn1/cnb2.htm

Illustrations

Worked examples

Example 1 — a first encounter with Posterior superior alveolar nerve

Start with the simplest possible case. Write down what Posterior superior alveolar nerve claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Posterior superior alveolar 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 Posterior superior alveolar 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 Posterior superior alveolar nerve

In research: Posterior superior alveolar nerve appears in biology 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 Posterior superior alveolar 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: Posterior superior alveolar nerve is common in secondary-school and first-year university syllabi. It links to neighbouring topics Maxillary nerve, Neuroanatomy stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Posterior superior alveolar 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 Posterior superior alveolar nerve in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Posterior superior alveolar 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 Posterior superior alveolar nerve out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Posterior superior alveolar nerve in simple terms?

Why does Posterior superior alveolar nerve matter?

Because it connects several biology 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 Posterior superior alveolar 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 Posterior superior alveolar nerve.