biology

Solitary tract

Solitary tract 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 Solitary tract rather than just read about it. In short: The solitary tract (tractus solitarius or fasciculus solitarius) is a compact fiber bundle that extends longitudinally through the posterolateral region of the medulla oblongata. The solitary tract is surrounded by the solitary nucleus, and descends to the upper cervical segments of the spinal cord.

Key takeaways

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

Reference excerpt

The solitary tract (tractus solitarius or fasciculus solitarius) is a compact fiber bundle that extends longitudinally through the posterolateral region of the medulla oblongata. The solitary tract is surrounded by the solitary nucleus, and descends to the upper cervical segments of the spinal cord. It was first named by Theodor Meynert in 1872.

Composition The solitary tract is made up of primary sensory fibers and descending fibers of the vagus, glossopharyngeal, and facial nerves.

Function The solitary tract conveys afferent information from stretch receptors and chemoreceptors in the walls of the cardiovascular, respiratory, and intestinal tracts. Afferent fibers from cranial nerves 7, 9 and 10 convey taste (SVA) in its rostral portion, and general visceral sense (general visceral afferent fibers, GVA) in its caudal part. Taste buds in the mucosa of the tongue can also generate impulses in the rostral regions of the solitary tract. The efferent fibers are distributed to the solitary tract nucleus.

Synonyms There are numerous synonyms for the solitary tract:

round fasciculus (Latin: fasciculus rotundus) solitary fasciculus (Latin: fasciculus solitarius) solitary bundle (Latin: funiculus solitarius) Gierke respiratory bundle (Named for German anatomist Hans Paul Bernhard Gierke). Krause respiratory bundle (Named for German anatomist Johann Friedrich Wilhelm Krause).

References Stedman, Thomas Lathrop (2006). Stedman's Medical Dictionary, 28th edition. Baltimore, MD: Lippincott Williams & Wilkins. p. 2011. ISBN 0-7817-3390-1.

Illustrations

Worked examples

Example 1 — a first encounter with Solitary tract

Start with the simplest possible case. Write down what Solitary tract 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 Solitary tract 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 Solitary tract 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 Solitary tract

In research: Solitary tract 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 Solitary tract 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: Solitary tract is common in secondary-school and first-year university syllabi. It links to neighbouring topics Facial nerve, Glossopharyngeal nerve, Gustatory system, so understanding it makes those chapters shorter.
In everyday life: Look for Solitary tract 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 Solitary tract in 20 minutes

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

Frequently asked questions

What is Solitary tract in simple terms?

Why does Solitary tract 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 Solitary tract?

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 Solitary tract.