biology

Killian's dehiscence

Killian's dehiscence 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 Killian's dehiscence rather than just read about it. In short: Killian's dehiscence (also known as Killian's triangle) is a triangular area in the wall of the pharynx between the cricopharyngeus (upper esophageal sphincter (UES)) and thyropharyngeus (Inferior pharyngeal constrictor muscle) which are the two parts of the inferior constrictors (also see Pharyngeal pouch). It can be seen as a locus minoris resistentiae (place of low resistance).

Key takeaways

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

Reference excerpt

Killian's dehiscence (also known as Killian's triangle) is a triangular area in the wall of the pharynx between the cricopharyngeus (upper esophageal sphincter (UES)) and thyropharyngeus (Inferior pharyngeal constrictor muscle) which are the two parts of the inferior constrictors (also see Pharyngeal pouch). It can be seen as a locus minoris resistentiae (place of low resistance). A similar triangular area between circular fibres of the cricopharyngeus and longitudinal fibres of the esophagus is Lamier's triangle or Lamier-Hackermann's area.

Clinical significance It represents a potentially weak spot where a pharyngoesophageal diverticulum (Zenker's diverticulum) is more likely to occur.

Eponym It is named after the German ENT surgeon Gustav Killian.

References

Illustrations

Worked examples

Example 1 — a first encounter with Killian's dehiscence

Start with the simplest possible case. Write down what Killian's dehiscence 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 Killian's dehiscence 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 Killian's dehiscence 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 Killian's dehiscence

In research: Killian's dehiscence 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 Killian's dehiscence 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: Killian's dehiscence is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anatomy stubs, Human head and neck, Otorhinolaryngology, so understanding it makes those chapters shorter.
In everyday life: Look for Killian's dehiscence 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 Killian's dehiscence in 20 minutes

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

Frequently asked questions

What is Killian's dehiscence in simple terms?

Why does Killian's dehiscence 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 Killian's dehiscence?

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 Killian's dehiscence.