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McBurney's point

McBurney's point 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 McBurney's point rather than just read about it. In short: McBurney's point is the point over the right side of the abdomen that is one-third of the distance from the anterior superior iliac spine to the umbilicus (navel). This is near the most common location of the appendix.

McBurney's point — main illustration
McBurney's point — illustration

Key takeaways

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

Reference excerpt

McBurney's point is the point over the right side of the abdomen that is one-third of the distance from the anterior superior iliac spine to the umbilicus (navel). This is near the most common location of the appendix.

Location McBurney's point is located one third of the distance from the right anterior superior iliac spine to the umbilicus (navel). This point roughly corresponds to the most common location of the base of the appendix, where it is attached to the cecum.

Appendicitis Deep tenderness at McBurney's point, known as McBurney's sign, is a sign of acute appendicitis. The clinical sign of referred pain in the epigastrium when pressure is applied is also known as Aaron's sign. Specific localization of tenderness to McBurney's point indicates that inflammation is no longer limited to the lumen of the bowel (which localizes pain poorly), and is irritating the lining of the peritoneum at the place where the peritoneum comes into contact with the appendix. Tenderness at McBurney's point suggests the evolution of acute appendicitis to a later stage, and thus, the increased likelihood of rupture. Other abdominal processes can also sometimes cause tenderness at McBurney's point. Thus, this sign is highly useful but neither necessary nor sufficient to make a diagnosis of acute appendicitis. The anatomical position of the appendix is highly variable (for example in retrocaecal appendix, an appendix behind the caecum), which also limits the use of this sign, as many cases of appendicitis do not cause point tenderness at McBurney's point. For most open appendectomies (as opposed to laparoscopic appendectomies), the incision is made at McBurney's point.

Pseudoaneurysm A pseudoaneurysm in the aorta may be treated surgically, with an incision made between McBurney's point and the lower intercostal spaces.

Peritoneal dialysis McBurney's point may be a useful site for insertion of a peritoneal dialysis catheter.

History McBurney's point is named after American surgeon Charles McBurney (1845–1913). McBurney himself did not locate his point in a precise way in his original article.

The seat of greatest pain, determined by the pressure of one finger, has been very exactly between an inch and a half and two inches from the anterior spinous process of the ilium on a straight line drawn from that process to the umbilicus

References

Bibliography Naraynsingh V, Ramdass MJ, Singh J, Singh-Rampaul R, Maharaj D (2003). "McBurney's point: are we missing it?". Surgical and Radiologic Anatomy. 24 (6): 363–5. doi:10.1007/s00276-002-0069-7. PMID 12652363. S2CID 43595987.

External links

Illustrations

McBurney's point illustration
McBurney's point illustration
McBurney's point: Normal location of the appendix relative to other organs of the digestive system (anterior view). Cecum and appendix are visible at bottom left.
Normal location of the appendix relative to other organs of the digestive system (anterior view). Cecum and appendix are visible at bottom left.

Worked examples

Example 1 — a first encounter with McBurney's point

Start with the simplest possible case. Write down what McBurney's point 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 McBurney's point 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 McBurney's point 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 McBurney's point

In research
McBurney's point 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 McBurney's point 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
McBurney's point is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diagnostic surgery, Medical signs, so understanding it makes those chapters shorter.
In everyday life
Look for McBurney's point 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 McBurney's point in 20 minutes

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

Frequently asked questions

What is McBurney's point in simple terms?

McBurney's point is the point over the right side of the abdomen that is one-third of the distance from the anterior superior iliac spine to the umbilicus (navel). This is near the most common location of the appendix.

Why does McBurney's point 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 McBurney's point?

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 McBurney's point.

Tags

  • Diagnostic surgery
  • Medical signs

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