biology

Mees' lines

Mees' lines 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 Mees' lines rather than just read about it. In short: Mees' lines or Aldrich–Mees lines, also called leukonychia striata, are white lines of discoloration across the nails of the fingers and toes. Presentation They are typically white bands traversing the width of the nail.

Key takeaways

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

Reference excerpt

Mees' lines or Aldrich–Mees lines, also called leukonychia striata, are white lines of discoloration across the nails of the fingers and toes.

Presentation They are typically white bands traversing the width of the nail. As the nail grows they move towards the end, and finally disappear when trimmed.

Causes Mees' lines can look similar to injury to the nail, which should not be confused with true Mees' lines. Mees' lines appear after an episode of poisoning with arsenic, thallium or other heavy metals or selenium, opioid MT-45, and can also appear if the subject is suffering from kidney failure. They have been observed in chemotherapy patients.

Eponym and history Although the phenomenon is named after Dutch physician R. A. Mees, who described the abnormality in 1919, earlier descriptions of the same abnormality were made by Englishman E. S. Reynolds in 1901 and by American C. J. Aldrich in 1904.

See also Leukonychia List of cutaneous conditions Muehrcke's nails – a similar condition, except the lines are underneath the nails and so do not move as the nail grows

References

External links

Illustrations

Worked examples

Example 1 — a first encounter with Mees' lines

Start with the simplest possible case. Write down what Mees' lines 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 Mees' lines 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 Mees' lines 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 Mees' lines

In research: Mees' lines 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 Mees' lines 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: Mees' lines is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anatomy named for one who described it, Conditions of the skin appendages, Nails (anatomy), so understanding it makes those chapters shorter.
In everyday life: Look for Mees' lines 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 Mees' lines in 20 minutes

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

Frequently asked questions

What is Mees' lines in simple terms?

Mees' lines or Aldrich–Mees lines, also called leukonychia striata, are white lines of discoloration across the nails of the fingers and toes. Presentation They are typically white bands traversing the width of the nail.

Why does Mees' lines 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 Mees' lines?

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 Mees' lines.