science

Tendon reflex

Tendon reflex 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 Tendon reflex rather than just read about it. In short: Tendon reflex (or T-reflex) may refer to: The stretch reflex or muscle stretch reflex (MSR), when the stretch is created by a blow upon a muscle tendon. This is the commonly used definition of the term.

Key takeaways

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

Reference excerpt

Tendon reflex (or T-reflex) may refer to:

The stretch reflex or muscle stretch reflex (MSR), when the stretch is created by a blow upon a muscle tendon. This is the commonly used definition of the term. Albeit a misnomer, in this sense a common example is the standard patellar reflex or knee-jerk response. Stretch reflex tests are used to determine the integrity of the spinal cord and peripheral nervous system, and they can be used to determine the presence of a neuromuscular disease. The term "deep tendon reflex", if it refers to the muscle stretch reflex, is a misnomer. "Tendons have little to do with the response, other than being responsible for mechanically transmitting the sudden stretch from the reflex hammer to the muscle spindle. In addition, some muscles with stretch reflexes have no tendons (e.g., "jaw jerk" of the masseter muscle)". The Golgi tendon reflex, which is a reflex to extensive tension on a tendon; it functions to protect musculoskeletal integrity. The sensory receptors for this reflex are anatomically located deep in the tendon, while the sensory receptors for the MSR are inside the muscle. Therefore, the Golgi tendon reflex can be referred to as the deep tendon reflex.

Testing As wrongfully referring to a muscle stretch reflex, to test the reflex, tap on the tendon. In a healthy individual the intensity on both sides is equal. This means that the connections between the spinal cord and the muscles are undamaged. Main spinal nerve roots involved:

Biceps (C5, C6) Brachioradialis (C6) Triceps (C7) Patellar (L4) Achilles tendon (S1)

Functions of Golgi tendon reflex The Golgi tendon reflex is a response to extensive tension on a tendon. It helps avoid strong muscle contractions which could tear the tendon from either the muscle or bone. In sports, quick movements can damage the tendon before the reflex can occur. The tendon reflex also helps spread the workload more evenly over the entire muscle by preventing "muscle fibers connected with overstimulated tendon organs so that their contraction is more comparable to the contraction of the rest of the muscle."

References

External links "Tendon reflex" at Dorland's Medical Dictionary Reflex,+Tendon at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Kenneth Walker, H (1990). "Deep Tendon Reflexes". In Kenneth Walker, H; Dallas Hall, W; Willis Hurst, J (eds.). Clinical Methods: The History, Physical, and Laboratory Examinations (3rd ed.). Boston: Butterworths. ISBN 0-409-90077-X. PMID 21250237.

Worked examples

Example 1 — a first encounter with Tendon reflex

Start with the simplest possible case. Write down what Tendon reflex 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 Tendon reflex 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 Tendon reflex 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 Tendon reflex

In research: Tendon reflex 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 Tendon reflex 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: Tendon reflex is common in secondary-school and first-year university syllabi. It links to neighbouring topics Reflexes, so understanding it makes those chapters shorter.
In everyday life: Look for Tendon reflex 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 Tendon reflex in 20 minutes

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

Frequently asked questions

What is Tendon reflex in simple terms?

Tendon reflex (or T-reflex) may refer to: The stretch reflex or muscle stretch reflex (MSR), when the stretch is created by a blow upon a muscle tendon. This is the commonly used definition of the term.

Why does Tendon reflex 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 Tendon reflex?

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 Tendon reflex.