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extensor

C2
UK/ɪkˈstensə(r)/US/ɪkˈstɛnsər/

Technical / Scientific / Medical

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Definition

Meaning

A muscle that straightens or extends a limb or part of the body.

Any anatomical structure (typically a muscle, but also a tendon or nerve) that serves to straighten a joint or move a body part away from its flexed position. In broader contexts, can metaphorically refer to a device or mechanism that causes extension.

Linguistics

Semantic Notes

Primarily used in anatomical and physiological contexts. Rarely, if ever, used in everyday conversation. The plural is 'extensors'. The complementary term is 'flexor'.

Dialectal Variation

British vs American Usage

Differences

No significant differences in meaning or usage. Spelling and pronunciation are consistent.

Connotations

Purely technical and neutral in both dialects.

Frequency

Equally low-frequency and specialised in both varieties.

Vocabulary

Collocations

strong
extensor muscleextensor tendonextensor digitorumwrist extensorextensor carpi radialisfinger extensorextensor hallucis longusknee extensor
medium
extensor mechanismextensor surfaceextensor lagextensor compartmentpowerful extensorprimary extensor
weak
injured extensordamaged extensorfunction of the extensorpain in the extensor

Grammar

Valency Patterns

[Extensor] + of + [body part] (e.g., extensor of the wrist)[Injury/Strain/Tear] + to + the [extensor] (e.g., tear to the finger extensor)[The extensor] + is + [injured/strengthened]

Vocabulary

Synonyms

Strong

antagonist (to a flexor)extending muscle

Neutral

straightening muscle

Vocabulary

Antonyms

flexorbending muscle

Usage

Context Usage

Business

Not used.

Academic

Used in anatomy, physiology, biology, and sports science textbooks and lectures.

Everyday

Virtually never used. A layperson might say 'the muscle that straightens your finger'.

Technical

Core term in medical, physiotherapy, kinesiology, and biomechanics contexts. Used in diagnoses, surgical reports, and rehabilitation plans.

Examples

By Part of Speech

adjective

British English

  • The extensor tendons run along the back of the hand.
  • She focused on strengthening her extensor muscles.

American English

  • The extensor mechanism of the knee is complex.
  • He suffered an extensor tendon laceration.

Examples

By CEFR Level

B2
  • Tennis players often have very strong wrist extensors.
  • The physiotherapist told me to work on my knee extensors.
C1
  • The extensor digitorum communis muscle extends the fingers at the metacarpophalangeal joints.
  • A rupture of the central slip of the extensor tendon can lead to a Boutonnière deformity.

Learning

Memory Aids

Mnemonic

Think 'EXTEND-sor' - it helps EXTEND your arm or leg, straightening it out.

Conceptual Metaphor

AN EXTENSION IS STRAIGHTENING. The body is viewed as a machine with levers (bones) and cables (muscles) that pull to create movement.

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • The Russian cognate 'экстензор' is highly specialised and not common. The more typical translation is 'разгибатель' (razgibatel').

Common Mistakes

  • Confusing 'extensor' with 'extender' (a general device for making something longer).
  • Mispronouncing it as 'ex-TEN-sor' (the stress is on the second syllable).

Practice

Quiz

Fill in the gap
After lifting heavy boxes, he felt a sharp pain in his wrist .
Multiple Choice

What is the primary function of an extensor muscle?

FAQ

Frequently Asked Questions

It is primarily a noun (e.g., 'an extensor'). It can also function attributively as an adjective (e.g., 'extensor tendon'). It is not a verb.

It is highly unlikely and would sound very technical. In everyday situations, people describe the function (e.g., 'the muscle that straightens your arm') rather than using the anatomical term.

The direct anatomical opposite is 'flexor'. A flexor muscle bends a joint, while an extensor straightens it.

Yes, the spelling is identical in both major dialects.