Extensor definition

ĭk-stĕnsər
extensors
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Frequency:
A muscle that extends or straightens a limb or body part.
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A muscle that extends or straightens some part of the body, esp. a flexed arm or leg.
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A muscle that extends or straightens a limb or body part.
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A muscle that extends or straightens a limb or joint.
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(anatomy) A muscle whose contraction extends or straightens a limb or body part.
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Other Word Forms

Noun

Singular:
extensor
Plural:
extensors

Origin of extensor

  • New Latin extēnsor from Latin extēnsus past participle of extendere to stretch out extend

    From American Heritage Dictionary of the English Language, 5th Edition

Extensor Sentence Examples

  • This runs down the anterior and outer side of the upper arm, and is attached to the proximal tendon of the extensor metacarpi radialis longus, a little below the outer condyle of the humerus.

  • It is a brief extension of the limb at the knee-joint, due to a simple contraction of the extensor muscle, elicited by a tap or other short mechanical stimulus applied to the muscle fibres through the tendon of the muscle.

  • If the sensory nerves of the extensor muscle be severed, the "jerk" is lost.

  • Stretching of the muscles antagonistic to the extensors - namely, of the flexor muscles - reduces the jerk by inhibiting the extensor spinal nerve cells through the nervous impulses generated by the tense flexor muscles.

  • The motor cells of the extensor muscles, when preoccupied by cerebral influence, appear refractory.

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Words near extensor in the Dictionary