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- noun vastus intermedius
Sorry, no etymologies found.
The single-joint extensor (vasto-crureus) of each knee is isolated; and nothing but that muscle pair thus retained is still innervated in the whole of the two limbs.
This passive flexion excites in the extensor muscle which it stretches a reflex relaxation, i.e. the lengthening reaction; this relaxation at one knee is accompanied in the opposite fellow vasto-crureus by a reflex contraction enhancing the existing "tonic" contraction.