clonus

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Related to foot clonus: ankle clonus

clonus

 [klo´nus]
1. alternate involuntary muscular contraction and relaxation in rapid succession.
2. a continuous rhythmic reflex tremor initiated by the spinal cord below an area of spinal cord injury, set in motion by reflex testing.
ankle clonus (foot clonus) a series of abnormal reflex movements of the foot, induced by sudden dorsiflexion, causing alternate contraction and relaxation of the triceps surae muscle.
toe clonus abnormal rhythmic contraction of the great toe, induced by sudden passive extension of its first phalanx.
wrist clonus spasmodic contraction of the hand muscles, induced by forcibly extending the hand at the wrist.

clo·nus

(klō'nŭs),
A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession seen with, among other conditions, spasticity and some seizure disorders.
See also: contraction.
[G. klonos, a tumult]

clonus

/clo·nus/ (klo´nus)
1. alternate involuntary muscular contraction and relaxation in rapid succession.
2. a continuous rhythmic reflex tremor initiated by the spinal cord below an area of spinal cord injury, set in motion by reflex testing.clon´ic

ankle clonus , foot clonus a series of abnormal reflex movements of the foot, induced by sudden dorsiflexion, causing alternate contraction and relaxation of the triceps surae muscle.
wrist clonus  spasmodic movement of the hand, induced by forcibly extending the hand at the wrist.

clonus

(klō′nəs)
n. pl. clo·nuses
An abnormality in neuromuscular activity characterized by rapidly alternating muscular contraction and relaxation.

clon′ic (klŏn′ĭk, klō′nĭk) adj.
clo·nic′i·ty (klō-nĭs′ĭ-tē, klŏ-), clo′nism (klō′nĭz′əm, klŏn′ĭz′əm) n.

clonus (C)

[klō′nəs]
Etymology: Gk, klonos, tumult
an abnormal pattern of neuromuscular activity, characterized by rapidly alternating involuntary contraction and relaxation of skeletal muscle. Compare tonus. clonic, adj.

clonus

Neurology
1. A volley of muscle contractions and relaxations, occurring in rapid succession.
2. An abrupt transient muscle contraction.

clo·nus

(klō'nŭs)
A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession; seen with, among other conditions, spasticity, and some seizure disorders.
See also: contraction
Synonym(s): clonospasm.
[G. klonos, a tumult]

clonus

Repetitive contraction and relaxation of stretched muscles which have been deprived of the smoothing and controlling influence of higher centres in the nervous system, in conditions such as STROKE. A feature of an ‘upper motor neurone lesion’. Clonus is also a feature of GRAND MAL epilepsy.

clonus

involuntary movement diagnostic of an upper motor neurone lesion, marked by rapidly alternating muscle group contraction and relaxation and induced by sudden tendon stretch (e.g. sudden dorsiflexion of foot at the ankle causes clonus foot tremor)

clonus (klōˑ·ns),

n abnormal neuromuscular activity marked by the involuntary relaxation and contractions of the skeletal muscles.

clo·nus

(klō'nŭs)
A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession seen with, among other conditions, spasticity and some seizure disorders.
[G. klonos, a tumult]

clonus (klō´nəs),

n an alternating muscular spasm and relaxation in rapid succession.

clonus

alternate involuntary muscular contraction and relaxation in rapid succession. A sign of upper motor neuron disease.