rigidity


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Related to rigidity: rigidity modulus, abdominal rigidity, Muscle rigidity

rigidity

 [rĭ-jid´ĭ-te]
inflexibility or stiffness.
clasp-knife rigidity increased tension in the extensor of a joint when it is passively flexed, giving way suddenly on exertion of further pressure; seen especially in upper motor neuron disease. Called also clasp-knife reflex.
cogwheel rigidity tension in a muscle that gives way in little jerks when the muscle is passively stretched; seen in parkinson's disease.
decerebrate rigidity see decerebrate rigidity.
decorticate rigidity see decorticate rigidity.
paratonic rigidity an intermittent abnormal increase in resistance to passive movement in a comatose patient.

ri·gid·i·ty

(ri-jid'i-tē),
1. Stiffness or inflexibility.
See also: nuchal rigidity. Synonym(s): rigor (1)
2. In psychiatry and clinical psychology, an aspect of personality characterized by a person's resistance to change.
See also: nuchal rigidity.
3. In neurology, one type of increase in muscle tone at rest; characterized by increased resistance to passive stretch, independent of velocity and symmetric about joints; increases with activation of corresponding muscles in the contralateral limb. Two basic types are cogwheel rigidity and lead-pipe rigidity.
See also: nuchal rigidity.
[L. rigidus, rigid, inflexible]

rigidity

/ri·gid·i·ty/ (rĭ-jid´ĭ-te) inflexibility or stiffness.
clasp-knife rigidity  increased tension in the extensors of a joint when it is passively flexed, giving way suddenly on exertion of further pressure.
cogwheel rigidity  tension in a muscle which gives way in little jerks when the muscle is passively stretched.
decerebrate rigidity  rigid extension of an animal's legs as a result of decerebration; occurring in humans as a result of lesions in the upper brainstem.

rigidity

[rijid′itē]
Etymology: L, rigere, to be stiff
a condition of hardness, stiffness, or inflexibility. rigid, adj.

rigidity

Forensic pathology Rigor. See Rigor mortis Neurology Excessive muscle tone. See Extrapyramidal syndrome, Lead pipe rigidity, Parkinsonism Psychiatry An unreasonable resistance to change Vox populi Stiffness.

ri·gid·i·ty

(ri-jid'i-tē)
1. Stiffness or inflexibility.
Synonym(s): rigor (1) .
2. psychiatry, clinical psychology An aspect of personality characterized by a person's resistance to change.
3. neurology One type of increase in muscle tone at rest; characterized by increased resistance to passive stretch, independent of velocity and symmetric about joints; increases with activation of corresponding muscles in the contralateral limb. Two basic types are cogwheel rigidity and leadpipe rigidity.
See also: nuchal rigidity
[L. rigidus, rigid, inflexible]

rigidity

Sustained muscle tension causing the affected part of the body to become stiff and inflexible. Rigidity may be due to muscle injury, neurological disease such as PARKINSON'S DISEASE, underlying inflammation as in PERITONITIS, or arthritis in an adjacent joint. See also SPASTICITY.

rigidity

resistance to imposed movement, characteristic of Parkinson's disease
  • cogwheel rigidity alternating compliance with and resistance to imposed (passive) movement of arms/legs

  • lead pipe rigidity initial resistance to imposed (passive) arm/leg movement with later movement compliance; after the clinician has overcome initial resistance to movement, the patient's limb can be moved passively, slowly and smoothly

ri·gid·i·ty

(ri-jid'i-tē)
Stiffness or inflexibility.
[L. rigidus, rigid, inflexible]

rigidity,

n the characteristic of being nonflexible, which is essential in a connector, a reciprocal arm, or an indirect retaining unit of a removable partial denture.

rigidity

inflexibility or stiffness.

clasp-knife rigidity
increased tension in the extensor of a joint when it is passively flexed, giving way suddenly on exertion of further pressure; seen especially in upper motor neuron disease.
cogwheel rigidity
tension in a muscle that gives way in little jerks when the muscle is passively stretched.
lead-pipe rigidity
posture adopted when the rigidity of the limb is maintained equally throughout the passive flexion.
rigidity reflex
the state of immobility generated in female animals, especially those in estrus, when they make physical contact with a male.
References in classic literature ?
This devotion deeply moved her - and the adamantine face lost the stern rigidity of its terror.
Her rigidity was frightful, like the rigor of a corpse galvanized into harsh speech and glittering stare by the force of murderous hate.
The BTBR mouse exhibits several stereotypical behavioral characteristics that resemble behaviors seen in autism spectrum disorders, including repetitive behaviors, altered social interactions, cognitive rigidity and impaired adaption to environment.
A rigidity reducing portion that reduces a tire rigidity in the width direction extends in the circumferential direction on a surface of a tread rubber in an area located on the inner side than an end of a belt in the tire width direction and on the outer side than a road-contacting end in the tire width direction under a 75% load state.
The one-piece cast iron machine bed increases rigidity, and pre-tensioned ballscrews and LM guides increase accuracy, the company says.
However, the rigidity issue is not just a simple matter.
After the ten days of taking saffron there was a statistically significant improvement in tip rigidity and tip tumescence as well as base rigidity and base tumescence.
The empirical findings highlight a new selection effect that has important implications for the welfare consequences of measured price rigidity.
The monograph proves rigidity for the depth zero rafts and vertex rigidity within the rafts, explores the coarse lattice of vertex and edge spaces, and concludes that quasi-isometries on the Bass-Serre complex descend to quasi-isometries on the Bass-Serre tree.
Former Wood Ditton Stakes winner Secret World doesn't look like he stays, so the bets are the Tim Vaughan pair RULER OF ALL (2pts win at 20-1 with Bet 365) and RIGIDITY (3pts win at 7-1 with Paddy Power).
Sporting the first-choice colours of Simon Munir, who was also represented by the unplaced Tonic Mellysse, Raya Star weaved through the 16-runner field and battled on well to edge out Rigidity by half a length.
The company says that converters can now "manufacture attractive stand-up pouches that provide an effortless, precise straight-line tear across the package every time, as well as offer improved rigidity and clarity.