| irritability | 1. The state or quality of being irritable; quick excitability; petulance; fretfulness; as, irritability of temper. 2. <physiology> A natural susceptibility, characteristic of all living organisms, tissues, and cells, to the influence of certain stimuli, response being manifested in a variety of ways, as that quality in plants by which they exhibit motion under suitable stimulation; especially, the property which living muscle processes, of responding either to a direct stimulus of its substance, or to the stimulating influence of its nerve fibres, the response being indicated by a change of form, or contraction; contractility. 3. <medicine> A condition of morbid excitability of an organ or part of the body; undue susceptibility to the influence of stimuli. See Irritation. Origin: L. Irritabilitas: cf. F. Irritabilite. Source: Websters Dictionary (01 Mar 1998) |
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| myotatic | Relating to myotasis. (05 Mar 2000) |
| myotatic contraction | A reflex contraction of a skeletal muscle that occurs as a result of stimulation of the stretch receptors in the muscle, i.e., as part of a myotatic reflex. (05 Mar 2000) |
| myotatic reflex | Tonic contraction of the muscles in response to a stretching force, due to stimulation of muscle proprioceptors. Synonym: Liddell-Sherrington reflex, muscular reflex, stretch reflex. (05 Mar 2000) |
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