| tonus | <physiology> Tonicity, or tone; as, muscular tonus. Origin: L. A sound, tone. See Tone. Source: Websters Dictionary (01 Mar 1998) |
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| baseline tonus | Intrauterine pressure between contractions during labour. (05 Mar 2000) |
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| muscle tonus | The state of activity or tension of a muscle beyond that related to its physical properties, that is, its active resistance to stretch. In skeletal muscle, tonus is dependent upon efferent innervation. (12 Dec 1998) |
| myogenic tonus | Contraction of a muscle caused by intrinsic properties of the muscle or by its intrinsic innervation. (05 Mar 2000) |
| neurogenic tonus | Contraction of a muscle caused by the influence of its extrinsic nerve supply (05 Mar 2000) |