tonus


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Related to tonus: clonus, muscle tonus

tonus

 [to´nus]
tone or tonicity; the slight, continuous contraction of a muscle, which in skeletal muscles aids in the maintenance of posture and in the return of blood to the heart.

to·nic·i·ty

(tō-nis'i-tē),
1. A state of normal tension of the tissues by virtue of which the parts are kept in shape, alert, and ready to function in response to a suitable stimulus. In the case of muscle, it refers to a state of continuous activity or tension beyond that related to the physical properties; that is, it is active resistance to stretch; in skeletal muscle it is dependent upon the efferent innervation.
See also: isotonicity. Synonym(s): tonus
2. The osmotic pressure or tension of a solution, usually relative to that of blood.
See also: isotonicity.
[G. tonos, tone]

tonus

(tō′nəs)
n. pl. to·nuses
Body or muscular tone; tonicity.

to·nic·i·ty

(tō-nis'i-tē)
1. A state of normal tension of the tissues by virtue of which the parts are kept in shape, alert, and ready to function in response to a suitable stimulus. In the case of muscle, it refers to a state of continuous activity or tension beyond that related to the physical properties, i.e., its active resistance to stretch; in skeletal muscle, it is dependent on the efferent innervation.
Synonym(s): tonus.
2. The osmotic pressure or tension of a solution, usually relative to that of blood.
See also: isotonicity
[G. tonos, tone]

tonus

the state of moderate contraction of muscle as a result of continuous low-level stimulation which maintains the posture of an animal.Tonus occurs because some cells in every muscle are in TETANUS (1) and the muscle feels firm. The condition continues without fatigue because some cells are relaxed whilst others are contracted.

tonus 

A state of partial contraction present in a muscle in its passive state as, for example, when the eye is in the physiological position of rest. Syn. muscle tone. See resting state of accommodation; physiological position of rest; tonic vergence.
References in periodicals archive ?
In epileptic patients with drug refractory seizures who underwent intracarotid amobarbital injections (wada test), it was noticed sympathetic tonus predominance in the right hemisphere and parasympathetic predominance and up-regulation of baroreceptor sensitivity in the left hemisphere [28].
Paroxysmal consciousness disorders with vascular, cardiac or neurologic origin characterized by sudden loss of consciousness, loss of tonus, falling, and spontaneous recovery in a short time are called syncope.
Bunun yaninda akinetik mutizm, yabanci el (alien hand), yakalama refleksi, inkontinans, tonus artisi, transkortikal afazi diger nadir semptomlardir (2).
Segundo estes autores e TILLEY (1992), este fato deve-se a alta atividade do componente autonomo simpatico em gatos, quando comparado aos caes com predominio do tonus parassimpatico.
Tonus Therapeutics will be eligible to receive potential milestones and royalties on future sales of any resulting DMD products.
A classificacao do tonus uterino baseou-se na palpacao do tecido uterino e com a complementacao visual da imagem ecografica do lumen, conforme Rodrigues et al.
A group of the victims of a housing fraud by Tonus Construction LLC and Artsakh Bank are planning a protest
Electromyographic (EMG) recordings from the dorsal neck muscles of the mice allowed verification of muscular tonus and aided in the classification of various times within the SWC.
Foi avaliada a influencia do tonus uterino no momento da TE sobre as taxas de gestacao nas receptoras de embriao.
Les membres du groupe et le public se sont regales grace au tonus et a la qualite des musiciens et chanteurs de cet ensemble latin.
Nesse estudo, e importante observar que a dimensao agressividade foi heterogenea quanto aos tracados que a compoem, pois incluiu tracados relacionados aos fatores teoricos advindos da reacao vivencial, agressividade e tonus vital.