| C3 | third cervical nerve; third cervical vertebra; third component of complement |
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| C4 | fourth cervical nerve; fourth cervical vertebra; fourth component of complement |
| C5 | fifth cervical nerve; fifth cervical vertebra; fifth component of complement |
| C6 | sixth cervical nerve; sixth cervical vertebra; sixth component of complement |
| C7 | seventh cervical nerve; seventh cervical vertebra; seventh component of complement |
| sympathetic amine | An agent that evokes responses similar to those produced by adrenergic nerve activity (e.g., epinephrine, ephedrine, isoproterenol). Synonym: adrenergic amine, adrenomimetic amine, sympathetic amine. (05 Mar 2000) |
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| sympathetic blockade | Interruption of transmission in sympathetic ganglia or conduction of impulses in pre-or postganglionic sympathetic nerve fibres. (05 Mar 2000) |
| sympathetic denervation | <procedure, surgery> Removal of the sympathetic nervous systems influence in one area of the body. This may be accomplished with drugs or surgery. A treatment for reflex sympathetic dystrophy. (27 Sep 1997) |
| sympathetic fibres, postganglionic | Nerve fibres which project from sympathetic ganglia to synapses on target organs. Sympathetic postganglionic fibres use norepinephrine as transmitter, except for those innervating eccrine sweat glands (and possibly some blood vessels) which use acetylcholine. They may also release peptide cotransmitters. (12 Dec 1998) |
| sympathetic formative cell | A neuroblast of the embryonic autonomic nervous system. (05 Mar 2000) |
| sympathetic ganglia | Those ganglia of the autonomic nervous system that receive efferent fibres originating from preganglionic visceral motor neurons in the intermediolateral cell column of thoracic and upper lumbar spinal segments (T1-L2). On the basis of their location, the sympathetic ganglia can be classified as paravertebral ganglia (ganglia trunci sympathici) and prevertebral ganglia (ganglia coeliaca). See: autonomic nervous system. (05 Mar 2000) |
| sympathetic heterochromia | Heterochromia iridis occurring after lesions of the cervical sympathetic nerves. (05 Mar 2000) |
| sympathetic hormone | <protein> A neurohormone, such asepinephrine, produced in response to stimulationof the sympathetic nervous system and which acts as a chemical mediator invarious organs. (09 Oct 1997) |
| sympathetic hypertonia | Overfunction of the sympathetic nervous system, often experienced as anxiety. (05 Mar 2000) |
| sympathetic imbalance | Hyperexcitability of the vagus nerve, a condition in which the vagus nerve dominates in the general functioning of the body organs. It is marked by vasomotor instability, constipation, sweating and involuntary motor spasms with pain. (18 Nov 1997) |
| sympathetic iridoplegia | Iridoplegia due to the paralysis of the sympathetically innervated dilator pupillae muscle. (05 Mar 2000) |
| sympathetic iritis | Iritis consecutive to a similar condition in the other eye. (05 Mar 2000) |
| sympathetic nerve | <anatomy, nerve> One of the nerve's of the sympathetic nervous system. (05 Mar 2000) |
| sympathetic nervous system | <anatomy, physiology> One of the two divisions of the vertebrate autonomic nervous system (the other being the parasympathetic nervous system). The sympathetic preganglionic neurons have their cell bodies in the thoracic and lumbar regions of the spinal cord and connect to the paravertebral chain of sympathetic ganglia. Innervate heart and blood vessels, sweat glands, viscera and the adrenal medulla. most sympathetic neurons, but not all, use noradrenaline as a post ganglionic neurotransmitter. (19 Jan 1998) |
| sympathetic ophthalmia | A serous or plastic uveitis caused by a perforating wound of the uvea followed by a similar severe reaction in the other eye that may lead to bilateral blindness. Synonym: transferred ophthalmia. (05 Mar 2000) |