| SI | International System of Units [Fr. le Systeme International d'Unites]; sacroiliac; saline infusion; ... |
|---|---|
| SIG | small inducible gene |
| SISS | Sentinel Injury Surveillance System [for Gunshot and Stab Wounds] small inducible secreted substance... |
| SL | sarcolemma; sclerosing leukoencephalopathy; secondary leukemia; segment length; sensation level; sen... |
| SLL | small lymphocytic lymphoma |
| middle cervical cardiac nerve | <anatomy, nerve> One of the cardiopulmonary splanchnic nerves conveying postsynaptic sympathetic fibres running downward, from the middle cervical ganglion along the subclavian artery (on the left) or the brachiocephalic (on the right side) to join the cardiac plexus. Synonym: nervus cardiacus cervicalis medius. (05 Mar 2000) |
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| smallest cardiac veins | Numerous small valveless venous channels that open directly into the chambers of the heart from the capillary bed in the cardiac wall, enabling a form of collateral circulation unique to the heart. Synonym: smallest cardiac veins, thebesian veins. (05 Mar 2000) |
| superficial cardiac plexus | The superficial and smaller subdivision of the cardiac plexus, formed by the left superior cardiac nerves from the left vagus and cervical sympathetic trunk; it is found beneath the aortic arch, between the arch and the bifurcation of the pulmonary trunk. Synonym: plexus cardiacus superficialis. (05 Mar 2000) |
| superior cervical cardiac branches of vagus nerve | <anatomy, nerve> Uppermost of the branches of vagus nerve conducting presynaptic parasympathetic fibres to, and reflex afferent fibres from, the cardiac plexus; branching from the vagi close to the base of the skull. Synonym: rami cardiaci cervicales superiores nervi vagi. (05 Mar 2000) |
| superior cervical cardiac nerve | <anatomy, nerve> The uppermost of the cardiopulmonary splanchnic nerves which arises from the lower part of the superior cervical ganglion and passes down to form, with branches of the vagus, the cardiac plexus. Synonym: nervus cardiacus cervicalis superior. (05 Mar 2000) |
| death, sudden, cardiac | The sudden cessation of cardiac contraction, leading to death of the heart and, ultimately, of the individual, resulting from ventricular tachycardia-fibrillation or asystole. (12 Dec 1998) |
| deep cardiac plexus | The deeper part of the cardiac plexus. Synonym: plexus cardiacus profundus. (05 Mar 2000) |
| inferior cervical cardiac branches of vagus nerve | <anatomy, nerve> The most inferior of the cervical branches of vagus nerve conducting presynaptic parasympathetic fibres to, and reflex afferent fibres from, the cardiac plexus; branching from the vagi at root of neck. Synonym: rami cardiaci cervicales inferiores nervi vagi. (05 Mar 2000) |
| inferior cervical cardiac nerve | <anatomy, nerve> A nerve passing from the stellate ganglion to the cardiac plexus. Synonym: nervus cardiacus cervicalis inferior. (05 Mar 2000) |
| innominate cardiac veins | The small superficial vein's of the heart. Synonym: Vieussens' veins. (05 Mar 2000) |
| isometric period of cardiac cycle | That period in which the muscle fibres do not shorten although the cardiac muscle is excited and the pressure in the ventricles rises, extending from the closure of the atrioventricular valves to the opening of the semilunar valves (isovolumic constriction) or the reverse (isovolumic relaxation). (05 Mar 2000) |
| thoracic cardiac branches of vagus nerve | <anatomy, nerve> Branches of vagus nerve to the cardiac plexus which branch from the vagi at thoracic levels, conducting presynpatic parasympathetic fibres to, and reflex afferent fibres from, the cardiac plexus. Synonym: rami cardiaci thoracici nervi vagi. (05 Mar 2000) |
| thoracic cardiac nerves | Part of the cardiopulmonary splanchnic nerves from the second to fifth segments of the thoracic sympathetic trunk that pass medially and anteriorly to enter the cardiac plexus; they convey postsynaptic sympathetic fibres to, and visceral afferent (pain) fibres from, the heart. Synonym: nervi cardiaci thoracici, upper thoracic splanchnic nerves. (05 Mar 2000) |
| edema, cardiac | A manifestation of congestive heart failure caused by increased venous and capillary pressures and often associated with the retention of sodium by the kidneys. (12 Dec 1998) |
| electric cardiac pacemaker | An electric device that can substitute for the normal cardiac pacemaker, controlling the heart's rhythm by artificial electric discharges. Synonym: electronic pacemaker. (05 Mar 2000) |