| SNR | selective nerve root [block]; signal-to-noise ratio; substantia nigra zona reticulata; supernumerary... |
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| SNRB | selective nerve root block |
| SSBG | sex steroid-binding globulin; social services block grant |
| TAVB | total atrioventricular block |
| plexus arteriae choroideae | <anatomy, artery> An autonomic plexus accompanying the artery of the same name, derived from the internal carotid plexus. Synonym: plexus arteriae choroideae. (05 Mar 2000) |
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| plexus auricularis posterior | An autonomic plexus on the artery of this name, derived from the external carotid plexus. Synonym: plexus auricularis posterior. (05 Mar 2000) |
| plexus autonomici | Plexus's of nerves in relation to blood vessels and viscera, the component fibres of which are sympathetic, parasympathetic, and sensory. Synonym: plexus autonomici. (05 Mar 2000) |
| plexus axillaris | A lymphatic plexus formed of the lymph nodes, with their afferent and efferent vessels, in the axilla. Synonym: plexus axillaris. (05 Mar 2000) |
| plexus basilaris | A venous plexus on the clivus, connected with the cavernous and petrosal sinuses and the internal vertebral (epidural) venous plexus. Synonym: plexus basilaris, basilar sinus. (05 Mar 2000) |
| plexus brachialis | A network of lower cervical and upper dorsal spinal nerves supplying the arm, forearm and hand. (27 Sep 1997) |
| plexus cardiacus | A wide-meshed network of anastomosing cardiopulmonary and splanchnic nerves arising from the afferent and autonomic nerve fibres (sympathetic) and vagus (parasympathetic) nerves, surrounding the arch of the aorta, the pulmonary artery, and continuing to the atria, ventricles, and coronary vessels. Synonym: plexus cardiacus. (05 Mar 2000) |
| plexus cardiacus profundus | The deeper part of the cardiac plexus. Synonym: plexus cardiacus profundus. (05 Mar 2000) |
| plexus cardiacus superficialis | 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) |
| plexus caroticus communis | An autonomic plexus accompanying the artery of the same name formed by fibres from the middle cervical ganglion. Synonym: plexus caroticus communis. (05 Mar 2000) |
| plexus caroticus externus | An autonomic plexus formed by the external carotid nerves surrounding the artery of the same name, and giving origin to a number of secondary plexus's along the branches of this artery and to branches to the carotid body. Synonym: plexus caroticus externus. (05 Mar 2000) |
| plexus caroticus internus | A venous network around the internal carotid artery in the carotid canal of the temporal bone, connecting with the cavernous sinus and internal jugular vein. Synonym: plexus venosus caroticus internus, internal carotid (nervous) plexus, plexus caroticus internus. (05 Mar 2000) |
| plexus cavernosi concharum | Erectile tissue in the mucous membrane covering the conchae of the nasal cavity. Synonym: plexus cavernosi concharum, corpus cavernosum conchae. (05 Mar 2000) |
| plexus cavernosus | <anatomy> The portion of the internal carotid plexus in the cavernous sinus. Synonym: plexus cavernosus, Walther's plexus. (05 Mar 2000) |
| plexus cervicalis | A network of nerve fibres originating in the upper four cervical spinal cord segments. The cervical plexus distributes cutaneous nerves to parts of the neck, shoulders, and back of the head, and motor fibres to muscles of the cervical spinal column, infrahyoid muscles, and the diaphragm. (12 Dec 1998) |