| C2 | second cervical nerve; second cervical vertebra; second component of complement |
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| CII | second cranial nerve |
| C3 | third cervical nerve; third cervical vertebra; third component of complement |
| CIII | third cranial nerve |
| C4 | fourth cervical nerve; fourth cervical vertebra; fourth component of complement |
| choroid plexus of fourth ventricle | One of two vascular fringes of pia mater projecting on either side from the lower part of the roof of the fourth cerebral ventricle. Synonym: plexus choroideus ventriculi quarti. (05 Mar 2000) |
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| choroid plexus of lateral ventricle | The vascular fringe that projects from the choroidal fissure into each lateral ventricle. Synonym: plexus choroideus ventriculi lateralis. (05 Mar 2000) |
| choroid plexus of third ventricle | The double row of vascular projections from the undersurface of the tela choroidea where it roofs over the third ventricle. Synonym: plexus choroideus ventriculi tertii. (05 Mar 2000) |
| choroid plexus papilloma | <radiology> Isodense or hyperdense enhancing mass, location: usually atrium of lateral ventricle, age: usually less than 10 yrs, complications: non-obstructive hydrocephalus (12 Dec 1998) |
| pharyngeal plexus | The plexus of nerves including branches of the glossopharyngeal, vagus, and accessory nerves (cranial root), that lies along the posterior wall of the pharynx, a venous plexus on the posteriolateral walls of the pharynx, emptying through the pharyngeal veins into the internal jugular. Synonym: plexus pharyngeus. (05 Mar 2000) |
| ciliary ganglionic plexus | An autonomic plexus lying on the ciliary muscle, derived from the oculomotor, trigeminal, and sympathetic. Synonym: plexus gangliosus ciliaris. (05 Mar 2000) |
| middle sacral plexus | A lymphatic plexus formed of lymph nodes and connecting vessels situated chiefly in the mesorectum anterior and inferior to the sacral promontory. Synonym: plexus sacralis medius. (05 Mar 2000) |
| middle trunk of brachial plexus | The continuation of the ventral ramus of the seventh cervical nerve; it contributes fibres to the posterior and lateral cords (fasciculi) of the brachial plexus. Synonym: truncus medius plexus brachialis. (05 Mar 2000) |
| phrenic plexus | Plexus phrenicus, an autonomic plexus surrounding the inferior phrenic artery. (05 Mar 2000) |
| Walther's plexus | <anatomy> The portion of the internal carotid plexus in the cavernous sinus. Synonym: plexus cavernosus, Walther's plexus. (05 Mar 2000) |
| coccygeal plexus | A small plexus formed by the fifth sacral and the coccygeal nerves; it gives origin to the anococcygeal nerves. Synonym: plexus coccygeus. (05 Mar 2000) |
| coeliac (lymphatic) plexus | A network formed of the efferent and afferent lymphatic vessels of the coeliac lymph nodes and related to the coeliac trunk; the afferent lymphatic vessels bring lymph primarily from structures served by the coeliac artery (stomach, duodenum, pancreas, and visceral aspect of the liver); the efferent vessels drain into the cisterna chyli/thoracic duct via the intestinal lymph trunks. (05 Mar 2000) |
| coeliac (nervous) plexus | The most substantial, superior portion of the abdominal aortic plexus lying anterior to the aorta at the level of origin of the coeliac trunk (vertebral level T-12); the coeliac ganglia lie within the plexus; it is formed by contributions from the greater splanchnic and vagus (especially the posterior or right vagus) nerves and communicating branches to and from the superior mesenteric and renal plexuses and ganglia; most sympathetic, parasympathetic and visceral afferent fibres serving the abdominal viscera pass through this plexus. Synonym: plexus coeliacus, solar plexus. (05 Mar 2000) |
| coeliac plexus | A complex network of nerve fibres including sympathetic and parasympathetic efferents and visceral afferents. The coeliac plexus is the largest of the autonomic plexuses and is located in the abdomen surrounding the coeliac and superior mesenteric arteries. (12 Dec 1998) |
| coeliac plexus reflex | Arterial hypotension coincident with surgical manipulations in the upper abdomen during general anaesthesia. (05 Mar 2000) |