| carotid wall of middle ear | It contains the carotid canal and the opening of the auditory tube. Synonym: paries caroticus cavi tympani, anterior wall of middle ear, carotid wall of middle ear. (05 Mar 2000) |
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| carotid-cavernous fistula | A fistulous communication, of spontaneous or traumatic origin, between the cavernous sinus and the traversing internal carotid artery; a pulsating unilateral exophthalmos and a detectable cranial bruit are common manifestations. (05 Mar 2000) |
| carotid-cavernous sinus fistula | <radiology> Aetiology: laceration of ICA within cavernous sinus; usually secondary to basal skull fractures or penetrating trauma, rupture of an intracavernous ICA aneurysm symptoms: chemosis, conjunctival oedema, bruit findings: focal or diffuse enlargement of cavernous sinus, edematous extraocular muscles, arterial enlargement (pulsating exophthalamus), dilation of superior ophthalmic, facial, and internal jugular veins, occasional sellar erosion/enlargement, enlargement of superior orbital fissure (chronic phase) (12 Dec 1998) |
| carotid-vertebral artery anastomoses | <radiology> Trigeminal a. (most common variant: 0.1-0.2%), otic a., hypoglossal a., proatlantal intersegmental a., ** posterior communicating a. (PCA), -- normal anastomosis of carotid to BASILAR artery) (12 Dec 1998) |
| carotidynia | Pain caused by pressure on the carotid artery. Synonym: carotidynia. Origin: G. Odyne, pain (05 Mar 2000) |
| carotin | <biochemistry> Hydrocarbon carotenoids usually with 9 conjugated double bonds. _ carotene is the precursor of Vitamin A, each molecule giving rise to two Vitamin A molecules. (18 Nov 1997) |
| carotinaemia | Tempoary yellowing of the skin due to excessive carotene in the diet, commonly seen in infants fed too much mushed carrots or adults consuming high quantities of carrots or beta-carotene. (12 Dec 1998) |
| carotinase | <enzyme> An enzyme catalyzing the reaction of beta-carotene plus O2 producing two retinals. Synonym: beta-carotene cleavage enzyme, carotenase, carotinase. (05 Mar 2000) |
| carotinoid | <biochemistry> Accessory lipophilic photosynthetic pigments in plants and bacteria, including carotenes and xanthophylls, red, orange or yellow, with broad absorption peaks at 450-480nm. Act as secondary light harvesting pigments, passing energy to chlorophyll and as protective agents, preventing photoxidation of chlorophyll. Found in chloroplasts and also in plastids in some nonphotosynthetic tissues, for example carrot root. (18 Nov 1997) |
| carotinosis cutis | A harmless reversible yellow colouration of the skin caused by an increase in carotene content. Synonym: carotenoderma, carotinosis cutis. (05 Mar 2000) |
| carotodynia | Pain caused by pressure on the carotid artery. Synonym: carotidynia. Origin: G. Odyne, pain (05 Mar 2000) |