| innominate veins | An obsolete term for brachiocephalic veins. (05 Mar 2000) |
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| insular veins | Veins draining the cortex of the insula, tributaries to the deep middle cerebral vein. Synonym: insular veins. (05 Mar 2000) |
| intercapitular veins | The veins connecting the dorsal and palmar veins in the hand, or the dorsal and plantar veins in the foot. Synonym: venae intercapitales. (05 Mar 2000) |
| intercostal veins | See: anterior intercostal veins, posterior intercostal veins, highest intercostal vein, left superior intercostal vein. (05 Mar 2000) |
| interlobar veins of kidney | The veins in the kidney that parallel the interlobar arteries, receiving blood from arcuate veins, and terminate in the renal vein. Synonym: venae interlobares renis. (05 Mar 2000) |
| interlobular veins of kidney | They parallel the interlobular arteries and drain the peritubular capillary plexus, emptying into the arcuate veins. Synonym: venae interlobulares renis. (05 Mar 2000) |
| interlobular veins of liver | The terminal branches of the portal vein that course in the portal canals between the conceptual liver lobules and empty into the liver sinusoids. Synonym: venae interlobulares hepatis. (05 Mar 2000) |
| internal auditory veins | One or more veins accompanying the labyrinthine artery; they drain the internal ear, pass out through the internal acoustic meatus, and empty into the transverse sinus or the inferior petrosal sinus. Synonym: venae labyrinthi, internal auditory veins. (05 Mar 2000) |
| internal cerebral veins | Paired veins passing caudally near the midline in the tela choroidea of the third ventricle, formed by the union of the choroid vein, thalamostriate (terminal) vein, and vein of septum pellucidum, and uniting caudally so as to form the great cerebral vein. Synonym: venae cerebri internae, veins of Galen. (05 Mar 2000) |
| intersegmental veins | A vein receiving blood from adjacent bronchopulmonary segments; it emerges from the inferior margin of a segment to become a tributary of a branch of a pulmonary vein. Synonym: infrasegmental part, intersegmental part of pulmonary vein, pars infrasegmentalis. (05 Mar 2000) |
| intrasegmental veins | A vein emerging from the bronchopulmonary segment it drains; a tributary to a branch of a pulmonary vein. Synonym: pars intrasegmentalis, intrasegmental part. (05 Mar 2000) |
| occipital cerebral veins | The superior cerebral veins draining the occipital cortex and emptying into the superior sagittal sinus and the transverse sinus. Synonym: venae occipitales. (05 Mar 2000) |
| oesophageal veins | Series of veins draining the submucous venous plexus of the oesophagus; proceding inferiorly from the cervical portion of the oesophagus, they drain to the inferior thyroid vein, the superior intercostal veins, the azygos, accessory hemiazygos and hemiazygos veins, all of which are ultimately tributaries of the superior vena cava; the most inferior oesophageal veins, from the cardiac portion of the oesophagus, drain via the oesophageal branches of the left gastric vein, a tributary of the portal vein. Thus, the submucosal veins of the inferior oesophagus form a portocaval anastomoses, and are subject to the formation of varicosities in portal hypertension. Synonym: venae oesophageae. (05 Mar 2000) |
| openings of pulmonary veins | The orifices of the pulmonary veins, usually two on each side, in the wall of the left atrium. Synonym: ostia venarum pulmonalium. (05 Mar 2000) |
| ophthalmic veins | See: inferior ophthalmic vein, superior ophthalmic vein. (05 Mar 2000) |