| 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) |
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| ophthalmic veins | See: inferior ophthalmic vein, superior ophthalmic vein. (05 Mar 2000) |
| ovarian veins | See: right ovarian vein, left ovarian vein. (05 Mar 2000) |
| temporal veins | See: middle temporal vein, deep temporal veins, superficial temporal veins. (05 Mar 2000) |
| testicular veins | See: right testicular vein, left testicular vein. (05 Mar 2000) |
| thalamostriate veins | See: inferior thalamostriate veins, superior thalamostriate vein. (05 Mar 2000) |
| thebesian veins | Synonym: venae cordis minimae. (05 Mar 2000) |
| thoracic veins | See: internal thoracic vein, lateral thoracic vein. (05 Mar 2000) |
| thymic veins | A number of small veins from the thymus emptying into the left brachiocephalic vein. Synonym: venae thymicae. (05 Mar 2000) |
| thyroid veins | See: inferior thyroid vein, middle thyroid vein, superior thyroid vein, plexus thyroideus impar. (05 Mar 2000) |
| tracheal veins | Several small venous trunks from the trachea, emptying into the brachiocephalic veins or the superior vena cava. Synonym: venae tracheales. (05 Mar 2000) |
| transverse cervical veins | Venae comitantes of the corresponding arteries, emptying into the external jugular vein or sometimes into the subclavian vein. Synonym: venae transversae colli, transverse veins of neck. (05 Mar 2000) |
| transverse veins of neck | Venae comitantes of the corresponding arteries, emptying into the external jugular vein or sometimes into the subclavian vein. Synonym: venae transversae colli, transverse veins of neck. (05 Mar 2000) |
| epigastric veins | See: inferior epigastric vein, superficial epigastric vein, superior epigastric veins. (05 Mar 2000) |
| episcleral veins | A series of small venules in the sclera close to the corneal margin that empty into the anterior ciliary veins. Synonym: venae episclerales. (05 Mar 2000) |