Valvulae Conniventes. A name given to transverse folds of the mucous membrane in the small intestine. Varicose (Lat. _varix_, a dilated vein). A distended or enlarged vein. Vascular (Lat. _vasculum_, a little vessel). Pertaining to or possessing blood or lymph vessels. Vaso-motor (Lat. _vas_, a vessel, and _moveo, motum_, to move). Causing _motion_ to the _vessels_. Vaso-motor nerves cause contraction and relaxation of the blood-vessels. Venæ Cavæ, pl. of Vena Cava. “Hollow veins.” A name given to the two great veins of the body which meet at the right auricle of the heart Venous (Lat. _vena_, a vein). Pertaining to, or contained within, a vein. Ventilation. The introduction of fresh air into a room or building in such a manner as to keep the air within it in a pure condition. Ventral (Lat. _venter, ventris_, the belly). Belonging to the abdominal or belly cavity. Ventricles of the Heart. The two largest cavities of the heart. Vermiform (Lat. _vermis_, a worm, and _forma_, form). Worm-shaped. Vertebral Column (Lat. _vertebra_, a joint). The backbone; also called the spinal column and spine. Vestibule. A portion of the internal ear, communicating with the semicircular canals and the cochlea, so called from its fancied resemblance to the vestibule, or porch, of a house. Villi (Lat. _villus_, shaggy hair). Minute, thread-like projections upon the internal surface of the small intestine, giving it a velvety appearance. Virus (Lat., poison). Foul matter of an ulcer; poison. Vital Knot. A part of the medulla oblongata, the destruction of which causes instant death. Vitreous (Lat. _vitrum_, glass). Having the appearance of glass; applied to the humor occupying the largest part of the cavity of the eyeball. Vivisection (Lat. _vivus_, alive, and _seco_, to cut). The practice of operating upon living animals, for the purpose of studying some physiological process. Vocal Cords. Two elastic bands or ridges situated in the larynx; the essential parts of the organ of voice. Zygoma (Gr. ζυγώς, a yoke). The arch formed by the malar bone and the zygomatic process of the temporal bone. Index.