GLOSSARY 393 



Ul'na (Lat., the elbow) : the inner of the two bones of the fore arm. 



U're-a (Gr. ouron, urine, originally water) : a crystalline solid, soluble 

 in water. It is the final product of proteid decomposition in the 

 body, and the chief solid constituent of the urine. 



U-re'ter (Gr. oureter, from ouron, urine) : the excretory duct of the 

 kidney, conveying the renal excretion to the bladder. 



U-ri-nif'er-ous tu'bules : small tubes which collect the urine secreted 

 in the cortex of the kidneys. 



U'tri-cle (Lat. utriculus): a little sac; especially the little sac forming- 

 part of the membranous labyrinth of the ear. 



Vac-ci-na r tion (Lat. vacca, cow): inoculation with cowpox virus ob- 

 tained directly or indirectly from the cow. 



Va'gus (Lat., wandering) : the tenth pair of cranial nerves. 



Val'vu-lae con-ni-ven'tes (Lat. valva, the leaf of a double door; con- 

 nivere, to wink at, connive) : the semicircular folds in the lining 

 membrane of the small intestine, increasing the absorbing surface. 



Vas'cu-lar (Lat. vasculum, diminutive of vas, vessel) : containing 

 small vessels or tubes, as the vascular system for the circulation of 

 the blood. 



Vas-o-con-strict'or (Lat. vas, vessel, and Eng. constrictor, from Lat. 

 constringere, to draw together) : causing contraction of the blood 

 vessels. 



Vas-0-di-lat'or : causing dilation or relaxation of the blood vessels. 



Vas-o-mo'tor : regulating the tension of the muscular walls of the 

 blood vessels. 



Vein (Lat. vena) : one of the tubes carrying blood to the heart. 



Ve'na ca'va (Lat., hollow vein) : one of the great veins connected 

 directly with the heart. 



Ven-ti-la'tion (Lat. ventilare, to air, ventilate) : the process of repla- 

 cing foul or vitiated air in any confined space with pure air. 



Ven'tral (Lat. venter, belly) : toward the belly ; opposed to dorsal. 



Ven'tri-cle (Lat. ventriculus, diminutive of venter, belly) : a cavity, as 

 the ventricles of the heart or the brain. 



Ver'te-bra (Lat., a bone of the spine) : any segment of the backbone. 



Ver'te-brates : animals having a backbone. 



Ves'ti-bule (Lat. vestibulum, vestibule) : the central part of the laby- 

 rinth of the ear. 



Vil'lus (Lat., shaggy hair) : one of the minute projections covering 

 the valvulae conniventes. 



