GLOSSARY 457 



Trophic. (From the Greek word meaning nourishment.) Pertaining 

 to nutrition. Trophic centre, a collection of ganglion cells regulating 

 the nutrition of a nerve, and thus through the latter the part it 

 supplies. 



Tuber Cinereum. A tract of gray matter at the base of the cere- 

 brum, extending from the optic chiasm to the corpora mammillaria, and 

 forming part of the floor of the third ventricle. 



Tuberculum or Tubercle. (From the Latin word tuberculum, "a 

 tubercle.") A small nodule.' A rounded prominence on a bone. 



Tuberosity. (From the Latin word tuber, "a swelling.") A pro- 

 tuberance on a bone. 



Tubular. From the Latin word tubulus, a dim. of tubus, "a tube.") 

 Shaped like a tube. Pertaining to a tube. 



Tubule. From the Latin word tubulus, "a small tube." 



Tunica. (From the Latin word tunica, " tunic.") A coat or mem- 

 brane. 



Tunica Adyentitia. The outer coat of an artery or vein. 



Tunica Intima. The inner coat of an artery or vein. 



Tunica Media. The middle coat of an artery or vein. 



Tympanic (membrane). Pertaining to the tympanum. 



Tympanum. (From the Greek word meaning "a drum.") The 

 middle ear. 



Ulna (bone). (From the Latin word ulna, "a cubit.") The bone 

 on the inner side of the forearm. 



Unciform (bone). (From the Latin word uncus, "a hook;" forma, 

 "form.") Hook-shaped. A hook-shaped bone in the second row of 

 the wrist. 



Unipolar. (From the Latin words imus, "one;" polus, "a pole.") 

 Having but one pole or process. As a unipolar nerve cell. 



Urea. The chief nitrogenous constituent of the urine, and principal 

 end-product of tissue metabolism. 



Uriniferous (tubules). (From the Latin words urina, "urine;" ferre, 

 "to bea;\") The tubules which carry or convey urine from the kidney 

 substance to the pyramids of the kidney. 



Uvula. (From the Latin word uvula, from the dim. of uva, "a 

 grape.") The cone-shaped appendage hanging from the free edge of 

 the soft palate. 



Vagina. (From the Latin word vagina, "a sheath.") 1. A sheath. 

 2. The musculomernbranous canal extending from the vulval opening 

 to the mouth of the cervix of the uterus (ostium externum), ensheathing 

 the latter and the penis (male) during coitus. (See Coitus.) 



Vaginal. 1. Pertaining to or of the nature of a sheath. 2. Relating 

 to the vagina. 



Valvulae Conniventes. The small transverse folds of mucous mem- 

 brane of the small intestine. 



Vasa Brevia. The short vessels. The small branches of the splenic 

 artery which pass to the fundus of the stomach. 



Vasoconstrictor (nerves). (From the Latin words vas, "vessel;" 

 constringere, "to constrict.") Nerves which when stimulated cause 

 a contraction of the bloodvessels. 



Vasodilator. (From the Latin words vas, "a vessel;" dilator, "a 

 dilator.") Nerves which when stimulated cause a dilatation of the 

 bloodvessels. 



