Glossary. 309 



Thyroid .(thl'-roi<T). Shield-shaped, as the thyroid cartilage oi the 

 larynx. 



Tibia (tib'-i-a). The larger (inner) of the two bones of the leg, com- 

 monly called the shinbone. 



Trachea (tra-ke'-a or tra'-ke-a}. The windpipe. 



Triceps (tri'-seps). Triceps of the arm, the extensor of the arm, lying 

 along the back of the humerus. 



Tricuspid (tri-kus'-pid) . Having three cusps or points, as thetricuspid 

 valve. 



Trypsin (trip'-sin}. The proteolytic ferment of pancreatic juice. 



Ulna (wZ'-na). The larger (inner) of the two bones of the forearm. 



Ureter (u-re'-ter'}. The tube conveying the urine from the pelvis of the 

 kidney to the bladder. 



Vaso-constrictor (vas'-o-kon-strik'-tor}. Causing a constriction of the 

 blood-vessels. 



Vaso-dilator (vas'-o-di-la'-tor}. Pertaining to the positive dilating mo- 

 tility of the non-striated muscles of the vascular system. 



Vaso-motor (vas-d-mo'-tor). Serving to regulate the tension of the 

 blood-vessels, as vaso-motor nerves ; including vaso-dilator and 

 vaso-constrictor mechanisms. 



Ventricle (veri-tri-kl}. Applied to certain structures having a bellied 

 appearance. The cavities of the heart from which the blood is 

 forced out through the arteries. 



Vesicle (ves'-i-kl*). A small, membranous, bladder-like formation, as 

 air vesicle. 



Villus (mT-ws), pi. villi. One of the numerous minute vascular projec- 

 tions from the mucous membrane lining the small intestine, for ab- 

 sorbing digested food. 



Vitreous (vif-re-ws). Glass-like, as the clear, jelly-like, vitreous humor 

 of the eye. 



