454 GLOSSARY 



SyTvi-an fissure, the deep fissure extending backward upon each side 



of the brain. It was named after the French physician Sylvius, who 



died in 1555. 

 Sym-pa-thet'ic system, the collection of nerve cells and nerves which 



control the preparation of food and its distribution to the cells. It 



is subordinate to the spinal cord. 



Syn-o'vi-a, the fluid which lubricates the movable joints. 

 Syn-o'vi-al membrane, the membrane lining the movable joints. 

 Sys'tem (Gr. sunistanai, to place together), a series of tissues and 



organs, working together for a definite purpose. 

 Sys'to-le (Gr. sun, together, and stellein, to set), the contraction of 



the heart forcing blood into the arteries of the body. 



Tan'nin (Fr. tan, originally meaning oak), an acid found in the barks 

 of most trees, and used to toughen and harden skins into leather. 



Tape worm, a kind of worm inhabiting the intestine. It resembles a 

 long piece of white tape. 



Tar'sal bones (Gr. tarsos, the sole of the foot), the seven irregularly 

 shaped bones in the hinder half of the foot. 



Tar'tar, a kind of hard, brown substance which often forms upon the teeth. 



Tau-ro-chol'ic acid, one of the waste substances in the bile. 



Tem'po-ral (Lat. tempora, the temples), pertaining to the regions of 

 the skull in the neighborhood of the ears. 



Ten'don (Lat. tendere, to stretch), a strong white cord, one end of 

 which is attached to a muscle above a joint, and the other to a bone 

 or to flesh below a joint. 



Thoracic duct, the tube running upward upon the backbone and con- 

 veying lymph to the veins. 



Tho'rax (Gr. thorax, breastplate), the cavity of the body under the 

 ribs. 



Thy'roid (Gr. thureos, a shield, and eidos, form). The large folded 

 cartilage which forms the principal part of the larynx. 



Tib'i-a (Lat. tibia), the shin bone. 



Tissue (ti'shu), a group of cells or fibers alike in form and action. 



To-bac'co (West Indian tabaco, the name of the pipe used in smoking), 

 a narcotic plant used for smoking and for chewing. 



Ton'sil (Lat. tonsilld), a round body situated one on each side of the 

 throat in front of the pharynx. They have no special use. Some- 

 times they become enlarged, and need to be removed. 



