392 GLOSSARY 



Thy'mus gland (Gr. thumos, the sweetbread) : a ductless gland in the 

 thorax behind the sternum. Its function is unknown. 



Thy'roid cartilage (Gr. thureoeides, shield-shaped) : a sheet of carti- 

 lage on the front of the larynx. 



Thyroid gland : a ductless gland of unknown function in the region 

 of the larynx. 



Tib'i-a (Lat.) : the inner and larger of the two bones of the lower 

 leg. 



Tis'sue : one of the materials of uniform structure forming the body, 

 as muscular tissue. 



Ton'sil (Lat. tonsilla} : one of a pair of oval bodies situated in the 

 recesses on each side of the fauces. 



Touch corpuscles: one form of touch end organs. 



Tox'in (Gr. toxikon, poison) : a poisonous kind of the animal base 

 or alkaloid which is formed in the putrefaction of albuminous 

 matter. 



Tra'che-a (Gr. trachus, rough) : the windpipe. 



Trans'verse ligament: a band of strong tissue dividing the large 

 neural ring of the atlas into two parts, into one of which the odon- 

 toid process fits. 



Tri'ceps (Lat., having three heads, from ires, three, and caput, head) : 

 the muscle at the back of the upper arm. 



Tri-cus'pid valves (Lat. tres, three, and cuspis, point) : the valves 

 guarding the opening between the auricle and ventricle on the 

 right side of the heart. 



Tri-gem'i-nal nerves (Lat. trigeminus, born three together) : the fifth 

 pair of cranial nerves. 



Troch'le-ar nerves (Lat. trochlea, a pulley) : the fourth pair of cranial 

 nerves. 



Troph'ic nerves (Gr. trophe, nourishment) : nerves which directly 

 influence the nutrition of the tissues to which they go. 



Tu-ber'cu-lin : a liquid prepared from cultures of the tubercle- 

 bacillus, as a remedy for tuberculosis. 



Tu-ber-cu-lo'sis (Lat. liiberculum, diminutive of tuber, tuber) : a disease 

 affecting most of the tissues, and characterized by the formation of 

 tubercles and the tubercle-bacillus. 



Tur'bi-nate bones (Lat. turbinatus, shaped like a top or cone): two 

 small bones in the nostril chambers. 



Tym'pa-num (Lat., a drum) : the middle ear. The membrane of the 

 tympanum is the eardrum. 



