608 GLOSSARY. 



Sigmoid. Parts are so called from their resemblance to ihe letter E ; from E, 



the letter Sigma, and etSo; likeness. 

 Sphenoid. From cipnv a wedge, and etSoi likeness ; shaped like a wedge. 

 Sphincter. The name of several muscles, whose office it is to shut up the apert- 

 ure around which they are placed ; from (r^iyyco to shut up. 

 Splanchnic. From iy!T\ayxvoi an entrail. 



Symphysis. A connexion of bones ; from avfitpvio to grow together. 

 Synarthrosis. A connexion of bones ; from cw with, and apdpov a joint. 

 Synchondrosis. A species of union of bones by means of cartilage ; from aw 



with, and ■^ovipo; a cartilage. 

 Synneurosis. A species of connexion of bones by means of membrane ; from aw 



with, and vevpo^ a nerve ; because membranes, ligaments, and tendons, were 



by the ancients considered as nerves. 

 Syssarcosis. A species of connexion of bones by means of muscle ; from aw 



with, and aap^ flesh. 

 Systole. The contractile motion of the heart and arteries ; from avuTcWa to 



contract. 



T. 



Tmdon. From tcivu to extend. 



Thorax. Qwpa^. The breast^or chest. 



Thyroid- From dvpeoi, a shield, and etSo; likeness ; shaped like a shield. 



Trachea. The wind-pipe ; so called from its roughness ; from rpaxvi rough. 



Trochanter. A process of the thigh-bone, so called from rpoxos a wheel. 



u. 



Ulna. A name for the cubit ; from oXcvn the cubit. 



Ureter. The canal which conveys the urine from the kidney to the bladder ; 



from «pov the urine. 

 Urethra. The passage through which the urine passes from the bladder ; from 



upov the urine. 

 Uvea. The posterior lamen of the iris, so called because in many animals it is 



of the color of unripe grapes ; from uva an unripe grape. 

 Uvula. The conical substance which hangs down from the middle of the soft 



palate ; so called from its resemblance to a grape. A dim. of uva a grape. 



V. 



Valves. From valves, folding doors. 



Vertebra. The bones of the spine are so called : from verto to turn. 



X. 



Xiphoid. So called from the resemblance to a sword ; from |i^of a sword, and 

 eiSas likeness. 



z. 



Zygoma. The cavity under the zygomatic process of the temporal bones ; from 

 ^vyoi a yoke. 



