394 GLOSSARY 



Vis'ce-ra (Lat., plu. of viscus, perhaps akin to Eng. viscid) : the organs 

 contained in the abdomen. 



Vital knot : the nervous center in the medulla oblongata which pre- 

 sides over the coordination of the respiratory movements. If the 

 medulla be divided below this center respiration ceases and death 

 results. 



Vit're-ous humor (Lat. vitreus, of glass) : the jellylike substance fill- 

 ing the posterior chamber of the eyeball. 



Viv-i-sec'tion (Lat. vivus, living, and sectio, a cutting) : dissection of 

 a living body. 



Vo'cal cords (Lat. vox, vocis, voice) : bands of elastic tissue in the 

 mucous membrane of the larynx which act upon the air like the 

 reeds of a musical instrument to produce musical sounds. 



Vo'mer (Lat., a plowshare) : a small bone forming part of the parti- 

 tion between the nostrils. 



Yellow Spot : an area about one twenty-fourth of an inch in diameter 

 in the retina of the eye, upon which the most definite images are 

 formed. 



