GLOSSARY. 371 



Aq'ue-duct of Syl'vi-us : a channel connecting the third and fourth 



ventricles of the brain. Named from the famous anatomist Dubois 



or Sylvius (the latinized form of the name). 



A'que-ous hu'mor : the fluid filling the anterior chamber of the eyeball. 

 A-rach'noid (Gr. arachnoeides, like a cobweb) : the middle one of the 



three membranes of the brain and spinal cord. 

 A-re'o-lar tissue (Lat. areola, diminutive of area, a broad space of 



level ground) : a fibrous connective tissue with loosely woven 



fibers and many spaces. 

 Ar'gon (Gr. argos, lazy, inert) : a gas forming about one per cent of 



the atmosphere ; first recognized in 1895. 

 Ar'ter-y (Gr. or Lat. arteria, windpipe) : one of the tubes conveying 



blood from the heart. They were formerly thought to contain air 



and to be branches of the windpipe. 



Ar-tic-u-la'tion (Lat. articulatus, furnished with joints) : any junc- 

 tion between bones in the skeleton. 

 A-ryt'e-noid cartilages (Gr. arutainoeides, shaped like a ladle, from 



arutaina, ladle, and eidos, form) : two small cartilages of the 



larynx. 

 As-phyx'i-a (Gr. a-, without, and sphuzein, to throb, beat) : apparent 



death from stoppage of respiration, as in suffocation from drowning 



or the breathing of certain gases. 

 As-sim-i-la'tion (Lat. assimilatio, from assimilare, to make like) : the 



final process of anabolism, by which nutritive material is converted 



into the living substance of the body. 

 A-Stig'ma-tism (Gr. -, without, and stigma, stigmatos, prick of a 



pointed instrument, spot) : a defect of the eye due to irregular 



curvature of the refractive media, by reason of which rays of light 



from a point are not brought to a single focal point. It results 



in indistinctness of vision. 

 At'las (Gr., one of the gods who bears up the pillars of heaven) : the, 



first vertebra of the neck, supporting the weight of the head. 

 At'om (Gr. a-, without, and tomos, cut) : one of the ultimate indivisible 



particles of matter. 



Au'di-to-ry os'si-cles : the three small bones of the middle ear. 

 Au'ri-cle (Lat. auricula, diminutive of auris, ear) : a cavity at the base 



(upper portion) of the heart. 

 Au-to-in-tox-i-ca'tion (Gr. auto, self, and Eng. intoxication, poisoning) : 



a poisoning of the system from the products of physiological 



processes or from the reabsorption of waste matter.' 



