490 GLOSSARY 



Menin'ges. [The pi. of Gr. vienigx, " membrane."] Term ap- 

 plied to the three membranes that invest the brain and spinal 

 cord. 



Mes'entery. [From the Gr. mesos, " middle," and enteron, the " in- 

 testine."] A duplicature of the peritoneum covering the small 

 intestine, which occujiies the middle, or centre, of the abdominal 

 cavity. 



Mes'oblast. [From the Gr. mesos, " middle," and blastos, a " germ " or 

 " sprout."] The middle layer of the germinal membrane. 



Mesoco'lon. A dupUcature of the peritoneum covering the colon. 



Mes'oderm. [From the Gr. mesos, " middle," and derma, the " skin." 

 The middle germinal layer of cells lying between the ectoderm and 

 entoderm. Same as mesoblast. 



Metab'olism. [From the Gr. metabole, " change."] The changes taking 

 place in cells, whereby they become more complex and contain more 

 force, or less complex and contain less force. The former is construc- 

 tive metabolism, or anaboUsm; the latter, destructive metabolism, 

 or kataboUsm. 



Metacar'pus. [From the Gr. m£ta, " after," or " beyond," and karpos, the 

 " wrist."] The part of the hand comprised between the ivrist and 

 fingers. 



Metatar'sus. [From the Gr. meta, " after," or " beyond," and tarsos, the 

 " instep."] That part of the foot comprised between the instep and 

 toes. 



Mi'tral. ResembUng a mitre. 



Mo'lar. [From the Lat. mola, a " mill."] A term applied to the teeth, 

 wliich bruise, or grind, the food. 



Monosaccharid. [From the Gr. monos, " one, single," and sakcharis, 

 " sugar."] A simple sugar. CeHnOs- 



Mo'tor Oc'uli. [Lat.] Mover of the eye. 



Mu'cin, the chief constituent of mucus. 



Mus'cle. [From the Gr. mus, " muscle."] A kind of animal tissue con- 

 sisting of bundles of fibres whose essential physiological characteris- 

 tic is contractiUty. 



Myocar'dium. [From the Gr. mus, mnos, a " muscle," and kardia, the 

 " heart."] The muscidar structure of the heart. 



Myo'pia. [From the Gr. 7nu6, to " contract," and dps, the " eye."] 

 Nearsightedness. 



My'osin. Cliief protein substance of muscle. 



