382 GLOSSARY 



Ma-nom'e-ter (Gr. memo*, thin, and metron, a measure) : an instru- 

 ment for measuring the pressure of gases and liquids. 



Master tissues : those tissues of the body which have to do with the 

 liberation of energy, viz. the muscular and nervous tissues. 



Mas-ti-ca'tion (Lat. masticare, to chew): the act of chewing the food. 



Matter : that of which the sensible universe and all bodies are com- 

 posed; anything which occupies space or is perceptible to the 

 senses. 



Max'il-la-ry bones (Lat. maxilla, jaw) : the bones of the jaws. 



Me-a'tus (Lat., a passage, from meare, to go) : a natural passage or 

 canal. The auditory meatus is a tube of cartilage continuous with 

 the pinna of the ear, and leading to the membrane of the tym- 

 panum. 



Me-dul'la (Lat., marrow) : a synonym for medulla oblongata. The 

 term is also applied to the marrow of bones, and to the deep inner 

 portions of the kidneys and other organs. 



Medulla ob-lon-ga'ta (Lat.) : the hindmost segment of the brain, 

 continuous with the spinal cord. 



Med'ul-la-ry cav-i-ty (Lat. medulla, marrow) : the cavity in a bone 

 which contains marrow. 



Medullary sheath : the layer of white matter immediately surround- 

 ing the axis cylinder of a nerve. 



Me-dul'la-ted : having the medullary sheath. 



Mem'bra-nous coch'le-a: a membranous tube of the internal ear; 

 also called the cochlear canal. 



Membranous lab'y-rinth: a closed sac of membrane lying in the 

 bony labyrinth of the ear. 



Mes'en-ter-y (Gr. mesenterion, literally, the middle intestine) : the 

 membrane or one of the membranes which connect the intestines 

 and their appendages with the hinder wall of the abdominal 

 cavity. 



Me-tab'o-lism ((Jr. metabole, change) : the processes by which living 

 cells transform into their own proper substance material brought 

 by the blood, and also break down and prepare for excretion 

 matter which has fulfilled its function ; anabolism and katabolism. 



Met-a-car'pus (Gr. meta, beyond, and karpos, the wrist) : the part of 

 the skeleton between the wrist and the fingers, consisting of five 

 bones. 



Met-a-tar'sus (Gr. meta, beyond, between, and torsos, the flat of the 

 foot) : that part of the skeleton between the ankle and the toes. 



