GLOSSARY. 237 



Me a' tus (passage) : a channel or canal. 



Me' di ad (medius, middle) : toward the middle. 



Me' di al : pertaining to the middle. 



Me di as ti' num (standing in the middle) : the space between the lungs, 



including the heart and other organs. 

 Med' ul la ry (medulla, marrow) : pertaining to the marrow within the 



bones. 

 Men in ge' al (menigx, membrane) : pertaining to the membranes of 



the brain or cord. 



Men' tal (mentum, chin) : pertaining to structures about the chin. 

 Mes en ter' ic (mesos, middle ; enter on, intestine) : pertaining to the 



mesentery. 

 Mes' en ter y: a fold of the peritoneum joining parts of the intestine 



to the dorsal part of the abdominal cavity. 

 Met' a (beyond). 

 Mes en ceph' a Ion (mesos, middle; encephalon, brain) : the mid-brain, 



consisting of the corpora quadrigemina and crura cerebri. 

 Met en ceph' a Ion : the pons Varolii and cerebellum. 

 Mo di' o lus : the central pillar or axis of the cochlea. 

 Mon'ophydont (monos, single; phuein, to grow; odous, tooth): 



having only one set of teeth during life. 

 Mon o tre' ma ta (monos, single ; tremos, hole) : the lowest subclass of 



mammals. The intestinal and urinary products are voided through 



one opening as in birds ; duck bill and spiny ant eater. 

 Morphol'ogy (morpha, form; logos, discourse) : that part of biology 



dealing specially with form and structure. 

 My el en ceph' a Ion (myelos, marrow ; encephalon, brain) : the medulla 



oblongata. 

 Mo' tor (movere, to move) : a name given nerves stimulating muscles. 



Neu' ral (neuron, nerve) : pertaining to a nerve. 

 Neu' rone : a nerve cell with all its processes. 

 Nu' clei : plural of nucleus. 



Nu' cle us (nux, a nut) : the essential part of every cell; also applied 

 to a definite bunch of nerve cells. 



Ob' tu ra tor : the name of the large foramen in the innominate bone 



or of structures near to it. 

 Occip'ital (ob, against; caput, the head): relating to structures in 



the region of the back part of the head. 

 Oc' u lar (oculus, the eye) : pertaining to the eye. 

 O don' toid (odous, tooth; old, like) : relating to the tooth-like process 



of the axis. 



Oid: a common suffix derived from Greek eidos and signifying like. 

 O lee' ran on (olea, elbow; kranion, head) : process of the ulna. 



