262 ELEMENTS OF MAMMALIAN ANATOMY 



Met' a (be^-ond). 



Mes en ceph' a Ion {mcsos, middle; encephalon, brain): the mid-brain, consisting 



of tb ^ corpora quadrigemina and crura cerebri. 

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

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

 Mo no dac' tyl : one-toed, as in horse. 

 Mon' phy dont {monos, single; phyo, grow; odoiis, tooth): having only one set 



of teeth during life. 

 Men 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. 

 Morphorogy {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 {movcrc, to move) : a name given nerves stimulating muscles. 



Na ta tor' i al : amphibious, aquatic, swimming. 

 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 i^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 coxal bone or of structures 



near to it. 

 Oc cip' i tal (06, 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; oid, like) : relating to the tooth-like process of the axis. 



Dens. 

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

 Olec' ran on {olea, elbow; kranion, head): process of the ulna. 



men' turn: a fold of the peritoneum connecting the abdominal viscera. 



01 fac' to ry {olfacere, to smell) : pertaining to the nose. 

 Oph thai' mic {ophthalmos, eye): p rtaining to the eye. 

 Op tic {opiikos, to see) : relating to the eye. 



O' ra: mouth. 



Or' bit al {orhis, circle) : pertaining to the cavity for the eye. 



Or' gan : any part having a definite function. 



Or nith o del' phi a {ortiis, bird; delphus, womb): the oviparous mammals. 



Os: bone. 



O' va : plural of ovum. 



O va' le : oval. 



O vip' a rous {ovum, egg; par ere, to bring forth): those animals which deposit 



eggs instead of bringing forth living young. 

 O' Vum: egg. 



