462 ANATOMICAL TECHNOLOQT. 



" The Lobi olfactorii (L. ol.) are made somewhat too prominent ; there is considerable 

 difference among cats in this respect, although much less than among dogs. 



" The general features of the cerebellum {cbl.) are well shown. The Lobi laterales 

 {L. I.) have only a fair proportion to the median lobe or vermis (vm.), instead of the pre- 

 ponderance which they have in the human brain The lateral contortion which charac- 

 terizes the caudal aspect of the vermis in adult cats (as shown in my paper, 11, 221, PI. I, 

 Fig. 1 and 2) does not affect the dorsal part. 



" As already stated, the fissures of the hemispheres are differently represented upon the 

 two sides. The combination of the two kinds of fissural arrangement in a single figure 

 serves to illustrate the extent of the lateral variation and compensation to which attention 

 was caUed by me in 1873 (11, 282)." 



§ 1160. Fig. 2. — The sinistral aspect of the brain. From Prep. 288 ; x 2. 

 Compare with Fig. 124. 



The Lobus olfactorius (L. ol.) is made somewhat too prominent. The curved line 

 upon its lateral surface indicates, approximately, the boundary of the more cephalic por- 

 tion of the pero or ectal layer, whence arise the Nervi olfactorii. These nerves are not 

 shown. 



The features of the Crus olfactorium indicated by Im. ein. and Im. alb. are more fully 

 shown upon Fig. 3. 



The Nervus opticus (iV". op.) projects from the ventral margin of the figure, and the 

 Fissura Sylviana {F. S.) is seen dorso-caudad of it. 



The ventral end of this fissure, as is always the case in the cat, joins the fissure which 

 forms the dorsolateral boundary of the Tractus olfactorius (Tr. ol.), and the cephalic and 

 caudal divisions of that fissure are called respectively rhinalis and postrhinalis iFP. rh. 

 and prh.). So much of the hemisphere as lies caudad of the F. Sylviana forms the Lobus 

 temporalis {L. imp.), the ventral extremity of which is the Lobulus hypocampae {LI. 

 hmp.). 



The cerebellum (cbl.) presents the narrow median lobe or vermis (vm.), and the Lohis 

 lateralis {L. I.). Near the ventro-cephalic angle of the latter, two or three of the laminae 

 of the second tier project as the Lobulus appendicularis (LI. ap.), which is seen better in 

 Fig. 3. 



The metaplexus shown in Fig. 3 (mtpx.) has been removed so as to expose the promi- 

 nent Eminentia auditoria (Em. an.), whence springs the N. auditorius (i\r. au.). 



Just ventrad of the eminence is the trapezium (tz.), and cephalad of this is the 

 pons ipn.). 



Between the pons and the hemisphere appears a part of the Crus cerebri (Or. cb.), and 

 cephalad of this is the slender N. trochlearis {W. tr.), which, by inadvertence, seems to 

 emerge from the F. postrhinalis instead of from between the cerebellum and the hemi- 

 sphere. 



The N. trigeminus {N. trg) has been cut short, in order the more clearly to show that 

 it usually emerges just caudad of the pons, and not through it as in man. 



The remaining nerve origins are indicated only by dots. Those of the NN. glosso- 

 pharyngeus, vagus and accessorius {NN. gph., v. and ac.) form a series. At the side of 

 the myelon, near the dorsal and ventral borders, are seen the origins of the first cervical 

 nerve {N cv. 1). 



In this figure the fissures are accurately represented as they are in the preparation, 

 excepting that the small F. lunata {P. In.) has been added from Prep's 519 and 520. The 

 small F. intermedia might well have been inserted between the dorsal ends of the FF. 

 anterior and postica {FF. a. and p.). 



