498 



A MANUAL OF VETERINARY PHYSIOLOGY 



deliberately performed as though the animal were turning to look 

 at something behind it. Below this area is that found for the face, 

 tongue, and lips, which is relatively the least excitable of all, and its 

 localisation the most uncertain. Stimulation produces lip move- 

 ments, protrusion and retraction of the tongue, but attempts at 

 mastication were rarely made. In lambs this centre is connected 

 with that of sucking, even to the peculiar tail-movements which 

 accompany the act in this animal. No tail-movements could be 

 evoked from this area apart from sucking. 



The exposed cerebrum was found, as in other animals, to be 

 deficient in sensation, painful or otherwise ; and extirpation of the 



Great longitudinal fissure 



Superior frontal 

 convolution 



Middle frontal 

 convolution 



Sylvian or arcuate 

 convolution 



Fourth parieto- 

 occipital convolution 



Third parieto- _ 

 occipital convolution 



Second parieto- 

 occipital convolution' 



First parieto- 

 occipital convolution 



Cerebellum 



— Coronal sulcus 



Splenial sulcus 

 Cruciate sulcus 



Ascending limb ot 

 Sylvian fissure 



Supra-Sylvian fissure 

 Lateral fissure 



Intermediate sulcus 

 Medial sulcus 



Fig. 151. — Brain of Sheep, Dorsal Aspect (Simpson and King). 



motor area led to no limb paralysis. The animal walked as well 

 without the superior frontal and middle frontal convolutions as 

 with them. Further, it was quite unaffected as the result of the 

 experimental procedure, and, when liberated, at once began to eat. 



It seems probable that localisation in the horse does not differ 

 greatly from that of the sheep, or at any rate is nearer to the 

 sheep than that of any other type as yet examined. The 

 remarkable feature is its comparative unimportance, which has 

 long been anticipated clinically (see below). We have already 

 seen that the chief outflow of motor fibres from the brain of the 

 sheep, and presumably of other herbivora, has a subcortical origin 

 from the mid-brain, pons, and medulla (p. 466). 



