366 THE NERVE SYSTEM 



Lower Limbs. Back part of precentral and para- 

 central fissures. 



Trunk. Toward the front part, both on the under 

 and in the back superf rental fissure. 



Upper Limbs. Midportion of precentral fissure. 



Facial. Front part of precentral fissure. 



Tongue, Larynx, Muscles of Mastication, /V/a /////.<. 

 Frontal opercular part. 



Movements of Head and Eye. Medifrontal fissure, 

 adjacent to precentral fissure. 



Owing to a decussation of the pyramidal (motor) 

 tracts in their course to the primary motor centres, 

 the motor centres in one cerebral hemisphere control 

 the movements of the opposite side of the body. 



Sensor Areas. Tactile and temperature impressions. 

 Postcentral fissure, in corresponding order with the 

 neighboring precentral motor area; the postcentral 

 (sensor) and precentral (motor) fissures are so closely 

 associated in the highest category of the reflex arc 

 system represented in the cerebral cortex, that they 

 are included under the term of somesthetic or senso- 

 motor area devoted to the registration of cutaneous 

 impressions, impressions from the muscles, tendons, 

 and joints; in short, the sense of movement. 



Stereognostic Sense Area (concrete perception of the 

 form and solidity of objects). Parietal fissure and 

 its extension in the precuneus on the inner aspect. 



Auditory Area. Middle third of supertemporal, and 

 adjacent transtemporal fissures in the Sylvian cleft. 



Visual Area. Calcarine fissure and cuneus as a whole. 



Olfactory Area. Uncus, frontal part of hippocampus, 

 indusium, subcallosal fissures, parolfactory area, and 

 anterior perforated substance. 



Gustatory Area. Probably in region of the olfactory 

 area in the temporal lobe (uncinate and hippocampal 

 fissures ?) (not definitely settled). 



Language Areas. Emissive (articular) centre for 

 speech (control of muscles used in speech; larynx, 



