CHAP, ii.] 



THE BEAIK 



747 



it meets the area for the eyes, lies an area stimulation of which 

 produces movements of the pharynx or larynx as well as the 

 mouth or face, and which may be divided into areas for mastica- 

 tion, for swallowing, and for the production of the voice. 



We might speak of these several areas in another way by 

 referring to the nerves concerned in carrying out the several 

 movements, though in doing so we must remember that there is 

 not an exact correspondence between the relative position of a 



Pop 



FIG. 124. MESIAL ASPECT OF THE LEFT HALF OF THE BRAIN OF MACACUS, 

 DISPLAYED BY SECTION IN THE MEDIAN SAGITTAL PLANE AND REMOVAL OF 

 THE CEREBELLUM. Natural size. (Sherrington after Horsley and Beevor.) 



The hatched and stippled parts of the surface shew the regions of the cortex 

 connected with movements of the foot, knee, hip, tail, trunk, and neck 

 respectively. The several positions of the areas of cortex connected with 

 vision and smell and with cutaneous sensation are indicated by the appro- 

 priate words. 



The plane of section has passed through the corpus callosum, cc, cc, cc, and through 

 the anterior commissure, c, sparing the left pillar of the fornix, F; behind it 

 has bisected the anterior part of the pons, laying open the aqueduct, Aq. 

 (iter a tertio ad quartum ventriculum). Pons, the left half of the pons in 

 frontal section. Op. the optic commissure cut across. 



III. the root of the third cranial nerve. , . ; 



FB. the frontal pole, 0(7. the occipital pole ; Cn. the cuneus, Pen. the precu- 

 neus ; G. fn. G. fn. G-. fn. the gyrus f ornicatus ; the unlettered fissure seen 

 to form the upper boundary of this gyrus in its supra-callosal part is the 

 callaso-marginal, Po. f. the parieto-occipital fissure. 



muscle along the axis of the body or along the axis of a limb 

 and the relative position along the cerebrospinal axis of the nerve 

 or nerves governing the muscle. We may however, adopting 

 this method, note that the sacral and lumbar nerves are repre- 

 sented by the most mesial portion of the whole motor area and 

 by the hind division of this mesial portion ; that the lumbar and 

 thoracic nerves are represented by the front division of the same 



