208 



HUMAN PHYSIOLOGY. 



FIG. 26. SIDE VIEW OF THE BRAIN OF MAN, WITH THE AREAS OF THE CERE- 

 BRAL CONVOLUTIONS ACCORDING TO FERRIER. 



The figures are constructed by marking on the brain of man, in their 

 respective situations, the areas of the brain of the monkey as determined by 

 experiment, and the description of the effects of stimulating the various areas 

 refers 'to the brain of the monkey. 



i. Advance of the opposite hind limb, as in walking. 2, 3, 4. Complex move- 

 ments of the opposite leg and arm, and of the trunk, as in swimming. 

 a, b, c, d. Individual and combined movements of the fingers and wrists 

 of the opposite hand. Prehensile movements. 5. Extension forward of 

 the opposite arm and hand. 6. Supination and flexion of the opposite 

 forearm. 7. Retraction and elevation of the opposite angle of the mouth, 

 by means of the zygomatic muscles. 8. Elevation of the alae nasi and 

 upper lip, with depression of the lower lip on the opposite side. 9, 10. 

 Opening of the mouth, with (9) protrusion and (10) retraction of the 

 tongue; region of aphasia, bilateral action. u. Retraction of the op- 

 posite angle of the mouth, the head turned slightly to one side. 12. The 

 eyes open widely, the pupils dilate, and the head and eyes turn toward 

 the opposite side. 13, 13'. The eyes move toward the opposite side with 

 an upward (13) or downward (13') deviation. The pupils are generally 

 contracted. 14. Pricking of the opposite ear, the head and eyes turn to 

 the opposite side, and the pupils dilate widely. 



