CONTENTS. xxxi 



PAGE 



479. The phenomena and causation of vertigo 733 



480. Forced movements 735 



481. The parts of the middle brain concerned in the coordination of 



movements . 737 



SECTION III. 

 ON VOLUNTARY MOVEMENTS. 



482. The real distinction between voluntary and involuntary movements 739 

 483. The cortical motor areas of the dog ; the characters of the move- 

 ments resulting from cortical stimulation 740 



484. The cortical motor areas in the monkey 744 



485. The cortical motor areas in the anthropoid ape .... 748 

 486. The movements of cortical origin carried out by means of the 



pyramidal tract ; the nature of the movements so carried out . 749 

 487. The results of the removal of a cortical area in dog and in the 



monkey 762 



488. The cortical motor areas in man ; the area for speech . . . 764 

 489. The nature of the action of a motor area in carrying out a volun- 

 tary movement ; the characters of aphasia. The same as illus- 

 trated by the area for a limb in the dog ; the influence of 



sensory impulses 769 



490. The relations of the motor area to other parts of the central nervous 

 system ; the motor area employed in movements usually called 



involuntary 773 



491. The passage of volitional impulses along the spinal cord in animals 774 



492. Their passage in man 775 



493. A summary of the chief facts concerning the carrying out of 



voluntary movements , . . 776 



SECTION IV. 



ON THE DEVELOPMENT WITHIN THE CENTRAL NERVOUS SYSTEM OF 

 VISUAL AND OF SOME OTHER SENSATIONS. 



494. Visual impulses and sensations ; visual fields, and binocular vision 781 

 495. The decussation of the optic nerves in the optic chiasma . . . 784 

 496. The course of the optic tract. The endings of the optic tract in the 

 lateral corpus geniculatum, the pulvinar and the anterior corpus 

 quadrigeminum ; the results of degeneration and atrophy experi- 

 ments 785 



497. The connection of the three above bodies with the cerebral cortex ; 

 the meaning of the terms, blindness total and complete or par- 

 tial, hemianopsia, amblyopia. The difficulties of interpretation 

 attending experiments on the vision of animals .... 787 

 498. The nature of the movements of the eyes caused by stimulation of 



the occipital cortex 790 



499. The effects on vision of removing parts of the occipital cortex in 



monkeys and in dogs ; the teachings of clinical histories . . 791 



