CONTENTS. ix 



SECTION IV. 



THE AUTOMATIC ACTIONS OF THE SPINAL CORD. 



PAGE 



595. Automatic actions of the spinal cord in the frog and in the dog . 920 



596. Automatic activity dependent on afferent impulses .... 921 



597. Tone of skeletal muscles 922 



598. Tendon phenomena, knee jerk 926 



599. Rigidity of muscles through spinal action 927 



CHAPTER II. 

 THE BRAIN. 



SECTION I. 



ON SOME GENERAL FEATURES OF THE STRUCTURE OF THE BRAIN. 



600. The embryonic brain ; the three primary cerebral vesicles . . 929 



601. The transformation of these into the bulb and fourth ventricle, the 

 cerebellum and pons varolii, the crura cerebri, corpora quadri- 

 gemina, and third ventricle 930 



602. The vesicles of the cerebral hemispheres, their growth and trans- 

 formation into the cerebrum; the cerebral hemispheres, corpus 

 striatum, corpus callosum, fornix, and choroid plexus . . . 930 



603. The parts of the adult brain corresponding to the main divisions of 



the embryonic brain 935 



604. The cranial nerves 936 



SECTION II. 

 THE BULB. 



605. The main changes by which the cervical spinal cord becomes trans- 

 formed into the bulb; the pyramids and their decussation, the 

 olivary bodies, the fasciculus cuneatus and fasciculus gracilis . 937 



606. The superior or sensory decussation 942 



607. The opening up of the central canal of the spinal cord into the 



fourth ventricle of the bulb ; the calamus scriptorius . . . 943 



608. The changes in the grey matter: the reticular formation and the 



arcuate fibres 944 



609. The olivary nucleus, or inferior olive, the inner and outer accessory 



olivary nuclei, the antero-lateral nucleus 945 



610. The gracile and cuneate nuclei; the changes in the gelatinous 



substance of Eolando 947 



611. The fibres of the bulb 948 



612. The relations of the gracile and cuneate nuclei to the inter-olivary 



layer, to the fillet, and to the restiform body .... 949 



