576 



THE CRANIAL NERVES. 



able distance upward and inward, in company with the nerve roots, to- 

 ward the hypoglossal nucleus ; and in the sheep, the tracts of fibres con- 

 necting the two nuclei are very evident. According to Henle, in some 



No 



xn 



TRANSVERSE SECTION OF THE HUMAN MEDULLA OBLONGATA, through the 

 middle of the hypoglossal nucleus and the olivary body. No. Olivary nucleus. R. Raphe 

 Ngl. Nucleus of the glossopharyngeal nerve. Nv. Nucleus of the pneumogastric nerve. 

 Nh. Nucleus of the hypoglossal nerve. IX. Glossopharnygeal nerve roots. XII. Hypoglossal 

 nerve roots. Magnified 8 diameters. (Henle.) 



transverse sections through the hilum, or opening of the olivary body 

 (Fig. 182), fibres from the hypoglossal nerve roots may be seen bending 

 round the inner border of the nucleus into its interior ; while other fibres 

 emerge in a corresponding manner from the opposite edge of the hilum 

 and continue onward, with the main root-bundles, to the hypoglossal 

 nucleus. Although the details of minute anatomical structure in these 

 parts have not been fully made out, it is evident that a close relation of 

 some kind exists between the gray matter of the olivary bodies and the 

 liypoglossal nucleus and roots. 



