

HIND-BRAIN OR RHOMBENCEPHALON 



783 



(5) The posterior external arcuate fibers also take origin in the gracile and cuneate 

 luclei; they pass to the inferior peduncle of the same side. It is uncertain whether 



Sensory root of T 

 Semilitnar gang. 



VII. 



FIG. 698. Primary terminal nuclei of the afferent (sensory) cranial nerves schematically represented; lateral 

 view. The olfactory and optic centers are not represented. 



FIG. 699. Diagram showing the course of the arcuate fibers. (Testut.) 1. Medulla oblongata anterior surface. 

 '<!.. Anterior_ median fissure. 3. Fourth ventricle. 4. Inferior plivary nucleus, with the accessory olivary nuclei. 5. 



Gracile nucleus. 6. Cuneate nucleus. 7. Trigeminal. 8. Inferior peduncles, seen from in front. 9. Posterior external 

 arcuate fibers. 10. Anterior external arcuate fibers. 11. Internal arcuate fibers. 12. Peduncle of inferior olivary 

 nucleus. 13. Nucleus arcuatus. 14. Vagus. 15. Hypoglossal. 





