324 LABORATORY MANUAL OF HUMAN ANATOMY 



VI. Abducent nerve (N. abducens). Emerges on each side at the junction 



of the pons with the medulla oblongata. 

 VII. Facial nerve (N. facialis). 



(a) Intermediate nerve (N. intermedius) (0. T. pars intermedia, 



or nerve of Wrisberg). 

 VIII. Acoustic nerve (N. acusticus) (0. T. auditory nerve). 



(a) Vestibular root (radix vestibularis) . This runs medial to 



the restiform body. 



(b) Cochlear root (radix cochlearis). This runs lateral from 



the restiform body. 



IX. Glossopharyngeal nerve (N. glossopharyngeus) . It may be difficult 

 to decide exactly how many fila radicularia belong to this nerve and 

 how many to X. and XI. 



X. Vagus nerve (N. vagus) (0. T. pneumogastric nerve). 

 XL Accessory nerve (N. accessorius) (0. T. spinal accessory). 

 XII. Hypoglossal nerve (N. hypoglossus) . Emerges between the oliva and 

 the pyramis, by several fasciculi (fila radicularia). 



Larger Subdivisions of the Brain. 



Note the subdivision into rhomboid brain (rhombencephalon) 

 and cerebrum, the junction being that between pons and mid- 

 brain. 



The rhombencephalon includes 



(a) After-brain (myelencephalon) (" medullary brain"). 



(b) Hind-brain (metencephalon), subdivisible into 



( ba ) Cerebellum. 



(bb) Pons [Varolii]. 



The cerebrum includes 



(a) Midbrain (mesencephalon) . 



(b) Forebrain (prosencephalon), consisting of 



(ba) Interbrain (diencephalon) and 



(bb) End-brain (telencephalon) . 



Examine carefully the longitudinal fissure of the cerebrum 

 (fissura longitudinalis cerebri) (0. T. great longitudinal fissure). 



The following table shows the derivatives of the three cere- 

 bral vesicles. 



