Medulla Oblongata. 



Ill 



Medulla < 

 oblongata 



&ulc. longit, 

 (inter. 



7. N. TRIGEMIN. 



TI.N. ABDUC. 

 ,Vtt.N. FACIAL 

 .N.ACUSI 



IK. N. GLOSSO- 

 PHAB. 



'. N. VA&US 



N. HYPOGLOSS. 



21. N. RECURR. 

 N, CERVICAL. I, 



452, Pons Varolii and Medulla Oblongata, view from below. 



Natural size. 



The Medulla oblongata s. Bulbus medullae spinalis, is continuous below 

 with the spinal cord, on a level with the lower margin of the Foramen 

 magnum; on each side, separated by fissures, are three columns. In 

 the middle' line, separated by the anterior longitudinal fissure, 

 Sulcus longitudinalis anterior, are the two pyramids, Pyramides ; external 

 to these, are the olivary bodies, Olivae, at their sides, the resti- 

 form bodies, Corpora restiformia, which, because they enter the hemi- 

 spheres of the cerebellum, are also called the inferior peduncles of 

 the cerebellum. -In the anterior longitudinal fissure the decussation 

 of both pyramids, Decussatio pyramidum, is visible. In the substance of 

 the olive is a white Nucleus s. Corpus dentatum olivac, surrounded by a 

 grey, serrated lamina (see Fig. 462). 



After removal of the Medulla oblongata (separation of the restiform 

 bodies and loosening from the Pons Varolii) a' complete view of the under 

 surface of the cerebellum is obtained. The two hemispheres of 

 the cerebellum are separated from each other by a deep fossa, the val- 

 ley, Vallecula Eeilii. In this fossa, the Medulla oblongata, just removed, 

 was contained; the fossa ends posteriorly in the Incisura marginalis 

 posterior. 



