THE CEREBELLUM. 



245 



The superior lamina of the medullary body joins the cere- 

 bellum immediately to the pons. The superior lamina is made 

 up of three pairs of connecting bands (cerebellar peduncles) 

 and the superior medullary velum. It constitutes all the pro- 

 longations of the corpus medullare of the cerebellum, except 

 the inferior velum (Fig. 91). 



The brachia conjunctiva (superior peduncles, Figs. 78 and 

 86) converge as they pass forward and upward to the inferior 



o p q r 



Fig- 77- Anterior aspect of cerebellum. (Original.) 



a. Horizontal sulcus. b. Flocculus, c. Tonsil, d. Superior medullary velum, e. Lob- 

 ulus centralis. f. Culmen monticuli. g. Inferior medullary velum, h. Brachium conjunc- 

 tivum. i. Restiform body. j. Brachium pontis. k. Peduncle of flocculus. 1. Division in 

 biventral lobule, m. Lobulus gracilis. n. Lobulus biventer. o. Prepyramidal sulcus. 

 p. Nodule, q. Uvula, r. Depression in tonsil, s. Postnodular sulcus. 



quadrigeminal colliculi, where they disappear. They are joined 

 to one another by a thin plate of white matter, the superior medul- 

 lary velum (velum medullare superius}. With the velum, they 

 form the roof and lateral boundaries of the superior half of the 

 fourth ventricle. They gradually bury themselves in the pons 

 as they proceed upward toward the corpora quadrigemina. Be- 

 neath the corpora quadrigemina and the cerebral aqueduct, 

 the brachia conjunctiva cerebelli decussate, and pass into the 



