ANATOMY IN A NUTSHELL. 



255 



The vermis is the median lobe of the cerebellum; the vermiform process of 

 the cerebellum is divided into the prevermis and the postvermis. 



The olivary body is the ganglion of the oblongata lying on either side just 

 lateral of the pyramid, and forming an oval projection on the surface just below 

 the pons. It consists of the nucleus olivaris inferior with a covering and filling 

 of white matter, also called inferior olivary body, or inferior olive, and corpus 

 semiovale. 



The corpus dentatum is (a) a plicated capsule of gray matter, open an- 

 teriorily, situated within the white substance of each cerebellar hemisphere. 

 Also called ganglion of the cerebellum and nucleus dentatus. (b) A somewhat 

 similar mass of gray matter in each olivary body. Also called corpus ciliare. 



PLATE CLXXV. 



FISSURE OF ROLANDO. 



PERFORATING BRANCHES 



MIDDLE CEREBRAL A. IN FISSURE. OF SYLVIUS. 



Showing Distribution of Middle Cerebral Artery. 



The lateral tract is continuous with the lateral column of the spinal cord, 

 lies behind the olivary body and in front of the restiform. 



The restiform body is the inferior peduncle of the cerebellum, by which it 

 connects with the oblongata and parts below. It contains the direcl cere- 

 bellar-tract fibres, crossed and uncrossed from the posterior columns of thecord, 

 and fibres from the centra-lateral (lower) olive . 



The fillet is some special bundle of nerve-fibres; especially, a band of Longi- 

 tudinal fibres lying in the ventral and outer parts of the tegmental region of 

 the brain. Its distribution is not known, bu1 it seems to conned below with the 

 posterior columns of the spinal cord and above with the corpora quadrigemina, 

 optic thalami, lenticular nucleus, and cortex cerebri. It is also called lemniscus. 



A vesicle is a small, bladder-like structure, cavity cell, or the like, in a body. 

 There are three vesicles in the brain, anterior, middle, and posterior. They are 



