414 THE BRAIN OF MAMMALS, BY TH. MEYNERT. 



The small but unquestionable nerve corpuscles referred to must not 

 be confounded with elements appearing like free nuclei which Luys 

 (in the corpus striatum) regards as nerve corpuscles connected with 

 the fibres of the cerebellum that pass through medullary fasciculi of 

 the crus cerebri into its grey matter. These chains of apparent nuclei, 

 parallel to the fasciculi, are simply the nodal points of the reticulum 

 of connective tissue in the medulla, a common character of the 

 latter. 



The first link of the projection system presents four forms of 

 connection with the corpus striatum. 



1. Radiating fasciculi proceeding from the whole length of 

 the arch of the hemisphere. 



2. An arcuate fasciculus from the cortex of the apex of the 

 temporal lobe, which, running along the internal border of 

 the corpus striatum, penetrates into the most anterior regioa 

 of its caput, as the stria cornea. 



3. Connecting fibres between the cortex of the olfactory 

 lobe and the corpus striatum, consisting partly of superficial 

 fibres proceeding from the bulb, and partly of deep fibres 

 from the medulla of the olfactory lobe (fig. 238, m'). Those 

 portions of the medulla of the olfactory lobe that pass into the 

 anterior commissure appear to traverse the substance of the 

 corpus striatum in an uninterrupted manner. The medullary 

 fibres of the olfactory lobe pass also through the nucleus septi 

 pellucidi in the form of arcuate fasciculi. 



4. The cortical substance of the septum is likewise connected 

 with the basal mass of the corpus striatum, by means of the 

 pedunculus septi. 



The basal region of the caput of the corpus striatum exhibits, 

 from above the lamina perforata anterior to near the height of 

 the passage of the anterior commissure, a structure differing 

 from that of the remaining portion of the corpus striatum. This 

 still awaits a monographical exposition, but it may be here 

 stated that it presents two remarkable characters (1) a close 

 aggregation of small forms of nerve corpuscles into circum- 

 scribed nuclear-like structures, and (2) the presence of ex- 

 tremely small granules (6 JJL in diameter), which are nowhere 

 else to be found in the cerebral ganglia, and which, aggregated 

 into dense clusters, lend to this region, traversed by the me- 



