324 ELEMENTARY PHYSIOLOGY. [XXX. 



been cut off) continuous posteriorly with the 

 olfactory tract ; pull this a little outwards, it 

 is unconnected with the brain except posteriorly 

 where it runs into the olfactory lobe. 



2. Behind the olfactory lobe is a somewhat pear- 

 shaped bulging, the lateral part of the uncinate 

 lobe. 



3. Cut the brain in half through the median longi- 

 tudinal fissure, press down the cerebellum and 

 follow the course of the uncinate lobe in the 

 posterior part of the cortex ; it curves round as 

 a rather narrow band and then runs upwards to 

 the end of the corpus callosum, it runs also a 

 little forwards underneath the corpus callosum 

 (cp. A. 17). 



4. At the end of the corpus callosum it joins the 

 supra-callosal convolution which runs for- 

 wards above the corpus callosum. 



5. It will be seen that the above convolutions form 

 a nearly complete ring round the cortex, they 

 are all parts of the internal convolution or 

 limbic lobe. 



G. Turning back now to the side of the brain, note 

 the deep Sylvian fissure running upwards and 

 backwards from about the apex of the part of 

 the uncinate lobe here seen (cp. 2) ; around 

 this curves the first or Sylvian convolution. 



7. Curving dorsally around this is the second or 

 inferior convolution. 



