SECTIONS THROUGH THE BRAIN 31 



It may be recognised as a submerged area of cerebral cortex, 

 which is situated nearer to the frontal than to the occipital 

 pole and is overlapped by the adjoining cortical areas (Fig. 



FiG. 18. Horizontal Section through Left Cerebral Hemisphere. 



1. Island (of Reil). 



2. Lentiform nucleus. 



3. Claustrum. 



4. Posterior horn of lateral 



ventricle. 



5. Corpus callosum. 



6. Anterior horn of lateral 



ventricle. 



7. Septum pellucidum. 



8. Caudate nucleus. 



9. Internal capsule, an- 



terior limb. 



10. Column of fornix. 



IT. Internal capsule, genu. 



12. Internal capsule (motor 



fibres). 



13. Thalamus. 



14. Internal capsule (sen- 



sory fibres). 



1 8). On the deep surface of the white matter of the island, 

 and almost co-extensive with it, a thin sheet of grey matter is 

 cut through. This is termed the daustrum, and it is separ- 

 ated from the lentiform nucleus by a narrow strip of white 



