332 



LABORATORY MANUAL OF HUMAN ANATOMY 



End-brain (Telencephalon). 



Note that it consists of the optic part of the hypothalamus 

 (pars optica hypothalami) and the hemisphere (hemisphaer- 

 ium). 



Hemisphere (Hemisphaerium). 



This includes the brain-mantle (pallium), the olfactory brain 

 (rhinencephalon) , and the striate body (corpus striatum). The 

 fissura longitudinalis cerebri was examined before the hemi- 

 spheres were separated. Locate now the transverse fissure of 

 the cerebrum (fissura transversa cerebri). 



FIG. 149. 



Fissura 



parieto- 



occipitalis 



Gyrus frontal is \ 

 inferior 



Pars orbitalis 

 Pars triangularis 



Pars opercularis '.! 

 Operculum 



The left cerebral hemisphere. Lateral aspect. (After Toldt, Anat. Atlas, Wien, 1903, 

 3Aufl., p. 777, Fig. 1194.) 



Brain-mantle (Pallium). 



Note its subdivision by fissures (fissurae cerebri) and grooves 



(sulci cerebri) into convolutions (gyri cerebri). What is the 



fference arbitrarily made between a " fissure " and a " sul- 



cus"? Besides the main gyri, there are others in the depth 



(gyri profundi) and small gyri connecting adjacent gyri, the 



o-called gyri transitivi (0. T. annectent gyri). On the basis 



cerebri note the petrosal impression (impressio petrosa) due to 



the petrous portion of the temporal bone. 



The student should begin his study of the topography of the 

 pallium with a careful examination of the lateral fissure of the 



