Method XX 125 



S. Lobus temporalis, separated from lobi frontalis and parietalis 

 by fissura cerebri lateralis (Sylvii). Identify gyrus temporalis 

 superior, sulcus temporalis superior, gyrus temporalis medius, 

 sulcus temporalis inferior, and gyrus temporalis inferior. 



e. Insula (Island of Reil, central lobe). — Open the sylvian 

 fissure by pulling aside the lobus temporalis sufiSciently to 

 expose the Insula to view, and note sulcus circularis (limit- 

 ing sulci), gyrus longus insulae, gyrus brevis insulae, and limen 

 insulae. 



X,. Rhinencephalon (limbic lobe). — Lobus olfactorius, consist- 

 ing of bulbus olfactorius, tractus olfactorius, and trigonum olfac- 

 torium with its striae medalis, intermedia, and lateralis. Area 

 parolfactoria (Broca's area), sulcus parolfactorius, substantia per- 

 forata anterior, and limen insulae. Gyrus cinguli, gyrus hippo- 

 campi, fimbria and fascia dentata hippocampi, fornix, corpus 

 mamillare, and lamina rostralis. 



IV. SECTIONS OF ENCEPHALON. 



With the aid of a dissecting lens make careful drawings of 

 the cut surfaces exposed in the sections made as suggested 

 below. Pay special attention to the identification and interrela- 

 tionship of the structures enumerated under each section. 

 Attach the names to all the structures identified and number the 

 drawings in series. The first drawing will be No. 5, thus 

 including in the series the four drawings of the sections of the 

 medulla spinalis. 



To better realize or keep in mind the relation of each sec- 

 tion to the part from which it is taken and to the section pre- 

 ceding, it is advised that the sections be rendered one at a 

 time. Complete the study and the drawing of each section 

 before the next is removed from the specimen. 



It must be remembered that of the various structures pres- 

 ent in a section only the coarser and more evident structures 

 are enumerated under that section. The more detailed study 

 necessitates the special methods for the preparation of the 

 tissue and the use of the compound microscope. 



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