DISSECTION OF THE HEAD AND NECK 



333 



cerebrum (fissura cerebri lateralis [Sylvii]), ordinarily known 

 as the " fissure of Sylvius. " Besides its main trunk (truncus), 

 observe 



(a) Posterior ramus (ramus posterior). 



(b) Ascending anterior ramus (ramus anterior ascendens). 



(c) Horizontal anterior ramus (ramus anterior horizontalis} . 



FIG. 150. 



Fissura longitudinalis cerebri, 



Polus frontalis \ 



Sulcus olfactorius 



Sulci orbitales 



Bulbus olfactorius 



,' _ Tractus olfactorius 



Polus temporalis 



Trigonum.^ 

 olfactorium 



Chiasma opticum. 4-.- 7 *-- 



Fissura col- 

 lateralis 



Sulcus tem^ 

 ralis inferior 



Isthmus gyri fornicati'' 



Striae olfactoriae, medialis, 

 intermedia, lateralis 



Substantia perforate 

 anterior 



Limen insulae 



Fissura cerebri 

 lateralis (Sylvii) 



Nucleus 

 amygdalae 



Pedunculus 

 cerebri (Basis 

 pedunculi) 



-Substantia per- 

 forata posterior 



Substantia 

 nigra 



Tegmentum 



Aquseductus cerebri 



(Sylvii) 



Lamina quadrigemina 



Gyrus fornicatus 



Polus occipitalis 



Splenium corporis callosi 

 Fissura longitudinalis cerebri 



Basal surface of the cerebrum. (After Toldt, Anat. Atlas, Wien, 1903, 3 Aufl., p. 775, Fig. 1191.) 



Lobes of Cerebrum (Lobi cerebri) and their Boundaries. 



The pallium has been subdivided arbitrarily into five lobes 



(1) Frontal lobe (lobus frontalis). 



(2) Parietal lobe (lobus parietalis). 



(3) Temporal lobe (lobus temporalis). 



(4) Occipital lobe (lobus occipitalis). 



(5) Island of Reil (insula). 



