274 MORPHOLOGY OF THE CEREBRAL CONVOLUTIONS. 



Various authors : operculum; Klappdeckel ; opercule; 1'opercolo; coperchio; 

 convolution of Broca; circon volution spirale ; roof of Island of Reil. 



b. Gyrus supea-marginalis. 



Gratiolet : lobule du pli courbe. 



Lusanna e Lemoigne : circonvoluzione marginale. 



Huschke: lobulus tuberis. 



c. Gyrus angularis. 



Gratiolet: pli courbe. 



Ferrier, Huxley and others : angular gyrus. 



d. Gyrus occipitalis primus. 



e. Gyrus occipitalis secundus. 



f. Gyrus occilitalis tertius. 



These are the three bridging convolutions or plis de passage of Gratiolet, 



which Ecker calls first, second and third occipital gyri as above. 

 Huxley: annectant external gyri. 

 Lussana e Lemoigne: gyri abrupti e cuneiformi, piega occipitale de passagio. 



B. Median Surface. 



g. Gyrus uxcinatus. 



Usually mentioned by many names by each writer: gyrus uncinatus; 

 crotchet; gyrus Hippocampi; uncus gyri fornicati; subiculum cornu ammo- 

 nis ; the hook or reduplication of the uncinate gyrus. 



//. Gyrus dentatus. 



Hippocampal gyrus of some authors. 

 i. Gyrus paracentralis. 

 Named by Betz, who, with Mierzejewski. discovered here the so-called giant cells. 

 K. Gyrus precuneus. 



The quadrilateral lobule or prgecuneus ; Vorzwickel; avant coin. 

 L. Gyrus descendens. 



Between the rami of the fissura calcarina. 



C. Basilar Surface. 

 M. Gyriis rectus. 



N. Gyrtcs orbitalis medius. 



0. Gyrus orbitalis lateralis. 



Figs. 1, 2 and 3, PI. XXXIV, are diagrams of the human brain, with 

 the various fissures and convolutions numbered and lettered (see Explanation 

 of Plates) ; whilst figs. 4 and 5 give the corresponding parts as found in a simian 

 brain, Macacus nemestrinus. By means of these one can readily follow the succeed, 

 ing descriptions. 



