132 



ANATOMY OF VERTEBRATES. 



fissures, more or less parallel with 7'. The principal folds denned 

 by the above fissures are : — a, posthippocampal, k, callosal, k' , 

 supercallosal, h, marginal, K, postmarginal, t, falcial, f, subfalcial 

 (which is the inner surface of c, entorhinal), p' , entolambdoidal, s, 

 septal. 



Anthropotomists have primarily divided the hemispheric masses 



Vertical section, half nat. size, Human Brain. XL". 



into groups of convolutions or ( lobes :' some into three, viz., the 

 ( anterior,' e middle,' and ( posterior ' lobes ; others into five. 

 These latter are termed ( central ' {lobus centralis), f frontal ' 

 globus frontalis), *■ parietal ' {lobus parietalis), i temporal ' {lobus 

 temporalis), * occipital ' {lobus occipitalis). 



The central lobe {' Stammlappen,' Huschke) answers to the 

 c Insel ' of Reil, and is not visible outwardly ; it includes the 

 ( gyri breves,' and is, by some, held to be peculiar to Quadru- 

 mana and Bimana (but see figs. 117, \\%,f,f). 



The c frontal lobe,' fig. 119, F, includes so much of the anterior 

 lobe as lies in advance of the ( frontal fold,' n, n, and is subdivided 

 above into the superfrontal, n' , midfrontal, n" ' , subfrontal, n" , 

 ectofrontal, ?^ x , and l prefrontal,' w xx , folds : it is an artificial division 

 of the part, most naturally defined, both in Quadrumana aud 

 Man, by the coronal fissure, 12, from the rest of the hemisphere. 



