344 



ANATOMY IN A NUTSHELL. 



(g) Calcarine fissure (from calcar, "a spur"), runs from near the rather 

 pointed hind end of the hemisphere upward and forward, and just beyond the 

 middle at the point where it receives the parieto-occipital, binds downward 

 and terminates beneath the rear end of the callosum. Encircling the callosum 

 is a fissure, called the callosal. 



(h) First tempro-sphenc tidal fissure is below the fissure of Sylvius on the 

 lateral surface of the brain. 



LESSON XCIX 



TllK PRINCIPAL LOBES OF THE CEREBRUM ARE: (Plates CLXXV). 



1. Frontal lobe is the anterior one of the cerebrum, separated from the 

 parietal by the fissure of Rolando or central fissure. 



2. Parietal lobe is the middle one of the vault of the cerebrum, separated 



PLATE CLXIV 



GERMINAL AREA 



NEURAL GROOVE 



PRIMITIVE STREAK 



FORE- BRAIN (RUDIMENT OF CEREBRAL HEMISPrtEKtS 

 OPTIC VESICLE 



FIRST CEREBRAL VESICLE 

 SECOND CEREBRAL VESICLE 

 THIRD CEREBRAL VESICLE 



MESODERM 



NEURAL CREST 



Showing Germinal Area. 



from the frontal by the central fissure. or fissureof Rolando and marked off from 

 the occipital by the parito-occipital fissure. It is divided by an intra-parietal 

 fissure int" a superior and inferior parietal lobe. 



'■'<. Occipital lobe is the posterior portion of the cerebrum marked off from 

 tin parietal lobe by the parieto-< iccipital fissure. 



4. Temporo-sphenoidal lobe, also called temporal, is the lobe of cerebrum 

 which occupies the middle cerebral fossa of the skull, it is separated from the 

 frontal and parietal lobes by the fissure of Sylvius. 



.">. The Central lobe or island of lb il is also called the lobule of the Sylvian 

 fissure, lobule of the corpus striatum is a portion of the cerebral cortex con- 





