204 



THE ESSENTIALS OF HISTOLOGY 



4. A thin layer of numerous small irregular angular cells. 



5. A rather thicker layer of small scattered cells, many of a fusi- 

 form shape. This layer lies next to the white centre. In the island 

 of Keil this stratum is considerably developed, and is somewhat sepa- 



" *"..,. -=*fPflflM^5^*^ >{ 



v i .-SsSJT > * ^fv_' *. . uX3S35s^ 



FIG. 240. SECTION ACROSS THE HIPPOCAMPUS MAJOR, DENTATE FISSURE, DENTATE 



FASCIA AND FIMBRIA. 



Gh, part of the gyras hippocampi or iincinate convolution : Fd, fascia dentata, or dentate 

 convolution; between them is the dentate fissure; Ft, fimbria, composed of longitudinal 

 fibres here cut across ; 1, 2, medullary centre of the hippocampal gyrus prolonged around 

 the hippocampus, //, as the so-called alveus, into the fimbria ; 3, layer of large pyramidal 

 cells ; 4, their processes (stratum radiatum ) ; 5, reticular neuroglia (stratum laciniosum ) ; 

 6, superficial medullary lamina, involuted around the dentate fissure ; * *, termination of 

 this lamina, the fibres here running longitudinally ; 7, superficial neuroglia of the fascia 

 dentata ; *, ring of small cells within this (stratum granulosum). 



rated from the rest of the grey matter by a layer of white substance. 

 It is known as the claustrum. 



From the white centre bundles of medullated nerve-fibres pass in 

 vertical streaks through the deeper layers of the grey matter, to lose 



