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 Eeil this stratum is considerably developed, and is somewhat sepa- 



-* 



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

 FASCIA AND FIMBHIA. 



Gh, part of the gyms hippocampi or uncinate convolution ; Fd, fascia dentata, or dentate 

 convolution; between them is the dentate fissure ; f'i, flmbria, composed of longitudinal 

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

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

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

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

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

 deutata ; , 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 



