P52 MARION HINES 
Marginal 
Velum 
Fissura hippocampi 
Hippocampus 
ia dentata+ Fissura Hiopocampu 
Locus of fascia dentata : Sule fenere Hipporomg ppocampus 
Hippocamp 
Lamina 7 Fascia dentata 
epithelialis 
p Primordium hippocampi 
Neopallium 
Lamina epithelialis 
Matrix 
ey ‘ie : 
i Intermediate Mespelvem 
Pyramid cell layer cell layer 
Pyramidal cell layer 
Subiculum Hippocampus 
Fissura hippocampi Fissura hippocampi 
Sulcus Cortex hippocampi 
Fascia dentata fimbrio- 7% 
dentatus / Alveus 
7~ Fascia dentata 
?~ Hippocampus 
Sulcus limifans hippocamp 
Primordium hippocampi 22) 
Sulcus limitans 
hippocampi 
Lamina epithelialis 
(thea 
C. Lamina epithelialis  D. 
Fig.51 These four pen-and-ink sketches were drawn either with the Edinger 
projection apparatus or were taken as tracings from photographs of known 
magnification. They show the relative histological development of the neopal- 
lium, the hippocampal formation, the fascia dentata and the lamina epithelialis, 
through a level which subtends the lateral choroid plexus itself or its primordium. 
Sketch A. X 352. No. 465, 16 mm. (section 11-2-6), University of Chicago 
Collection. The hippocampal region is clearly delineated by the thickened 
marginal velum, the thin matrix, and the great convexity toward the ventricular 
surface. Ventral to the hippocampal formation lies the lamina epithelialis, the 
site of the lateral choroid plexus evagination. Here it is a thick wall made up 
of many small undifferentiated cells. The matrix of the neopallium interdigitates 
with the marginal velum. The fissura hippocampi is a shallow groove beneath 
which lies the locus of the future fascia dentata. 
