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Nachdruck verboten. 
The Morphology of the Indusium and Striae Laneisii. 
By G. Extior Sure M.D., Ch.M. (Sydney) St. John’s College Cambridge 
(England). 
With 3 Figures. 
The nature of the thin film of grey matter (indusium griseum) 
which covers the dorsal aspect of the corpus callosum has been the 
subject of an extraordinary amount of speculation and research ever 
since LAancısıus wrote about it in 1718. And within recent years 
there have been very few neurologists who have not given expression 
to their views concerning the nature of the striae longitudinales and 
neishbouring structures. 
The literature of the subject has been carefully reviewed by Hon- 
EGGER (“Fornix” 1890), Fisa (“The Indusium” Journal of Compara- 
tive Neurology, Vol. III, 1893, p. 61—69) and KoELLIKER (“Gewebe- 
lehre”, Bd. 11, 2. Hälfte, 1896, p. 770—774). The view currently 
held at the present time is that to which HonE@GER gave expression 
in 1890, a view which many writers before and since his time have 
upheld. Briefly stated this view is that the fascia dentata is conti- 
nuous round the splenium with the stria medialis (stria alba 
vel nervus Lancisii) and that the Striae laterales (taeniae 
tectae) are continued into the gyrus hippocampi. 
The writings of VALENTIN, JASTROWITZ, GIACOMINI, GOLGI, RA- 
MON y CAJAL, OBERSTEINER, DEJERINE and KOELLIKER indicate the 
growth of this view. From the morphological and developmental side 
it has been supported to a certain extent by the works of ZucKER- 
KANDL, BLUMENAU, MARCHAND and PAuL Martin. Other writers, 
among whom may be mentioned GANsER and Duvat, have denied the 
connection of indusium with the hippocampus at all. 
HENLE is the only anatomist of whose writings I am cognisant 
who even so much as hints at the true nature of the indusium. 
To quote KoOELLIKER (l. c. p. 771): “Nahe der Oberfläche und 
parallel derselben erscheint am hinteren sanften Abhange des Wulstes 
ein plattes Band kleiner, dicht gedrängter Elemente von 0,012 mm, 
welches unzweifelhaft der Anfang der Körnerlage der Fascia dentata 
ist, während die tieferen Zellen denen der Endplatte des Ammons- 
