Freiburger historische Bestände - digital

Mr. Victor Horsley—Cranio-Cerebral Topography. 355

pole of the insula terminating just in front of (apparently) the genu of the
fissure of Rolando.

Laterally, the highest point of the squamous suture corresponds
(according to the same observer) with the centre of the insula, i. e. in a
large number of cases the fissure of Sylvius. Dalton (Series a, PI. iv.)
shows distinctly that in a sagittal section, the plane of which passes through
the second frontal gyrus, the hinder end of the island of Reil lies just in
front of the intraparietal (? postcentral) sulcus.

According to Fere\ the hindmost pole of the insula lies in the vertical
plane, through the upper end of the fissure of Rolando and the asterion;
but this would correspond with the hinder end of the posterior limb of the
fissure of Sylvius, a relation which is not suggested by any other author,
and which is certainly not in accord with my own observations directed to
this special point.

So far as the relative position of the insula to the character of the skull
is concerned, Altoukhoff has found that the insula extends rather further
at each pole in dolichocephalics than in brachycephalics. He also confirms
the description given above, except that while he gives in one plate the
average position of the posterior pole as corresponding with the lower end
of the intraparietal sulcus, i. e. the lower end of the sulcus postcentralis
inferior, in another plate, wherein the characteristics of the skull are
compared, he makes this point of the insula extend behind the postcentral
sulcus, and almost to the hinder end of the posterior limb of the Sylvian
fissure.

Nothing has thus far been said of the relation of the insula to the
basal ganglia. In antero-posterior direction there is no question but that
the insula is limited in close parallelism with the lenticular nucleus, and
consequently that it does not come into any relation with, as has been
suggested, the optic thalamus.