Freiburger historische Bestände - digital

166

Cunningham Memoirs.

chimpanzee and orang. I refer to the presence of a deep annectant gyrus
in the lower part of the fissure of Rolando, indicating, no doubt, the
junction of the latter with an additional lower element, and also of a short,
oblique, and independent furrow below and in front of the lower extremity
of the fissure of Rolando, and in relation to the margin of the frontoparietal
operculum.

Fig. 33.— Lateral view of the left hemisphere of a Chacnia baboon, the mesial border of the hemisphere
having been raised considerably. Drawn by the American apparatus* for tracing
orthogonal projections of the skull.

r.

Fissure of Kolando.

/. m.

Sulcus frontalis medius (P)

i. t. . .

Two inferior transverse furrows of the

/•2 •

Sulcus frontalis inferior.



fissure of Eolando.

e. o. .

. Sulcus fronto-orbitalis.

p. C. s. .

Sulcus prsecentralis superior, with basal

s.

. Sylvian fissure



part of the superior frontal sulcus.

p} .

. Sulcus postcentrals inferior.

p. c. i. .

Sulcus prsecentralis inferior.

p.2 .

. Sulcus postcentralis superior.

h. . .

Ramus horizontalis of sulcus prsecentralis

p.3 .

Ramus horizontalis parietalis.



inferior.

t.1 .

. Parallel sulcus.

P • •

Sulcus frontalis superior.

0.

. Anterior lip of the occipital operculum.

Between its two extremities the fissure of Rolando pursues a sinuous
course. Very seldom in the adult brain is it quite straight. As Eberstaller
and others have shown, two of the bends, termed respectively the superior
and inferior genua, are more conspicuous than the others. In typical cases
these are placed at an equal distance from each other and from the two

* For a description and drawing of this most useful apparatus, see the article by Dr. W.
Matthews, in the Journal of Anatomy, xxi., p. 43.