Freiburger historische Bestände - digital

290

Cunningham Memoirs.

To my mind the occasional association of a distinct sulcus frontalis
medius in the chimpanzee brain, in all respects similar to the corresponding
furrow in the human cerebrum, with an inferior frontal furrow
(sulcus rectus) altogether distinct from the sulcus fronto-orbitalis, is proof

Fig. 68.—Right cerebral hemisphere of a young chimpanzee (probably about three years old). Drawn
by the American apparatus for tracing orthogonal projections of the skull. The dotted
lines indicate the position of the deep annectant gyri.

r.

. Fissure of Rolando.

/-1 ••

. Sulcus frontalis superior.

p. c. s.

Sulcus prsecentralis superior.

/. m. .

Sulcus frontalis medius.

b.

. Probably the lower part of the sulcus prseIV
.

Sulcus fronto-marginalis of Wernicke.



centralis superior, detached from the

f-2 >

Sulcus frontalis inferior (sulcus rectus).



upper part. If it were joined, the

e. o. .

. Sulcus fronto-orbitalis.



cruciform arrangement of the prse-

s. . .

. Anterior free border of the fronto-parietal



central sulcus and the basal part of



operculum—the so-called anterior limb



the sulcus frontalis superior would be



of the Sylvian fissure of most authors.



exhibited.

S. .

. Exposed part of the insula.

p. c. i. .

Vertical stem of the sulcus prsecentralis

F.1 .

. Gyrus frontalis superior.



inferior.

F? s.

. Upper part of gyrus frontalis medius.

ft. . .

Horizontal ramus of the inferior prsecentral

F.2 i.

. Lower part of gyrus frontalis medius.



furrow.

F.3 .

. Gyrus frontalis inferior.

positive that the sulcus rectus in the apes does not represent the sulcus
frontalis medius in man. I shall now give two drawings obtained from
the right and left cerebral hemispheres of a young female chimpanzee, in
which this condition is well seen.