Freiburger historische Bestände - digital

204

Cunningham Memoirs.

separate in two (figs. 35 and 36), whilst in all the drawings of the chimpanzee
brain at my disposal the union of the two portions of the postcentral
sulcus is depicted. Two hemispheres of the gibbon presented the

Fig. 36.—The cerebral hemispheres of a young female chimpanzee as seen from above. The occipital
operculum on eacb side has been removed. Drawn by the American apparatus for
tracing orthogonal projections of the skull. The brain was adjusted in the apparatus,
so that its occipital end was very much higher than its frontal end, in order that the
parts under cover of the occipital operculum might be introduced into the figure.

r.

. Fissure of Rolando.

p.o.

. . Parieto-occipital fissure.

p> .

. Sulcus postcentralis inferior.

a.n.

. First parieto-occipital annectant gyrus.

p.* .

. Two portions of sulcus postcentralis su¬

<z.

. . Deep annectant gyrus in the course of the



perior.



intraparietal sulcus.

p> .

. Eamus horizontalis.

c.

. . Secondary sulcus in the superior parietal

V> .

. Ramus occipitalis.



lobule.

b. .

. Terminal bifurcation of the intraparietal

a.f.

. . Bottom of the " Affenspalte."



sulcus, i. e. Eeker's sulcus transversus

0.

. . Cut surface of the occipital operculum.



occipitalis.

t.1

. . Parallel sulcus.

same

confluence. Waldeyer informs

US

that in six hemispheres of this

genus he noted the union in four cases, a failure of union in one, and an