Freiburger historische Bestände – digital

PLATE IV.

[The various figures in this Plate were drawn on the stone from Photographs.]
LETTERING COMMON TO FIGURES 1, 8, 9, 10 and 11.

. Sulcus frontalis superior.

p.3 .

. Sulcus horizontalis intraparietalis.

/•2 .

Sulcus frontalis inferior.

i.p. . .

. Inferior transverse furrow of the intraparietal

/. m. .

Sulcus frontalis medius.

sulcus.

e. o. .

. Sulcus fronto-orbitalis.

e. c. . .

. External calcarine fissure.

p. e. .

. Sulcus prsecentralis inferior.

t.1 . .

. Parallel sulcus.

p. C. K.

. Sulcus prajcentralis superior.

t:- . .

. Second temporal sulcus.

p. c. i.

. Sulcus praecentralis inferior.

8.M. .

. Supramarginal gyrus.

r. . .

. Fissure of Rolando.

An. .

. Angular gyrus.

p. . .

. Intraparietal sulcus.

Hl FL? H.z Transverse temporal gyri of Heschl.

P-1 ■

. Sulcus postcentrals inferior.

JR. . .

. Insula.

. Sulcus postcentrals superior.

A.1 . .

. First annectant gyrus (arcus parieto-occipitalis).

LETTERING COMMON TO FIGURES 5, 6 and 7.

r. . .

Upper end of the fissure of Rolando.

C. and C"

The two parts of the posterior secondary calcac
. m. .

Calloso-marginal sulcus.

rine sulcus.

p. c. .

Prase uneus.

cf. • •

Collateral fissure.

p. o. .

. Parieto-occipital fissure.

g.l. . .

Gyrus lingualis.

Oun. .

Cuneus.

c. c. . .

Corpus callosum.

c. .

Gyrus cunei.

ff.f. ■ ■

Gyrus fornicatus.

S. . .

" Stem " of the calcarine fissure.

Figure 1.—The left cerebral hemisphere of a foetus in the latter part of the eighth month of development. The temporal
operculum has been removed so as to expose the insula :—1, sulcus prascentralis insulte ; 2, sulcus centralis insulaj; 3, sulcus
postcentralis insula} ; 0., orbital operculum ; F., frontal operculum (pars triangularis) ; F. P., fronto-parietal operculum.

Figure 2.—The mesial aspect of the hinder end of a right cerebral hemisphere from a lower ape (Cercopithecus). The
inner wall of the posterior horn of the lateral ventricle and the calcar avis have been removed. The deep surface of the outer
wall is therefore exposed, and upon it is seen a vertical elevation corresponding to the " Affenspalte " :—a. s., "Affenspalte " ;
e , eminence on the wall of the ventricle corresponding to it.

Figure 3.—The hinder part of the right cerebral hemisphere taken from a foetus in the latter part of the sixth month of
development. The outer wall of the ventricular cavity has been removed so as to expose the interior:—p. o., elevation corresponding
to the parieto-occipital fissure and the stem of the calcarine fissure ; c. /., collateral fissure; c. e., eminentia
collaterals ; h., hippocampus major.

Figure 4.—Section through the temporal lobe of a seventh month human foetus, to show that the anterior part of the
collateral fissure does not produce a bulging of the ventricular wall:—h., hippocampal fissure ; c. /., fore part of the collateral
fissure ; v., descending horn of the lateral ventricle.

Figure 5.—Mesial surface of the hinder part of a left adult female cerebrum. The parieto-occipital and the calcarine
fissures are widely opened up, so that the interior of each may be studied :—c.1 and c.2, the two parts of the deep gyrus cunei;
C, the fore part of the posterior calcarine sulcus ; C", the hinder part of the posterior calcarine sulcus; a. I., anterior deep
cuneo-lingual gyrus; p. I., posterior deep cuneo-lingual gyrus.

Figures 6 and 7.—The hinder portions of two cerebral hemispheres of a full-time human foetus. The mesial surface of
each is depicted, and they both show, in the arrangement of the parieto-occipital and the calcarine fissures, a condition which
approximates to that seen in the apes. The gyrus cunei (c.) is on the surface, and the " stem" of the calcarine fissure (S.)
runs upwards for some distance into the cuneus, and ends in a bifurcated extremity.

♦Figure 8.—Right cerebral hemisphere of a chacma baboon. The fronto-parietal operculum (F. F. 0.) has been removed
so as to expose the insula:—o., anterior edge of the occipital operculum ; /., inferior frontal furrow.

*Figure 9.—Right cerebral hemisphere of a young female chimpanzee about three years old. The fronto-parietal
operculum (P. F. 0.) has been removed so as to expose the insula :—S.-, the so-called anterior limb of the Sylvian fissure, in
reality the anterior free margin of the fronto-parietal operculum ; 0., the anterior edge of the occipital operculum.

Figure 10.—The right cerebral hemisphere of a chacma baboon viewed from below. The anterior end of the temporal
lobe has been removed :—F. F. 0., lower edge of the fronto-parietal operculum ; 0., the small backward projection, which is
considered by some anatomists to represent an orbital operculum.

*Figure 11.—The right cerebral hemisphere of a male orang-utan about six years old. The fronto-parietal operculum
(P. F. 0.) has been removed so as to expose the insula:—S.2, anterior free border of the fronto-parietal operculum (the
so-called anterior limb of the fissure of Sylvius); 0., anterior edge of the occipital operculum.

* The dotted line represents the position of the anterior border of the parietal bone.

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