Freiburger historische Bestände – digital

282

Cunningham Memoirs.

the hinder branch of its horizontal limb is not so strongly marked as it is
in Cebus, and it lies more in a line with the vertical stem of the sulcus.
The sulcus rectus (/.2) presents the usual form, and the sulcus fronto-
orbitalis has gained in strength and usually turns round the superciliary
margin so as to reach the orbital face of the frontal lobe (e. o.).

The sulcus prascentralis superior is also more distinctly marked, but its
direction is somewhat oblique, and in consequence its identity is obscured
(p. c. s.). In front of this are two transverse furrows which represent the

FtG. 66.—The cerebrum of a Chacma Baboon. Drawn by the American apparatus for tracing orthogonal
projections of the skull. The upper margin is tilted upwards.

r.

. Fissure of Rolando.

P-1 ■

. Sulcus postcentrals inferior.

p. c s.

. Sulcus prsecentralis superior (?).

p.7.

. Sulcus postcentrals superior.

p, c i.

. Sulcus pracentralis inferior.

p.3

. Sulcus horizontalis intraparietalis.

h. .

. Horizontal ramus.

i. p. .

. Inferior transverse furrow of the intra-

e. o. .

. Sulcus fronto-orbitalis.

parietal sulcus.

f-1 ■

, Sulcus frontalis superior.

s. . .

. Fissure of Sylvius.

f. rn.

Sulcus frontalis medius (?).

t.1 .

. Parallel sulcus.

/•2 •

. Sulcus frontalis inferior.

0.

. Anterior lip of the occipital operculum.

i. t. .

. Sulcus transversus inferior of the fissure of
Rolandu.

early condition of a superior frontal sulcus. Three short transverse
furrows placed in front of these, but at a lower level and more directly in
the line of the horizontal limb of the sulcus arcuatus, may represent the
first indication of the sulcus frontalis medius (/. m.).