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294

Cunningham Memoirs.

frontalis medius. The inferior frontal furrow (sulcus rectus), with its
hinder end placed below the horizontal part of the ramus horizontalis
of the sulcus prsecentralis inferior, is very distinct.

In a drawing which is given by Broca * of the outer surface of the
cerebrum of a gorilla, there is indicated a very distinct sulcus frontalis
medius in conjunction with a sulcus frontalis inferior. The upper part of

Fig. 70.—Left cerebral hemisphere of an orang. Drawn by the American apparatus for
tracing orthogonal projections of the skull.

r. .

Fissure of Eolando.

/. in.

. Sulcus frontalis medius (?).

». t. . <

Inferior transverse furrow of the fissure of

P ,

. Sulcus frontalis inferior.



Eolando (Eberstaller).

e. o. .

. Sulcus fronto-orbitalis.

p. c. i.

Sulcus prsecentralis inferior.

s.

. Anterior free border of the fronto-parietal

h. .

Horizontal ramus of the inferior prsecentral



operculum (the so-called anterior limb



sulcus (?).



of the Sylvian fissure).

p. c. s.

Sulcus prsecentralis superior.

J?. .

. Exposed part of the insula.

f-1 - •

Sulcus frontalis superior.





the vertical stem of the sulcus prsecentralis inferior is bent very much
backwards, so that the horizontal ramus is very nearly vertical in its
direction. The sulcus frontalis inferior communicates behind with the
curved vertical stem of the inferior prsecentral sulcus ; and from this point

* "Etude sur le cerveau chi gorille," Kerne 1'Anthropologic. 2e. serie, t. r., PL 2, fig. 3.