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292

Cunningham Memoirs.

The sulcus frontalis inferior (sulcus rectus) (f.2) extends forwards above
the upper end of the sulcus fronto-orbitalis (e.o.). It pursues a straight
course, and shows no tendency to bend in a downward direction towards
its anterior end. In short, it is directed towards the frontal pole. Its
hinder end is joined to the vertical stem of the inferior praecentral sulcus,
but the communication is interrupted by the presence of a distinct deep
gyrus.

Fig. 69.—Left hemisphere of a young female chimpanzee, probably about three years old. Drawn by
the apparatus for tracing orthogonal projections of the skull. The dotted lines indicate
the deep annectant gyri.

r. . .

Fissure of Eolando.

e. o. .

. Sulcus fronto-orbitalis.

p. c. s. .

Sulcus prsecentralis superior.

f-1 •

. Sulcus frontalis superior.

b. . .

Lower limb of sulcus praecentralis superior (?).

/. m.

. Sulcus frontalis medius.

p. c. i. .

Sulcus prsecentralis inferior.

/•2 •

. Sulcus frontalis inferior.

h. . .

Ramus horizontalis.

F.1 .

. Gyrus frontalis superior.

s. . .

Anterior free border of the fronto-parietal

F.2 s.

. Superior part of gyrus superior medius.



operculum — the so-called anterior

F.2 i.

. Inferior part of gyrus superior medius.



Sylvian limb.

F* .

. Gyrus frontalis inferior.

B. . .

Exposed part of the insula.





In the left hemisphere (fig. 69) the arrangement of the furrows is not
so distinct, seeing that several of them have entered into abnormal connexions
with their neighbours • still with the right hemisphere as a guide
the interpretation of the conditions present is not difficult.