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Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 97

as a barrier between the lower end of the furrow which limits the island of
Eeil in front and the vallecula Sylvii. Sometimes, however, it is depressed
and deep, and then a superficial connexion occurs between the anterior
limiting furrow of the insula and the vallecula.

■-S.R3

Fig. 27.—Eberstaller's figure illustrative of the fissures and gyri on the surface of the human insula.
(From the Anatomischer Anzeiger, No. 24, 1887, with permission.)

1.

Gyrus brevis primus,

Insula

T%. •

. Middle temporal convolution.

2. .

. Gyrus brevis secundus,

x.y. .

. Transverse convolutions of Heschl.

3.

Gyrus centralis anterior,

anterior.

s.i. .

. Sulcus centralis insulse.

4.

. Gyrus centralis posterior,

Insula

s.a. .

Sulcus prsecentralis.

5. .

. Gyrus posterior secundus,

posterior.

g.tr.i.

. Gyrus transversus, which is represented as

S.R.a.

Sulcus Reillii anterior.





passing into the inner end of the orbital

S.E.t.

Sulcus Reillii superior.





operculum (a).

S.K.p.

Sulcus Reillii posterior.



c. .

. The transverse furrow on the deep surface

L. .

. Limcn insulce.





of the temporal pole, with which, in the

P. .

. Pole of the insula.





adult, the posterior or inferior limiting

F. .

. Orbital part of the inferior frontal convolusulcus
of the insula, becomes contion
.





tinuous.

T. .

. Pole of the temporal lobe.



m.

Gyri on the upper surface of the temporal

Tu .

. Superior temporal convolution.



pole.

The gyrus accessorius is placed to the outer side of the gyrus transversus
. It stretches forwards from the fore-part of the gyrus brevis primus,
and lies under cover of the orbital operculum at a lower level than the
anterior horizontal limb of the Sylvian fissure. As Eberstaller has pointed

ROYAL IRISH ACADEMY.—OUNKINGHAII MEMOIRS, NO. VII. [13]