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Dk. Cunningham—Surface Anatomy of the Primate Cerebrum. 83

end of the sixth month. The frontal operculum grows downwards and
backwards, and forms a small wedge-shaped mass with its apex directed
towards the temporal operculum (fig. 25, il, p.). It forms that portion
of the inferior frontal convolution which has been termed by Broca* the
"cap," and by Eberstaller,t Zuckerkandl,t and others, " the pars triangularis
" (PL ii., figs. 17, 19, 20, &c, p.). The orbital operculum grows

in. IV.

Fig. 25.—Diagrams illustrating the manner in which the Insular Region is covered in by the
various opercula. The part printed black represents the uncovered part of the area ;
the light, unshaded portions represent the different opercula. F.P., fronto-parietal
operculum; T„ temporal operculum; F., frontal operculum; 0., orbital operculum
; p.h., posterior horizontal limb of the Sylvian fissure; a. a., anterior
ascending limb ; a.h., anterior horizontal limb.

directly backwards, and in the fully-formed brain comes to lie in great
part under cover of the anterior projecting extremity of the temporal lobe
(PI. i., fig. 33 o.; PI. il, figs. 17, 20, and 24 o.). Towards the end of the

* "Sur la Nomenclature Cerebrate," Bulletin de la Societe d'Anthropologic, 2e Serie,
t. xn., 1877, p. 614.

f Das Stirnliirn. AVien und Leipzig, 1890, p. 105.

J "Ueber den Einfluss des Nahtwachsthumes und der Schadelform auf die Richtung der
Gehirnwindungen," Medizinische Jahrbiicher, 1883, in. and iv. Heft., p. 449.

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