Freiburger historische Bestände - digital

250

Cunningham Memoirs.

2. In 22 per cent, the inferior prsecentral furrow was brought into
connexion with the Sylvian fissure through the intervention of the sulcus
diagonalis.

3. In 20 per cent, the inferior prsecentral sulcus was brought into connexion
with the Sylvian fissure through the intervention of the inferior
transverse furrow of the fissure of Rolando.

Fig. 64.—Right cerebral hemisphere from a foetus in the eighth month of development. Drawn by
the American apparatus for tracing orthogonal projections of the skull. The dotted
connexions between certain of the furrows indicate the position of deep annectant gyri.
The sulcus diagonalis is vertical in its direction, and joins the inferior frontal sulcus.

r.

•

Fissure of Rolando.

f-1 •

. Sulcus frontalis primus.





a.



Sulcus prsecentralis marginalia.

/. m..

. Sulcus frontalis medius.





P-

c. s. .

Sulcus prsecentralis superior.

P ■

. Sulcus frontalis secundus.





h.



Eamus horizontalis of the sulcus prsecent¬



. Anterior ascending limb

of

the Sylvian





ralis inferior.



fissure.





P-

e. i. .

Sulcus prsecentralis inferior.

s.1 .

. Anterior horizontal limb

of

the Sylvian

s.

d. . .

Sulcus diagonalis of Eberstaller.



fissure.





I may further mention that, in one hemisphere (not included in the
above series), there was established a double connexion with the Sylvian
fissure through the intermediation of both the inferior transverse furrow
and the sulcus diagonalis ; in another case both the fissure of Rolando and
the inferior prsecentral furrow joined the inferior transverse furrow, and
presented a common communication with the fissure of Sylvius.