Freiburger historische Bestände - digital

334

Cunningham Memoirs.

Poirier, after determining in the adult, by absolute measurement, the
usual position of the lower end of the fissure, states that a relative method
of value is the following:—After having measured the distance from the
prse-auricular fossa to the sagittal line, the relative distance of the lower
end of the Rolandic fissure from the auditory canal is to the total auriculo-
sagittal length as 7 to 17. He came to this conclusion after having
examined, in various ways, no less than 94 heads.

Fer£, taking the length of the hemisphere with callipers, states that the
distance from the frontal pole to the lower end of the fissure of Rolando, is
44 per cent, of the whole length.

(b) Absolute Measurements.—Employing, as in the case of the upper end
of the fissure, absolute measurements to confirm the conclusions arrived at
respecting the lower end, I find that the following such data have been
recorded:—

Observer.

No. of Cases
Examined.

Distance of .Rolando, lower end, from Coronal Suture.

Broca, ....



11 (males).



2-3 cm.

Hefftler,



20



2-8 cm.
2-8.*

Giacomini,







' Brachyceph. case, 2-008.
. Dolichoceph. case, 2-65.

Lucas Championniere,





-

f A horizontal line is drawn from the external
angular process of the frontal for
7 cm. Prom the posterior extremity of
this line a vertical is raised 3 cm. high.
The upper end of this should correspond
with the lower end of the fissure of

^ Rolando.

Poirier,



large number.



2-8 cm.

The Topography of the Sinuosities of the Rolandic Fissure.—Of the
sinuosities that have been described to occur in the fissure of Rolando,
and said by Passet to be more marked in the male than female, two alone

* Prom the context it does not appear whether Giacomini, in making this statement, is quoting
from his own observations or from Hefftier's.