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CHAPTER VI.

ON THE TOPOGEAPHICAL EELATIONS OF THE CEANIUM AND SURFACE OF THE

CEREBEUM.

BY VICTOE HOESLEY, M.B. LOND., F.E.S.

PAGE

Introduction,......306

I. Topography of the Cerebrum viewed as

a 'whole—its Borders, . . . 309
II. Topography of the Cerebrum viewed as

a whole—its Surfaces, . . .314

PAGE

III. Topography of Fissures—

Class I. Those Separating Lobes, . 316
IV. Topography of Furrows—

Class II. Those Subdividing Lobes, . 337
V. Topography of the Island of Eeil, . 353

Introduction.—The anatomical relationship of the various portions
of the encephalon to the enveloping skull, which is commonly spoken of as
eranio-cerebral topography, has of recent years been brought to a certain
pitch of development in consequence of the important part it plays in the
applied sciences of medicine and surgery. It thus happens that in considering
the anatomical questions involved, certain regard has to be paid to
the localization of functions in the various portions of the hemispheres.
The introduction of such matters may seem, in the present case, only necessitated
where the value of some subordinate sulcus would not otherwise be
apparent, but more recent research strongly tends to show that the structure
of the cortex-cerebri is, in so far as it is the basis of differentiated
function, divisible into horizontal segments. These considerations make it
especially desirable that, at this particular stage of progress, some definite
conclusions should be arrived at for the better guidance of future investigation
. Since Broca's original essay in 1861, the work already accomplished
in the subject has given for so-called practical purposes sufficiently accurate