microcephalic idiot with bilateral porencephaly. 483 
compounded of two sulci which diverge as they approach the 
margin of the operculum. Of these two, the posterior is the 
lower part of the central sulcus and the anterior seems to represent 
the inferior precentral sulcus. 
Between the upper and lower central sulci, others are seen (as 
already described) in the long axis of the hemisphere. Of these, 
the uppermost may be regarded as a combination of the upper 
postcentral and precentral elements with part of the superior 
frontal sulcus. The latter is further represented by two detached 
sulci situated further forwards and between these and the upper 
cerebral margin are dimples representing a marginal frontal 
sulcus. 
A middle precentral sulcus and three detached portions of the 
middle frontal sulcus are identified and to the latter, two more 
small sulci (representing Wernicke’s sulcus fronto-marginalis) 
are accessory. 
The sulcus frontalis inferior seems to be replaced by two 
detached sulci and below the more anterior of these another 
fronto-marginal sulcus (Eberstaller’s) may be seen. The orbital 
sulci require no special description. 
In the parietal region the disturbance brought about by the 
haemorrhagic effusion has much complicated the arrangement 
of sulci. The sulcus intraparietalis is replaced by several in- 
dependent sulci as represented in Fig. 1. Finally other sulci 
can be respectively identified with the sulcus occipitalis superior 
and the sulcus occipitalis lunatus. 
Temporal region. 
This is the most remarkable part of the cortex : from the 
Sylvian fissure right round to the hippocampal fissure on the 
mesial aspect, no true sulcus is found. Immediately below the 
Sylvian fissure are four or five slight furrows, the direction of 
which is nearly parallel to the first-named fissure but they are 
the merest wrinkles on the cortical surface. The cortex itself 
is attenuated and the lateral ventricle seems to have been much 
dilated owing to blood having been effused into its cavity. 
The mesial aspect. 
This aspect presents some very noteworthy features. 
I. (a) The commissures. It is uncertain whether the anterior 
commissure was present. It is certainly not large or prominent, 
but as in the process of injecting the brain this region lias been 
much disturbed, the anterior commissure may possibly have been 
destroyed. 
VOL. XIV. FT. V. 
32 
