485 
microcephalic idiot with bilateral \ porencephaly. 
anterior continued into an inferior precentral sulcus ; and a 
posterior subcentral sulcus runs upwards from the posterior limb 
of the Sylvian fissure. 
The central sulcus is present, but apparently very far from the 
anterior end of the hemisphere. The lack of development of the 
parietal and occipital lobes perhaps accounts for this appearance. 
The sulcus passes on to the mesial aspect of the hemisphere above. 
Fig. 6. The lateral aspect of the left hemisphere 
of the microcephalic brain ( x V). 
The frontal lobe bears all the sulci usually present. The 
sulcus with radiating branches which is identified with part ot 
the inferior frontal sulcus is a striking feature and produces a 
resemblance to the appearances of the corresponding region in 
the brain of Simia (Orang-utan). 
32—2 
