1907.| Different Arteries supplying the Human Brain. 27 
The centrum ovale by the anterior, middle, and posterior cerebral arteries. 
The simultaneous injection of the five arteries supplying the brain, by the 
same pressure, with soluble colours in gelatine has (it is believed) not been 
accomplished before, and it is considered that this method gives the most 
accurate representation of the distribution of each artery, including that of 
the finest capillaries. 
The parts of the brain, the arterial supply of which hitherto has not been 
described, or which are found to be different from other observers, are :— 
The regio subthalamica, with the corpus subthalamicum and Forel’s field, 
the supply to which has not been described; the relative supply of the 
arteries to the pes pedunculi; the corpus mammillare (by the posterior 
cerebral in place of the posterior communicating); the exact supply to 
the anterior limb of the internal capsule; the absence of anastomoses of 
the three arteries supplying the posterior limb of the internal capsule; the 
exact supply to the caudate nucleus; the absence of anastomosis in the 
head of the caudate nucleus between the anterior and posterior cerebral 
arteries; the exact supply of the lenticular nucleus; the supply to the 
different nuclei of the optic thalamus, which has not been described before 
(the thalamus is not supplied by the lenticulo-optic arteries of Duret); the 
anterior part of the choroid membrane, which is supplied by the anterior 
choroid artery ; the supply to the fornix and the anterior commissure. 
In the cortex the observations differ from those of Duret in that, though 
there are great varieties, the anterior cerebral area extends most frequently 
on the outer surface along the median line posteriorly to midway between 
the Rolandic fissure and the external parieto-occipital fissure, instead of 
to the Rolandic fissure ; and inferiorly to the sulcus frontalis superior, 
instead of the sulcus frontalis inferior. The middle cerebral area on the 
outer surface reaches the middle line for the posterior half of the parietal 
lobe, in place of along the whole extent of the lobe; and posteriorly the 
posterior pole, or half an inch in front of it, in place of the upturned end of 
the parallel sulcus; and inferiorly the middle of the third temporal gyrus in 
place of the middle of the second temporal gyrus; this diminution of the 
extent of the posterior cerebral area on to the outer surface corresponds to 
the increase of the middle cerebral area. 
In the supply to the pedunculus cunei and the optic radiations the results 
agree with Henschen rather than with Monakow, though they differ from both 
in the case of the supply to the optic radiations ; the supply to the fasciculus 
longitudinalis inferior is different to that given by Monakow, and corresponds 
to that of the optic radiations. 
The exact arterial supply to the corpus callosum, uncus and cornu ammonis 
