490 
Dr Duckworth, Report on the brain of a 
In section, this part of the brain is seen to be very distinctly 
smaller than normal. The left posterior corpus quadrigeminum 
is smaller than the corresponding part on the right side. In a 
case of congenital absence of the optic nerves, tracts and external 
geniculate bodies, Dr Spiller found no alterations in the anterior 
corpora quadrigemina {Brain, 1901, Yol. 24, p. 632). The right 
crus is here distinctly smaller than the left. The external geni- 
culate body on the right side (that on which the extensive 
occipital haemorrhage has occurred) is practically non-existent 
and the left external geniculate body is abnormally small. 
Fig. 12. Sections through the medulla oblongata in the pyramidal region. The 
microcephalic specimen provided a section traced with a thick line. The finer 
line is from a section of a normal medulla oblongata ( x 2 diam.). 
Fig. 13. Tracings ( x 2) of sections through the decussation of the pyramids. The 
thick line denotes the section of the bulb of the microcephalic subject : the 
fine line is from a normal section. 
Transverse sections were made at two levels, viz. (1) near the 
mid-point of the inferior olivary eminences, and (2) through the 
lower parts of the pyramids just above their decussation. 
The sections are represented in Figs. 12 and 13, and tracings 
of the corresponding outlines of normal sections have been drawn 
in for comparative purposes. 
If the section through the inferior olivary bodies (Fig. 12) 
is examined, this point (of inferiority in sectional area) is the 
first to arrest attention. The position of the dorsal parts of 
the inferior olives is indicated and the “ control ” section shews 
that the reduction in the microcephalic individual is to be 
referred chiefly to the pyramidal portions of the medulla, that 
which lies ventrally to the inferior olives. The lack of symmetry, 
although marked in the mid-brain sections and again in the 
lowest section through the bulb, is here not so striking. 
In the section through the lowest part of the bulb (Fig. 13) 
The hind-brain (Figs. 12 and 13). 
Fig. 12. 
Fig. 13. 
