EXPLANATION OF FIG. 9.

A medial section through the brain of a child that died at the age of one month. The black and
dotted portions represent areas of medullated fibres. The two dark bands in the visual area repre-
sent medullated fibres radiating from the outer geniculate bodies and conveying impulses from the
The fibres of the tactile area and those passing
macula lutea of the retina, the area of clearest vision.
in the vicinity of the basal ganglia are fairly well medullated. Another section (not given here)
through the same brain shows a large amount of medullation in the spinal cord, medulla, and crura.
The lower quadrigeminal bodies were better medullated than the upper.

c = Caudate nucleus.

=

P=

=

Globus pallidus of the lenticular nucleus.

Putamen of the lenticular nucleus.

T = Optic thalamus.

ci Gyrus cinguli.

=

cm = Corpus mamillare. (Corpus albicaus.)

r = Bundle of white fibres going from the olfactory bulb to the lenticular nucleus, II = Cross-section of the optic tract.

(Page 174a.)

EXPLANATION OF FIG. IO.

A mesial section of the brain of a child that was said to have died at the age of five months. By
comparison with Fig. 9 the large area of dark bands indicates how far medullation has progressed
from the beginning of the second to the end of the fifth month. All portions of the white matter are
medullated, but in every region unmedullated neurites are found.

x-y

Bundle of fibres radiating from the upper and inner part of the frontal tactile area.

This part in Fig. 9 is not medullated.

(Page 174c.)