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PART IX:
GW26
HORIZONT AL
PART IX:
GW26
HORIZONT AL
This specimen is case number W-16-59 (Perinatal RPSL) in the
Yakovlev Collection, a premature stillborn female infant. The brain is
classified as a Normative Control in the Yakovlev Collection (Haleem,
1990). It was cut in the horizontal plane in 35-μm and 15-μm thick sec-
tions. Since there is no available photograph of this brain before it was
embedded and cut, the photograph of the lateral view of another GW26
brain that Larroche published in 1967 (Figure 12) is similar to the fea-
tures of the brain in Y16-59.
The approximate cutting plane of this brain is indicated in Figure 13
(facing page) with lines superimposed on the GW26 brain from the Lar-
roche (1967) series. The anterior part of each section (on the left) is
dorsal to the posterior part (on the right). As in all other specimens,
the sections chosen for illustration are more closely spaced to show
small structures in the diencephalon, midbrain, pons, and medulla. Illus-
trated sections are spaced farther apart when they contain only large
brain structures, such as the cerebral cortex, basal ganglia, and cerebel-
lum. Photographs of 17 different Nissl-stained sections (Levels 1-17)
are shown at low magnification in Plates 216-229. The core of the brain
and the cerebellum are shown at high magnification in companion Plates
230AB-244AB for Levels 3-17.
Figure 12. Lateral view of a GW26 brain with major structures in the cerebral hemispheres labeled. (From the
photographic series of: J. C. Larroche (1967) Maturation morphologique du système nerveux central: ses rap-
ports avec le développement pondéral du foetus et son age gestationnel. In: Regional Development of the Brain
in Early Life, A. Minkowski (ed.), London: Blackwell, page 254.)