and the first two fingers of the right hand put beneath the two
cerebellar lobes so that the medulla and portions of cervical cord
fall between these fingers, which are then used to lift them upward
and backward. The freed brain is now rolled over backward out of the
cranial cavity upside down onto the palm of the left hand, and is
then placed upon a board, tray or dish ready for examination. If the
cord has already been removed, any portion remaining is taken out
with the brain. In case the cord has been freed and is to be removed
with the brain it is only necessary to cut the vertebral arteries and
then to lift up the brain, drawing the cord up through the foramen
magnum.
3. =Section of the Brain.= (_Modified Virchow Method._) The brain as
it is taken from the cranium is placed upside down, with occipital
lobes toward the prosector. The basal meninges and blood-vessels
are then carefully examined. The hemispheres and convolutions are
separated and the arachnoid torn by the tip of the index-finger or
the handle of a scalpel; and the branches of the cerebral vessels
to their deepest ramifications are thus exposed, giving a complete
picture of the circle of Willis and all of its branches to the point
where they enter the brain-substance. The larger vessels are opened
by transverse or longitudinal cuts and their walls and contents
noted. The brain is then turned over, and the meninges examined over
the entire convexity. The pia and arachnoid are then removed together
over the entire convex and median surfaces of the hemispheres. If
the blood-vessels between the convolutions are seized with the
forceps the meninges can be easily stripped off, the fingers aiding
the forceps, using great care not to tear the brain substance. The
meninges are removed about half-way down the outer sides of the
hemispheres and are there left intact so as to hold the pieces of
brain together after it has been cut, and so permit orientation. The
cortical surface is then examined; if bloody, it should be washed
with a weak stream of water.
[Illustration: FIG. 28.—Method of examination of brain. Opening of
left ventricle. Line showing direction of cuts. (After Nauwerck.)]
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