From here nerves
pass to the thorax and to the fore leg.
4. From the brachial plexus trace out the nerves which pass to different
parts of the fore leg. In doing this separate the muscles with the fingers
and use the knife only where it is necessary to expose the nerves. Note
that some of the branches pass into the muscles, while others connect with
the skin.
5. Remove the skin from the upper portion of one of the hind legs and
separate the muscles carefully until a large nerve is found. This is one
of the divisions of the _sciatic_ nerve. Carefully trace it to the spinal
cord, cutting away the bone where necessary, and find the connections of
its branches with the cord. Then trace it toward the foot, discovering its
branches to different muscles and to the skin.
6. Unjoint the neck and remove the head. Examine the spinal cord where
exposed. Cut away the bone sufficiently to show the connection between the
cord and one of the spinal nerves. On the dorsal root of one of the nerves
find a small ganglion. What is it called?
7. Fasten the head to a small board and remove the scalp. Saw through the
skull bones in several directions. Pry off the small pieces of bones,
exposing the upper surface of the brain. Study its membranes,
convolutions, and divisions.
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