]
Muscles and groups of muscles on the two sides of the body which invariably
act together may thus be innervated from either hemisphere, e.g. the
muscles of the larynx, the trunk, and upper part of the face.
Gall, the founder of the doctrine of Phrenology, wrecked his fame as a
scientist by associating mental faculties with conditions of the skull
instead of conditions of the brain beneath; nevertheless, he deserves the
highest credit for his discoveries and deductions, for he was the first to
point out that that part of the brain with which psychic processes are
connected must be the cerebral hemispheres. He said, if we compare man with
animals we find that the sensory functions of animals are much finer and
more highly developed than in man; in man, on the other hand, we find
intelligence much more highly developed than in animals. Upon comparing the
corresponding anatomical conditions, we see, he said, that in animals the
deeper situated parts of the brain are relatively more developed and the
hemispheres less developed than in man; in man, the hemispheres so surpass
in development those of animals that we can find no analogy. Gall therefore
argued that we must consider the cerebral hemispheres to be the seat of the
higher functions of the mind.
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