Functions of Brain Stem Nuclei in Controlling
Subconscious, Stereotyped Movements
Rarely, a baby is born without brain structures above the
mesencephalic region, a condition called anencephaly.
Some of these babies have been kept alive formany months. They are able to
perform some stereo-typed movements for feeding, such as suckling, extru-sion
of unpleasant food from the mouth, and moving the hands to the mouth to suck
the fingers. In addition, they can yawn and stretch. They can cry and can
follow objects with movements of the eyes and head. Also, placing pressure on
the upper anterior parts of their legs causes them to pull to the sitting
position. It is clear that many of the stereotyped motor functions of the human
being are integrated in the brain stem.
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