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Chapter 4
1. Excessive elation and impaired judgment
2. Insomnia and irritability
3. Hyperactivity
4. Uncontrolled speech
Manic depression, also known as bipolar disorder, displays mood swings between manic and
depression. The limbic system receptors are unregulated. Drugs used are unique mood stabilizers.
The hippocampus is particularly vulnerable to several disease processes, including ischemia, which
is any obstruction of blood flow or oxygen deprivation, Alzheimer’s disease, and epilepsy. These
diseases selectively attack CA1, which effectively cuts through the hippocampal circuit.
A connection between autism and the limbic system has also been noted as well. URL:
http://www.autism.org/limbic.html
The Peripheral Nervous System
The peripheral nervous system includes 12 cranial nerves 31 pairs of spinal nerves. It can be
subdivided into the somatic and autonomic systems. It is a way of communication from the central
nervous system to the rest of the body by nerve impulses that regulate the functions of the human body.
66 | Human Physiology
