The peripheral nervous system connects all tissues and organs with the central nervous system (Fig. 1.1). Anatomically and functionally, based on their structure, distribution, and organ targets, we can divide the
nerves into two groups.
a. The cerebrospinal nervous system connects the brain and spinal cord to the outside world and its various sensory
impulses. Structures of t he cerebrospinal nervous systems are:

– 12 pairs of cranial nerves (originating in the e n c e p h a l o n ) , which pass from the base of the skull to the head, neck and trunk;
– 31 pairs of spinal nerves (originating in the spinal cord), which pass through the intervertebral foramen, innervating the trunk, legs and arms.

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