This document discusses the classification and structure of the peripheral nervous system. It is divided into the spinal nerves, cranial nerves, and autonomic nervous system. The spinal nerves consist of 31 pairs that exit the vertebral column through intervertebral foramina. The cranial nerves originate from brain nuclei and include sensory and motor fibers. The autonomic nervous system controls involuntary functions and is divided into the sympathetic and parasympathetic nervous systems.

1. By
Mr. Vinayak R. Bodhankar
M. Pharm. (QA)

2. CONTENTS
 Classification of PNS
 Structure & function of parasympathetic and sympathetic nervous system
 Spinal nerves
 Cranial nerves

3. CLASSIFICATION OF PNS
31 pairs of spinal nerves
12 pairs of cranial nerves
ANS

4. T.S. OF PERIPHERAL NERVE
Endoneurium
Perineurium
Epineurium

5. SPINAL NERVES
 31 pairs.
 Leave from vertebral column.
 Pass through intervertebral foramina by adjacent vertebrae.
 They are named as:
8 cervical
12 thoracic
5 lumbar
5 Sacral
1 coccygeal

6. PLEXUSES
Cervical plexuses
Formed by anterior rami of the first 4 cervical nerves.
Brachial
Formed by anterior rami of the lower 4 cervical nerves.
Lumbar
Formed by anterior rami of the first 3 and part of 4th lumbar nerves.
Sacral
Formed by anterior rami of the lumbosacral trunk & the 1st 2nd and
3rd sacral nerves.
Coccygeal
Formed by a part of the 4th and 5th sacral and coccygeal nerves.

7. CRANIAL NERVES
12 pairs originate from nuclei in the brain.
Some of them are sensory while others are motor in nature.

8. AUTONOMIC NERVOUS SYSTEM
Control involuntary functions of the body.
Initiation of stimulus: in the brain below the cerebrum.
The effect of ANS are essential for :
 Homeostasis
 Stimulation of glandular secretion
 Contraction of cardiac & smooth muscle.
Classification
Sympathetic nervous system
Parasympathetic nervous system