Peripheral Nervous System
1. Sensory nerve, for example; pain, touch, pressure
2. Motor nerve, for example; activities of muscle
a. Somatic voluntary activities; walking, talking
b. Autonomic involuntary activities; blinking of eyes, cardiac contraction, digestion
1. Sympathetic nervous system
(Initiation of response); vasoconstriction, fall pressure of urinate
2. Parasympathetic nervous system
(Activity of relaxation); Urine out and relax urinary bladder
Peripheral Nervous System consist of -
1. 31 pairs of spinal nerves; present in spinal cord
2. 12 pairs of cranial nerve; present in brain
3. Autonomic nervous system
Spinal nerve
There are 31 pairs of spinal nerves that leave the vertebral canal and they are named according to vertebrae with which they are associated.
1. 8 cervical
2. 12 thoracic
3. 5 lumber
4. 5 sacral
5. 1 coccygeal
Cranial Nerves
12 pairs of cranial nerves are peripheral nerves.
There are 12 pairs of cranial nerves originating from nuclei in inferior surface of brain, some sensory, some motor and some mixed.
They are called cranial as they arise from brain inside cranial cavity.
12 pairs cranial nerve are-
I- Olfactory nerves, sensory
II- Optic nerves, sensory
III- Oculomotor nerves, motor
IV- Trochlear nerves, motor
V- Trigeminal nerves, mixed
VI- Abducens nerves, motor
VII- Facial nerves, mixed
VIII- Vestibulocochlear nerves, sensory
IX- Glossopharyngeal nerves, mixed
X- Vagus nerves, mixed
XI- Accessory nerve, motor
XII- Hypoglossal nerves, motor
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