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Responses Of The Nervous System

Peripheral Nervous System (PNS)

PNS includes the nerves, which carry impulses to and from the CNS.

Nerves included in the PNS are of two types- cranial nerves and spinal nerves.

Cranial Nerves

As the name suggests, these nerves originate from the cranium. Man has 12 pairs of cranial nerves, which include all three types of nerves −sensory, motor, and connector. The information about the 12 pairs of cranial nerves is given in the following table:

Number

Name

Nature

Major functions

1.

Olfactory

Sensory

Smell

2.

Optic

Sensory

Sight

3.

Oculomotor

Motor

Movement of eyeball

4.

Trochlear

Motor

Rotation of eyeball

5.

Trigeminal

Mixed

Sensation of touch and taste

6.

Abducens

Motor

Rotation of eyeball

7.

Facial

Mixed

Taste, facial expression, saliva secretion, neck movement

8.

Auditory

Sensory

Hearing, equilibrium

9.

Glosso-pharyngeal

Mixed

Taste, saliva secretion

10.

Vagus

Mixed

Gastric and pancreatic secretion, GI movement, and visceral reflexes

11.

Spinal accessory

Motor

Muscle movemen…

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