Question

Discuss the major functions of the components of the central nervous system.

Answer 1

The central nervous system made up of two parts :-

01 The brain

02:- The spinal cord

image below for understanding then we discussed the function

Function of

The brain:-

01 Brain most complex organ needs 20% of whole oxygen in body

02 Brain consist approx 100 billion of neurons

03 Brain mainly divide in four parts :-

(a) :- Temporal lobes :- helps in auditory , memory , emotions

(b) occipital lobes :- helps in vision , colour determination, depth perception , face recognition,and memory formations

c) parietal lobes :- work on sensory and perception intigrating sensory input ( touch , pressure, heat , cold , pain ) stimuli present

d) frontal lobe :- motor action movement , refinement of pyramidal pathways , cognitive and emotional processing.

The spinal cord :-

• Connects large part of peripheral nervous system to brain
• Nerve impulse reaches through spinal cord to the brain (sensory neuron )
• Provide structure support helps to make posture
• Mylien peresent in white matter for electric insulation
• communicate message from brain to other body parts
• coordinate in refulxes

spinal cord vertebrae:-

Cervical :-7 ,thoracic :- 12 , Lumbar :- 5 , sacrum :- 05ccoygeal :-01

spinal nerve :- Cervical :-8 , thoracic :-12 , lumbar :-05, sacrum:- 05 ccoygeal:-02

total :-31 pairs

Spinal nerve functions:-

Cervical :-

C1 -C3 - neck muscles movement

C4 - Diaphragm muscles

C5:- deltoid muscles

C6 :- wrist movements

C7 :- triceps muscles movement

C8 :- fingers muscles movement

Thoracic nerve :-

T1 :- Hand mobility

T2- T12 :- intercostal muscles

T7 - L1 :- Abdominal muscles

T12-L2 :- ejaculation

Lumbar :-
L2 :- hips movement

L3 :- quadriceps muscles

L4-L5:- hamstring muscles

L4 - S1 :- Foot movement

Sacrum:-

S2-S3:- penile erction, Bowel and bladder muscles movement .

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