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  • Nervous System - Get to Know Our Nervous System a Bit Closer

  • Today

  • we will talk about an organ

  • that rules all of our body

  • and that is our brain.

  • As it is the most sensitive organ,

  • our brain is kept inside the bony covering called skull.

  • From doing physical activity

  • to solving logical problems,

  • from dealing with emotions and feelings

  • to creativity,

  • brain is responsible for all.

  • Therefore,

  • it never sleeps.

  • Our brain can be divided

  • into three main parts;

  • the cerebrum,

  • the cerebellum

  • and brain stem.

  • Cerebrum is the largest part of brain,

  • which can be further divided

  • into right and left halves

  • called hemisphere.

  • Each cerebral hemisphere has four lobes

  • namely frontal lobe,

  • parietal lobe,

  • occipital lobe

  • and temporal lobe.

  • Each lobe performs different functions.

  • Cerebellum is responsible

  • for movement and coordination.

  • It gives you sense of balance

  • and thus prevents you from falling down.

  • Brain stem includes mid brain,

  • pons and medulla oblongata.

  • It controls your body's involuntary actions

  • like breathing,

  • heart rate and blood pressure.

  • Brain comes under a system

  • called nervous system.

  • Structurally,

  • nervous system is classified into two types:

  • Central Nervous System (CNS)

  • and Peripheral Nervous System (PNS).

  • The Central Nervous System

  • comprises of the brain and spinal cord.

  • The spinal cord is the bridge

  • that connects the brain

  • to peripheral nervous system.

  • It starts from medulla oblongata

  • and stretches to lumbar region of the spine

  • or vertebral column.

  • The Peripheral Nervous System is a network of nerves

  • spread across our body.

  • Think of Peripheral Nervous System

  • as a network of highway

  • that connects the body

  • with Central Nervous System.

  • This highway has two way traffic.

  • Let's see how.

  • When you hold a hot cup of coffee,

  • sensory neurons in your hand

  • transmit signal to brain

  • through sensory neurons,

  • also called afferent neurons,

  • that the cup is hot.

  • Your brain process that information

  • and send response through motor neurons,

  • known as efferent neurons,

  • that you must put that cup back.

  • PNS consists of total 43 pairs of nerve,

  • among which

  • 12 originate in brain,

  • named as cranial nerves

  • and 31 originate from spinal cord,

  • hence called as spinal nerves.

  • Here you hear the wordneuron”.

  • Neuron is the basic unit of nervous system.

  • It is the nerve cell

  • which transmit electrical signals to brain.

  • A neuron has three parts:

  • Dendrites,

  • soma or cell body,

  • and axon.

  • Dendrites serve as input device for neuron

  • because it receives input

  • from other nerve cells.

  • Soma or cell body of neuron contains nucleus.

  • Axon serve as output device

  • from where it transmit electrical response

  • to other neurons.

  • I hope this helps you

  • in understanding nervous system.

Nervous System - Get to Know Our Nervous System a Bit Closer

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神经系统(Nervous System - Get to know our nervous system a bit closer, how does it works? | Neurology)

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    joey joey 發佈於 2021 年 04 月 24 日
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