dopetalk does not endorse any advertised product nor does it accept any liability for it's use or misuse

This website has run out of funding so feel free to contribute if you can afford it (see footer)

Author Topic: [HowStuffWorks] How Your Brain Works: the Neuron  (Read 6187 times)

Offline Chip (OP)

  • Server Admin
  • Hero Member
  • *****
  • Administrator
  • *****
  • Join Date: Dec 2014
  • Location: Australia
  • Posts: 6663
  • Reputation Power: 0
  • Chip has hidden their reputation power
  • Gender: Male
  • Last Login:Today at 06:17:38 AM
  • Deeply Confused Learner
  • Profession: IT Engineer
[HowStuffWorks] How Your Brain Works: the Neuron
« on: June 14, 2019, 03:52:35 PM »
this source: https://science.howstuffworks.com/life/inside-the-mind/human-brain/brain1.htm

primary source: https://science.howstuffworks.com/life/inside-the-mind/human-brain/brain.htm

Neuron Structure


 
The basic design of a neuron

Your brain is made of approximately 100 billion nerve cells, called neurons. Neurons have the amazing ability to gather and transmit electrochemical signals -- think of them like the gates and wires in a computer.

Neurons share the same characteristics and have the same makeup as other cells, but the electrochemical aspect lets them transmit signals over long distances (up to several feet or a few meters) and send messages to each other.
 
Neurons have three basic parts:

1. Cell body or soma. This main part has all of the necessary components of the cell, such as the nucleus (which contains DNA), endoplasmic reticulum and ribosomes (for building proteins) and mitochondria (for making energy). If the cell body dies, the neuron dies.

2. Axon. This long, cablelike projection of the cell carries the electrochemical message (nerve impulse or action potential) along the length of the cell. Depending upon the type of neuron, axons can be covered with a thin layer of myelin sheath, like an insulated electrical wire. Myelin is made of fat and protein, and it helps to speed transmission of a nerve impulse down a long axon. Myelinated neurons are typically found in the peripheral nerves (sensory and motor neurons), while non-myelinated neurons are found in the brain and spinal cord.

3. Dendrites or nerve endings. These small, branchlike projections of the cell make connections to other cells and allow the neuron to talk with other cells or perceive the environment. Dendrites can be located on one or both ends of a cell.

the NeuronWiki



Neurons come in many sizes. For example, a single sensory neuron from your fingertip has an axon that extends the length of your arm, while neurons within the brain may extend only a few millimeters.

They also have different shapes depending on their functions. Motor neurons that control muscle contractions have a cell body on one end, a long axon in the middle and dendrites on the other end. Sensory neurons have dendrites on both ends, connected by a long axon with a cell body in the middle. Interneurons, or associative neurons, carry information between motor and sensory neurons.
 
These fundamental members of the nervous system also vary with respect to their functions.

Sensory neurons carry signals from the outer parts of your body (periphery) into the central nervous system.
Motor neurons (motoneurons) carry signals from the central nervous system to the outer parts (muscles, skin, glands) of your body.

Interneurons connect various neurons within the brain and spinal cord.

The simplest type of neural pathway is a monosynaptic (single connection) reflex pathway, like the knee-jerk reflex. When the doctor taps the right spot on your knee with a rubber hammer, receptors send a signal into the spinal cord through a sensory neuron. The sensory neuron passes the message to a motor neuron that controls your leg muscles. Nerve impulses travel down the motor neuron and stimulate the appropriate leg muscle to contract.

The response is a muscular jerk that happens quickly and does not involve your brain. Humans have lots of hardwired reflexes like this, but as tasks become more complex, the pathway circuitry gets more complicated and the brain gets involved.
« Last Edit: June 14, 2019, 03:59:58 PM by Chip »
friendly
0
funny
0
informative
0
agree
0
disagree
0
like
0
dislike
0
No reactions
No reactions
No reactions
No reactions
No reactions
No reactions
No reactions
Our Discord Server invitation link is https://discord.gg/jB2qmRrxyD

Tags:
 

Related Topics

  Subject / Started by Replies Last post
1 Replies
834 Views
Last post April 14, 2015, 07:57:24 AM
by smfadmin
6 Replies
14386 Views
Last post July 03, 2016, 10:10:42 PM
by Chip
1 Replies
5454 Views
Last post April 06, 2017, 01:53:29 AM
by bignasty
3 Replies
9982 Views
Last post September 22, 2018, 07:53:56 AM
by Chip
0 Replies
6705 Views
Last post June 14, 2019, 04:06:52 PM
by Chip
0 Replies
6487 Views
Last post June 14, 2019, 04:39:29 PM
by Chip
0 Replies
5781 Views
Last post July 22, 2019, 03:54:57 PM
by Chip
0 Replies
7942 Views
Last post October 20, 2019, 03:36:28 PM
by Chip
0 Replies
6672 Views
Last post January 12, 2024, 04:27:51 PM
by Chip
0 Replies
143 Views
Last post October 04, 2024, 04:48:44 AM
by Chip


dopetalk does not endorse any advertised product nor does it accept any liability for it's use or misuse





TERMS AND CONDITIONS

In no event will d&u or any person involved in creating, producing, or distributing site information be liable for any direct, indirect, incidental, punitive, special or consequential damages arising out of the use of or inability to use d&u. You agree to indemnify and hold harmless d&u, its domain founders, sponsors, maintainers, server administrators, volunteers and contributors from and against all liability, claims, damages, costs and expenses, including legal fees, that arise directly or indirectly from the use of any part of the d&u site.


TO USE THIS WEBSITE YOU MUST AGREE TO THE TERMS AND CONDITIONS ABOVE


Founded December 2014
SimplePortal 2.3.6 © 2008-2014, SimplePortal