what type of neuron initiates physical movement and allows people to move through the world?
The brain is key to our existence, merely there's a long mode to get before neuroscience tin truly capture its staggering capacity. For now though, our Brain Command serial explores what we do know about the brain'due south command of 6 key functions: language, mood, retention, vision, personality and motor skills – and what happens when things go incorrect.
Having voluntary control over body movements is the only style we tin interact with people, objects and our environment. Trunk movement is not just about controlling arms and legs; it'due south too for our head and eyes to visually explore the world, for our facial expressions to testify emotion, and for articulation of our lips, tongue and mouth to communicate.
Further reading: What brain regions command our linguistic communication? And how do we know this?
The devastating effects of the brain losing its power to command torso movements are seen in motor neuron illness – where progressive degeneration and muscle wasting leads to some patients condign "locked-in", meaning they tin't move or communicate in any way.
The motor system and principal motor cortex
The encephalon's motor system is contained mostly in the frontal lobes. It starts with premotor areas, for planning and coordinating complex movements, and ends with the primary motor cortex, where the final output is sent down the spinal string to cause contraction and movement of specific muscles.
The primary motor cortex on the left side of the encephalon controls movement of the right side of the body, and vice-versa, the right motor cortex controls movement of the left side of the torso.
Different areas of the main motor cortex connect to, and command, movement of different parts of the torso, forming a kind of torso map known as the homunculus.
The size of the expanse on the homunculus determines the level of fine movement control we have with that function of the body. So, for instance, a big proportion of the motor cortex is devoted to our thumb, fingers, mouth and lips, as they are vital for manipulating objects and speech articulation.
The connexion from the primary motor cortex to muscles of the body is so of import that whatever damage leads to an impaired ability to move. If someone suffers a stroke, for case, that causes harm to the principal motor cortex on one side of their brain, they will develop an impaired ability to move on the opposite side of their body.
Further reading: Some people tin can't run across, but still retrieve they tin: here's how the brain controls our vision.
If the area of impairment is specific to only office of the primary motor cortex, such as the hand area of the homunculus, it volition affect movements simply of the corresponding part of their body, for example, the paw.
Neuroplasticity and movement rehabilitation
As with other parts of the brain, when neurons of the primary motor cortex are damaged they volition never regrow or repair. However, the brain can heal itself and regain some lost function through neuroplasticity. This means undamaged parts can alter their connections and remap to other areas of the trunk to take over part, compensating for damaged parts of the motor cortex.
Neuroplasticity is the fundamental principle in physical rehabilitation, such as physiotherapy for patients following stroke, that allows patients to regain motor role and recover. Through neuroplasticity, the more a particular movement is performed, the stronger the encephalon pathways for that movement become and the easier it gets to perform that movement in the future.
Allow'south look at an example of a stroke patient, Harry, who has problems with move in his left leg. Harry might accept altered patterns of walking due to damage in the leg area of the motor cortex of the right side of his encephalon. To help Harry regain efficient walking power, the physiotherapist helps him perform sequences or patterns of walking by practising activation and control of specific muscle groups in his left leg.
Further reading: We're capable of infinite retentiveness, but where in the brain is it stored, and what parts aid recall it?
At first, Harry will demand lots of concentration to utilize the correct muscles as his brain is laying downwards new neural pathways to compensate for the damaged areas. Only as this practise is repeated and the new pathways are established and strengthened, right movement becomes easier without much concentration.
This same principle of neuroplasticity besides applies for learning in the good for you brain. Anytime we learn a new skill such as learning to ride a bike, writing our signature or dancing the tango, it's our encephalon's ability to strengthen or brand new connections to adjust and change that allows the states to learn.
So if yous are a ballet dancer or a gymnast, a swimmer or a soccer player, a sentry-maker or micro-surgeon, your brain connections in your motor system will be different depending on the practice and skill you have with fine movement of different parts of your trunk.
This article was co-written with Zita Arends, who is a physiotherapist in stroke rehabilitation and aged care.
Read other articles in our Brain Control serial, here.
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Source: https://theconversation.com/how-our-brain-controls-movement-and-makes-new-connections-when-parts-are-damaged-63520
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