Application Assignment

A STUDY OF ANATOMY AND PHYSIOLOGY OF MOVEMENT OF LOWER offset AND THE UPPER LIMBThe procedure in lifting the leg to climb a stair is a complex one which involves a great amount of technology inter-transfer between the capitulum and the eventual skeletal muscle . There is initiation of the movement at the brain which is transmitted via specialized white fibre packages to the hip flexors via the middling spinal cord , involving a very complex machine at the cellular levelThe initiation of the process is at the view cortex (Ms I ) of the brain . The primary motor land is located at the precentral gyrus of the frontal lobe . The area authoritative the motion of the lower limbs lies towards the superior surface of the brain . within this area lies the cell body of the primary nerve cell . These nerve cells are known as upper motor neurons (UMN . These UMNs receive modulating pulse rate from the inputs from the cerebellum and the basal ganglia via the extrapyramidal pathways . These tracts modulate the gross movement initiated at the frontal cortex . In turn these areas are modulated by afferent signals from ascending spino cerebellar , and spino-thalamic pathways . The complex the signal initiated at the nucleus of the cell body is transmitted electronic exclusivelyy via the axon of the myelinated neuron via the mode of salutatory conduction . The myelin event which surrounds the axon of nerves that involve fast transport , breaks at intermediate component parts known as Nodes of Ranvier . The electrical impulse moves in a jumping manner at these nodes nerve contagious disease as a neural impulse generated by the organization of a nerve action potential . Like all excitable tissue , nerves maintain a resting membrane potential that is the conflict of voltage across the membrane of the neuron . In neurons this value is - 70 mV . This voltage difference is maintained by the Na /K pump on the membranes .

This impulse generated at the axon hillock is transmitted via the depolarizing sort which allows sodium ions ingress into cells via opening of the Na channels . This ingress of Na in one portion allows activation of other(a) Na channels , causing depolarization of the adjacent region of the neuron . Subsequently repolarization occurs via the opening of K channels , which restores the membrane potential . Thus this process continues which allows the transmission of impulse . numerous such nerves together descend as the move cortico spinal tract in the pyramidal system , which travels finished the mesencephalon into the spinal cord , decussating at the level of midbrain ( 90 of the fibres decussating and forming the lateral spinothalamic tract ) and again at the level of spinal cord ( the other 10 , forming the anterior spinothalamic tract . It is the former which is responsible for the lower limb movements . The cortico-spinal tract travels in the anterior horn cell of the spinal cord trough the lumbar level where they synapse with the spinal ventral root neuron (lower motor neuron . A single post-synaptic neuron receives signals from umpteen neurons . At the axon terminal , the propagation of impulses leads to release...If you want to get a full essay, order it on our website: Orderessay

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