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Describe the process of muscle contraction from the neural stimulation to the final movement

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Describe the process of muscle contraction from the neural stimulation to the final movement. "A muscle can only contract when only a nerve ending is stimulated by outgoing impulses from the central nervous system (CNS), which consists of the brain and spinal cord."( The contractile system for muscles is organised into distinct parts, each are controlled by a single motor neurone, and each of the motor neurone controls a large number of muscle fibres. A group of fibres and its neurone is called a motor unit. All the skeletal muscle reacts to an electrical stimulus, which is conducted from the brain to the muscle via nerves. The central nerves system are the brain and spinal cord and the nerves that carry information from the central nerves system to the skeletal muscle are called motor or efferent nerves. ...read more.


Following sensory stimulation a relay neurone transmits neural impulses to the dendrites of the motor neurone; they are specialised to receive electrical impulses and conduct these towards the cell body. Axons are segmented tube-like extensions of a neurone. They arise from the thickened area of the cell body and emerge out of the ventral root of the spinal cord. The function of the axon is to transmit neural impulses away from the cell body towards muscle tissue or a gland. The surrounding myelin sheath acts as an insulator this will speed up the transmission of the impulse. Motor neurone typically divides up into several branches as it reaches the muscle bed. The branches then connect motor neurone to the muscle fibres by distinct structures known as motor end plates. Control by the brain is possible because of the ascending and descending fibres to the motor cortex. ...read more.


Saltatory conduction is the name of this nerve impulse propagation method. Also the thicker the myelin sheaths the faster the nerve impulse that can be conducted. Once the impulse the end of the axon the nerve transmits the information to the muscle by releasing a chemical transmitter called acetylcholine, at the neuromuscular junction. The nerve impulse is when information is relayed from the brain to the muscle via a nerve impulse. A nerve impulse is an electrical current running the length of the nerve, starting at the brain and passing down the spinal column to the relevant cell body. The cell bodies of individual motor neurones are located in various regions of the anterior horn of the spinal column. These cell bodies are referred to as motor neurone pools. The cell bodies are where the muscles are they stimulate for example the circumflex nerve. ...read more.

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