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Alpha (α) motor neurons (also called alpha motoneurons), are large, multipolar lower motor neurons of the brainstem and spinal cord. They innervate extrafusal muscle fibers of skeletal muscle and are directly responsible for initiating their contraction.
Alpha motor neurons, also known as lower motor neurons, are large nerve cells located in the anterior horn gray matter of the spinal cord. They receive direct input from the motor cortex and spinal interneurons, and their axons extend to innervate muscle fibers.
24 lip 2023 · Alpha motor neurons innervate extrafusal muscle fibers and are the primary means of skeletal muscle contraction. The large alpha motor neuron cell body can be either in the brainstem or spinal cord. In the spinal cord, the cell bodies are found in the anterior horn and thus are called anterior horn cells.
27 wrz 2023 · Alpha motor neurons are relatively large motor neurons that innervate skeletal muscle and cause the muscle contractions that generate movement. Specifically, they innervate extrafusal muscle fibers, which are standard muscle fibers.
The alpha motor neuron (AMN) innervates the main fibers that cause muscle contraction. These fibers lie within the muscle and are called extrafusal fibers. Figure 6-6 illustrates the structure of a muscle fiber including the input from the AMN. The axon of each AMN branches to supply the fibers.
Alpha motor neurons (also called lower motor neurons) innervate skeletal muscle and cause the muscle contractions that generate movement. Motor neurons release the neurotransmitter acetylcholine at a synapse called the neuromuscular junction.
Individual alpha motor neurons control the force exerted by a particular muscle, and spinal circuits can control sophisticated and complex behaviors such as walking and reflex actions. The types of movements controlled by these circuits are not initiated consciously, however.
