Alpha motor neuron

The corticospinal tract is one of the major descending pathways from the brain to the α-MNs of the spinal cord.

Alpha motor neurons are located in lamina IX according to the Rexed lamina system.

Poliomyelitis, caused by the poliovirus seen here, is associated with the selective loss of cells within the ventral horn of the spinal cord, where α-MNs are located.

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 are distinct from gamma motor neurons, which innervate intrafusal muscle fibers of muscle spindles.

单词	Alpha system
释义	Alpha system 英语百科 Alpha motor neuron 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 are distinct from gamma motor neurons, which innervate intrafusal muscle fibers of muscle spindles.
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Alpha system

Alpha motor neuron