Motor neuron (None)

Motor neurons are specialized nerve cells that originate in the central nervous system and transmit signals to muscle fibers, enabling voluntary and reflex movements[1][8][9]. There are two main types: upper motor neurons (located in the cerebral cortex, primarily using glutamate as neurotransmitter) and lower motor neurons (located in the brainstem and spinal cord, utilizing acetylcholine, and targeting muscle fibers)[1][8]. Damage to motor neurons leads to characteristic disorders such as paralysis (lower motor neuron damage) or spasticity (upper motor neuron damage). Motor neuron diseases (including ALS and SMA) are characterized by the progressive loss or dysfunction of these cells[7][8]. While crucial for movement and heavily implicated in disease, the term “motor neuron” does not refer to a single canonical molecular target for drug binding—thus, it is not a therapeutic target in the sense of a receptor or enzyme. Motor neuron should not be used as a canonical molecular target for structured drug discovery databases. When a molecular target related to a motor neuron disease is meant (for example, “survival motor neuron protein”/SMN1 in SMA), that specific molecule should be specified[3][7].

Other names

MotoneuronMNefferent neuronlower motor neuronupper motor neuron