NEUR 1203 Lecture Notes - Lecture 8: Lower Motor Neuron, Motor Neuron Disease, Ice Bucket Challenge
24 Jun 2020
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Cns: can divide umns into different groups based on how far they travel to synapse onto. Lmns (just to brainstem, or all the way to sc) Lower motor neurons: lmns have their cell bodies (soma) in the brainstem or spinal cord, but axons leave the. Cns and synapse onto muscles: they receive signals from umns, and bring messages to the muscles to contract, lmns can pass through either spinal or cranial nerves. Lmns passing through spinal nerves primarily control muscles of the limbs and trunk. Lmns passing through cranial nerves primarily control muscles of the head and neck: motor neuron tracts, umns that originate in the motor cortex have axons that travel through the brain to two locations: Intellectual function retained: als: symptoms, weakness in the arms or legs typically occurs first. Loss of arm function usually occurs first with sporadic forms of als.
