NSG 3315 Lecture Notes - Lecture 12: Nerve Injury, Hypotonia, Neurodegeneration
Document Summary
Each motor neuron has multiple branches so that it can reach many muscle bers. Upper motor neurons - project to the brain stem and spinal cord and control the lower. Lower motor neurons - controlled by the umn"s and directly affect the muscle bers. Upper motor neurons are in the brain and spinal cord: Upper motor neuron cell bodies are in the motor cortex. They send their axons down through the internal capsule. The axons then run down the white matter of the spinal cord. Lower motor neuron"s axon running through peripheral nerves. Plegia = stroke or paralysis paralysis - loss of movement paresis - weakness mono- = one lim. Wednesday, april 19, 2017 hemi- = both limbs on one side para- = both upper limbs or both lower limbs quadri = all four limbs. Lower - send axons out of the spinal cord, which affect peripheral/spinal nerves and activate muscle bers.
