Answer Happy

Fill in the blanks with the terms provided. Not all terms will be used. descending receptors posterior upper effectors anterior lower interneurons Motor pathways are descending pathways in the brain and spinal cord that control effectors. At least two motor neurons are present in the motor pathway: an upper motor neuron and a lower motor neuron. The cell body of an upper motor neuron is housed either within the cerebral cortex or a nucleus within the brain stem. Axons of these synapse either directly on lower motor neurons, or on interneurons. The cell body of a lower motor neuron is housed either within the anterior horn of the spinal cord or within a brainstem cranial nerve nucleus. Axons of the lower motor neurons exit the CNS and project to their specific effector cells.