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corticospinal tract

a major motor pathway that originates in the cerebral cortex (see motor cortex), passes through the pyramid of the medulla oblongata, and descends to terminate in the spinal cord. At the pyramid, most of its fibers cross over to form the lateral corticospinal tract; the remaining fibers, forming the smaller anterior corticospinal tract, descend anteriorly in the white matter of the spinal cord to terminate in the anterior horns. See also pyramidal tract.

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Psychology term of the day

May 10th 2024

estimator

estimator

n. a quantity calculated from the values in a sample according to some rule and used to give an approximation of the value in a population. For example, the sample mean or average is an estimator for the population mean; the value of the sample mean is the estimate.