myelin sheath

the insulating layer around many axons that increases the speed of conduction of nerve impulses. It consists of myelin and is laid down by glia, which wrap themselves around adjacent axons. The myelin sheath is interrupted by small gaps, called nodes of Ranvier, which are spaced about every millimeter along the axon. Also called medullary sheath.

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Psychology term of the day

December 18th 2024

experiment-wise error rate

in a test involving multiple comparisons, the probability of making at least one Type I error over an entire research study. The experiment-wise error rate differs from the testwise error rate, which is the probability of making a Type I error when performing a specific test or comparison.