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ventral horn

either of the bottom regions of the H-shaped pattern formed by the periaqueductal gray in the spinal cord. The ventral horns contain large motor neurons whose axons form the ventral roots. Also called anterior horn. Compare dorsal horn.

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Psychology term of the day

September 8th 2024

drift

drift

n.

1. a reduction in variation in genetic traits that can occur when sampling from continually smaller groups, such that some traits ultimately become excluded from possibility.

2. a reduction in the reliability of technical instruments orin the accuracy of observers over time. See instrument drift; observer drift.