UNMYELINATED

adjective. depicting a nerve fiber which lacks a myelin sheath.

UPPER MOTOR NEURON

any of the primary motor cortex's neurons, which aid the corticospinal tract and impact and modulate the lower motor neurons.

URECHOLINE

noun. a brand name for bethanechol.

USER-FRIENDLY

depicting a product or system which is easy to comprehend or utilize.

UTTERANCE

noun. a unit of spoken linguistics, that might be of any length but can generally be recognized by conversational turn-taking or via clear pauses...

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