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dilator

n.

1. a muscle or nerve that causes opening or enlargement of a bodily structure.

2. an instrument for opening up an orifice or passage in the body.

3. a drug or other agent that causes dilation or enlargement of an organ or opening. See vasodilator.

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Psychology term of the day

May 8th 2024

midbrain

midbrain

n. a relatively small region of the upper brainstem that connects the forebrain and hindbrain. It contains the tectum (and associated inferior and superior colliculi), tegmentum, and substantia nigra. Also called mesencephalon.