thalamus

American  

[thal-uh-muhs] / ˈθæl ə məs /

noun

• thalami
  plural

1. Anatomy. the middle part of the diencephalon through which sensory impulses pass to reach the cerebral cortex.

2. Botany. a receptacle or torus.

3. Also called thalamium. an apartment for women in an ancient Greek house.

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thalamus British  

/ ˈθæləməs /

noun

1. either of the two contiguous egg-shaped masses of grey matter at the base of the brain

2. both of these masses considered as a functional unit

3. the receptacle or torus of a flower

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thalamus Scientific  

/ thăl′ə-məs /

• thalami
  plural

1. The part of the vertebrate brain that lies at the rear of the forebrain. It relays sensory information to the cerebral cortex and regulates the perception of touch, pain, and temperature.

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thalamus Cultural  

1. The part of the brain that coordinates nerve impulses relating to the senses of sight, hearing, touch, and taste.

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Other Word Forms

Derived Forms

• postthalamic
  adjective
• subthalamic
  adjective
• thalamic
  adjective
• transthalamic
  adjective
• thalamically
  adverb

Inflected Forms

Nouns

• thalami
  plural

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Etymology

Origin of thalamus

1695–1705; < New Latin; Latin: bedroom < Greek thálamos

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Compare meaning

How does thalamus compare to similar and commonly confused words? Explore the most common comparisons:

• hypothalamus vs. thalamus

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Explanation

The thalamus is an egg-shaped mass of gray matter that's located in the middle of the brain. The thalamus is responsible for transmitting sensory signals between different parts of the brain. The thalamus plays a crucial role in regulating consciousness, sleep, and alertness by directing sensory information to different parts of the brain. It receives input from sensory organs such as the eyes, ears, and skin and then relays that information to other regions of the brain for further processing. This important structure, which is located near the center of the brain, gets its name from the Greek word thalamos, which means "inner chamber."

Example Sentences

See Examples For:

thalamus thalami

This time, the researchers focused on signals coming from the thalamus, a structure deep inside the brain that helps relay information throughout the nervous system.

From Science Daily ● Sep. 4, 2026

The researchers observed that nerve fibers from the thalamus grew toward the cortex, while cortical fibers extended toward the thalamus.

From Science Daily ● Jan. 7, 2026

Synchronized activity was seen in PT and CT neurons, both of which send signals back to the thalamus.

From Science Daily ● Jan. 7, 2026

Using this system, the scientists showed that the thalamus plays a central role in shaping specialized neural circuits within the human cerebral cortex.

From Science Daily ● Jan. 7, 2026

That an irritative lesion in the line of the centripetal tracts can influence cortical life is shown by thalamus lesions in which hallucinations are sometimes present.

From Degeneracy Its Causes, Signs and Results by Eugene S. Talbot

Their brains are fused together by a neural bridge that connects them at their respective thalami.

From Slate ● Apr. 30, 2018

The two thalami touch in the center in most brains as the massa intermedia, which is surrounded by the third ventricle.

From Textbooks ● Jun. 19, 2013

The thalami are two elongated, ovoid structures on either side of the midline that make contact in the middle.

From Textbooks ● Jun. 19, 2013

It is unnecessary to consider the small parts above the thalami, the choroid plexus of blood vessels, the fornix or strip of nerve membrane, and the septum lucidum or delicate fibres under the corpus callosum.

From Buchanan's Journal of Man, May 1887 Volume 1, Number 4 by Joseph R. (Joseph Rodes) Buchanan

It would be at present an unwarrantable assumption to make, that these centers are therefore disconnected from the retina, at the optic thalami, the superior quadrigeminal bodies, or wheresoever.

From Harvard Psychological Studies, Volume 1 Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory. by Hugo Münsterberg

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