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forebrain

American  
[fawr-breyn, fohr-] / ˈfɔrˌbreɪn, ˈfoʊr- /

noun

Anatomy.
  1. Also called prosencephalon.  the anterior of the three primary divisions of the brain in the embryo of a vertebrate, or the part of the adult brain derived from this tissue including the diencephalon and telencephalon.

  2. the telencephalon.


forebrain British  
/ ˈfɔːˌbreɪn /

noun

  1. the nontechnical name for prosencephalon

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

forebrain Scientific  
/ fôrbrān′ /
  1. The forwardmost part of the vertebrate brain. In humans, it consists of the thalamus, the hypothalamus, and the cerebrum.

  2. Compare hindbrain midbrain


Etymology

Origin of forebrain

First recorded in 1875–80; fore- + brain

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

The striatum sits deep in the forebrain and plays a role in movement planning, decision-making, motivation, reinforcement, and how the brain responds to rewards.

From Science Daily May 10, 2026

The neuron density of its forebrain — the region engaged with planning, sensory processing, and emotional responses, and on which REM sleep is largely dependent — is comparable to that of primates.

From New York Times Mar. 26, 2024

As a result, the system organized itself to mimic the forebrain, midbrain, hindbrain and spinal cord in a way that mirrors embryonic development.

From Science Daily Feb. 26, 2024

In this week’s issue of Cell, a research team in Europe reports using fetal brain tissue to grow 3D structures that resemble those that naturally occur in the cortex, forebrain, or spinal cord.

From Science Magazine Jan. 10, 2024

Figure 5C passes through the posterior region of the pharynx, ph, the tip of the forebrain, fb, the anterior edge of the heart, ht, and the curve of the tail, t.

From Development of the Digestive Canal of the American Alligator by Reese, C. M.

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