forebrain


Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.

prosencephalon

 [pros″en-sef´ah-lon]
1. the portion of the brain developed from the anterior of the three primary brain vesicles in the early embryo, comprising the diencephalon and telencephalon.
2. the most anterior of the primary brain vesicles; called also forebrain.

pros·en·ceph·a·lon

(pros'en-sef'ă-lon), [TA]
The anterior primordial cerebral vesicle and the most rostral of the three primary brain vesicles of the embryonic neural tube; it subdivides to form the diencephalon and telencephalon.
Synonym(s): forebrain vesicle ☆ , forebrain ☆ , proencephalon
[G. prosō, forward, + enkephalos, brain]

forebrain

/fore·brain/ (-brān) prosencephalon.

forebrain

(fôr′brān′)
n.
1. The most anterior of the three primary regions of the embryonic brain from which the telencephalon and diencephalon develop.
2. The segment of the adult brain that develops from the embryonic forebrain and includes the cerebrum, thalamus, and hypothalamus.

forebrain

pros·en·ceph·a·lon

(pros'en-sef'ă-lon) [TA]
The anterior primordial cerebral vesicle and the most rostral of the three primary brain vesicles of the embryonic neural tube; it subdivides to form the diencephalon and telencephalon.
Synonym(s): forebrain.
[G. prosō, forward, + enkephalos, brain]

forebrain

that part of the brain which gives rise to the CEREBRAL HEMISPHERES, olfactory lobes, the PINEAL GLAND, PITUITARY GLAND and the OPTIC CHIASMA (which carries nerve fibres from the eyes to the midbrain). It is marked by a constriction in the developing embryo where the brain appears to be three-lobed, the forebrain, MIDBRAIN and HINDBRAIN.

forebrain

References in periodicals archive ?
Characteristic, frequent TDP-43 immunoreactive lesions of HS were present in the subiculum, CA1, and dentate gyrus, as well as within adjacent limbic structures (amygdalae, entorhinal cortex) and in basal forebrain.
3]H] flumazenil (Ro15-1788) binding to forebrain membranes was quantified.
The role of the limbic forebrain in stress control suggests that differential involvement of the PFC, hippocampus, and amygdala may be responsible for prolonged drive.
6) The forebrain maldevelopment alterations produce facial malformations, ranging from the presence of a single upper central incisor to cyclopia.
Sections were counterstained with methyl green and quantified for the number of PHH3- and Tbr2-positive cells and total nuclei in the forebrain neuralepithelium using design-based stereology with Stereo-Investigator software (MicroBrightfield, V.
The DPA n-6 lipid in ForeBRAIN comes from the same Non-GMO algae strain as the first Pure One product and is safe for pregnant and nursing mothers.
Furthermore, most of the evidence presented will be based on experiments which tested the effects of complete or partial forebrain ablations, or the effects of chemical stimulation in different parts of the fish brain.
Newborn babies have approximately 200 billion brain cells but have very few connections between these cells in their forebrain.
Orexin has been shown to play a prominent role in sleep-wake regulation via actions within certain basal forebrain structures and in sleep/arousal disorders.
The comparisons we are able to make here are based on the new understanding of the avian brain that has come about during the past several decades, due to the pioneering studies of Harvey Karten that began in the 1960s and culminated with a new nomenclature for many of the structures in the bird forebrain (Reiner et al.
Their main sites are the pituitary secreting into the periphery and the hypothalamic secretion that in turn hooks up with projections to forebrain and hind-brain receptors (modulation of pain and a modifying influence, particularly upon nerve fiber connections within the autonomic nervous system).