substantia nigra


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Related to substantia nigra: dopamine, Cranial nerves, basal ganglia, striatum

substantia ni·gra

 (nī′grə, nĭg′rə)
n.
A layer of large pigmented nerve cells in the midbrain that produce dopamine and whose destruction is associated with Parkinson's disease.

[New Latin : Latin substantia, substance + Latin nigra, feminine of niger, black.]

substantia nigra

(səbˈstænʃə ˈnaɪɡrə)
n
(Anatomy) a layer of grey matter in the brain that produces dopamine and contains pigmented nerve cells, loss of which has been associated with Parkinson's disease
[C20: from Latin, literally: dark material]

sub•stan•ti•a ni•gra

(səbˈstæn ʃi ə ˈnaɪ grə, ˈnɪg rə)

n., pl. sub•stan•ti•ae ni•grae (sʌbˈstæn ʃiˌi ˈnaɪ gri, ˈnɪg ri) substantia ni•gras.
a deeply pigmented area of the midbrain containing dopamine-producing nerve cells.
[1880–85; < New Latin: black substance]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.substantia nigra - a layer of deeply pigmented grey matter in the midbrain; associated with the striate body; is involved in metabolic disturbances associated with Parkinson's disease and with Huntington's disease
neural structure - a structure that is part of the nervous system
mesencephalon, midbrain - the middle portion of the brain
References in periodicals archive ?
It is associated with old age, and characterized by the loss of neurons in the substantia nigra region of the brain.
Keywords: dopamine neuron, levodopa treatment, movement disorders, MPTP Parkinson, Parkinson disease, Parkinson disease treatment, PD genes, substantia nigra
Parkinson's is caused by a loss of nerve cells in part of the brain called the substantia nigra.
It works as a messenger that transfers signals in an area in the brain called the substantia nigra to produce smooth, controlled movements.
Metabotropic glutamate receptors (mGluRs) are G-protein coupled receptors that contain the binding site for glutamate, and mGlu4, specifically, is localized to presynaptic terminals in a region of the brain called the substantia nigra pars compacta (SNpc).
Combined R2* and diffusion tensor imaging changes in the substantia nigra in Parkinson's disease.
This is either by interneurons which are dispersed among the dopamine neurons (13,19) or via GABAergic inputs to the VTA such as direct inputs from the nucleus accumbense, (19,23) ventral pallidum, (23,24) reticulate parts of substantia nigra (13,25) and the bed nucleus of the stria terminalis.
Recent studies at Johns Hopkins and Pennsylvania State Colleges have found evidence for brain iron deficiency in an area called substantia nigra as a cause for primary RLS demonstrated in cerebrospinal fluid studies.
Consistent with this, we have recently shown that continuous (three months) bright light exposure of rats induces formation of neuromelanin and reduces tyrosine hydroxylase positive neurons in the substantia nigra [9].
(6,7) One hypothesis posits that abnormal protein aggregates characteristic of PD appear first in the olfactory structures and enteric nerve, then spread by a prion-like cell-to-cell transfer to the substantia nigra. (8) Some studies suggest that PD may originate in the cells of the nasal cavity or intestines and spread to the central nervous system and the brain.
The motor symptoms of Parkinson's disease result from the death of dopamine-generating cells in the substantia nigra, a region of the midbrain; the cause of this cell death is unknown.

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