substantia


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substantia

 [sub-stan´she-ah] (L.)
substance; used in anatomic nomenclature in naming various components of body tissues or structures.
substantia al´ba white matter.
substantia gelatino´sa the substance sheathing the posterior horn of the spinal cord and lining its central canal.
substantia gri´sea gray matter.
substantia ni´gra a dark layer of gray matter separating the tegmentum of the midbrain from the crus cerebri.

sub·stance

(sŭb'stănts),
Material.
Synonym(s): substantia [TA], matter
[L. substantia, essence, material, fr. sub- sto, to stand under, be present]

substantia

/sub·stan·tia/ (sub-stan´shah) pl. substan´tiae   [L.] substance.
substantia al´ba  the white nervous tissue, constituting the conducting portion of the brain and spinal cord, composed mostly of myelinated nerve fibers.
substantia ferrugi´nea  locus caeruleus.
substantia gelatino´sa  the gelatinous-appearing cap forming the dorsal part of the posterior horn of the spinal cord.
substantia gri´sea  gray substance; the gray nervous tissue composed of nerve cell bodies, unmyelinated nerve fibers, and supportive tissue.
substantia ni´gra  the layer of gray substance separating the tegmentum of the midbrain from the crus cerebri.
substantia pro´pria 
1. the tough, fibrous, transparent main part of the cornea, between Bowman's membrane and Descemet's membrane.
2. the main part of the sclera, between the episcleral lamina and the lamina fusca.

sub·stance

(sŭb'stăns)
Material.
Synonym(s): substantia [TA] , matter.
[L. substantia, essence, material, fr. sub-sto, to stand under, be present]

substantia

pl. substantiae [L.] substance.

substantia alba
the white matter of the spinal cord and the brain.
substantia compacta
compact bone.
substantia gelatinosa
the substance sheathing the posterior horn of the spinal cord and lining its central canal.
substantia grisea
the gray matter of the spinal cord and brain.
substantia grisea centralis
the central gray matter that surrounds the cerebral aqueduct.
substantia nigra
the layer of gray substance separating the tegmentum of the midbrain from the crus cerebri.
substantia propria corneae
layer of transparent lamellated fibrous connective tissue which constitutes the bulk of the cornea; composed of collagen fibers disposed in platelike formations, fibroblasts and ground substance with many nerve fibers but no blood vessels.
substantia propria choroid
loose connective tissue of the choroid.
References in periodicals archive ?
Specifically, the neurons of the striatum extend to the internal globus pallidus (direct pathway), the external globus pallidus (indirect pathway), and the substantia nigra (indirect pathway).
The sections include (1) middle frontal gyrus; (2) superior and middle temporal gyri; (3) inferior parietal lobule; (4) occipital cortex; (5) anterior cingulate gyrus; (6) amygdala; (7) hippocampus with dentate gyrus and entorhinal cortex; (8) basal ganglia at the level of the anterior commissure with caudate, putamen, globus pallidus, and the nucleus basalis of Meynert; (9) thalamus with subthalamic nucleus; (10) cerebellar cortex and dentate nucleus; (11) midbrain with substantia nigra; (12) pons with locus coeruleus; (13) and medulla with dorsal motor nucleus of the vagus and hypoglossal nucleus.
Substantia nigra: A brain structure located in the midbrain (i.
In ventral midbrain, particularly in substantia nigra pathological features show that DA neurons progressively degenerate, DA cannot synthesize in substantia nigra pars compacta.
Under this theory, Parkinson's only progresses to the substantia nigra and cortex over the years.
PD occurs when the neurons that produce dopamine, found in the substantia nigra of the human brain, slowly degenerate and result in a lack of the neurotransmitter dopamine.
Rather than beginning in the substantia nigra and moving into the cerebellar regions, nerve damage may begin in the dorsal motor nucleus of the vagal nerve and progress upward into the midbrain, killing neurons all along its path.
13 The substantia nigra and locus caeruleus in the midbrain and pons respectively are pale due to loss of pigment.
Although it is possible that both of the diseases may lie on a continuum of a single disease that begins with ADHD manifested in childhood and continues into adulthood as dementia with Lewy bodies "when neuronal loss and gliosis in the substantia nigra, locus coeruleus, and nucleus basalis of Meynert occur," the authors doubted that this hypothesis could be accurate because low dopamine levels in ADHD are not initially associated with Parkinsonlike or DLB symptoms.
In addition, the cogito ergo sum implies a sum res cogitans, meaning that being's essence is thinking whereas res is the scholastic substantia (concrete entity).
The loss of dopaminergic neurons in the substantia nigra region of the brain is 1 pathological hallmark in patients with PD.
It results from and manifests the relationship between substantia humana and substantia rerum [human substance and the substance of things], the in-between acquiring form.