reticular substance(redirected from alpha substance)
1. a filamentous plasmatic material, beaded with granules, demonstrable by means of vital staining in the immature red blood cells; Synonym(s): alpha substance, filar mass, filar substance, substantia reticularis (1) , substantia reticulofilamentosa
2. Synonym(s): reticular formation
re·tic·u·lar sub·stance(rĕ-tik'yū-lăr sŭb'stăns)
1. A filamentous plasmatic material, beaded with granules, demonstrable by means of vital staining in the immature red blood cells.
2. Synonym(s): reticular formation.
The skein of threads present in some red blood cells. These are visible only when the cells are appropriately stained.
See also: substance
the material constituting an organ or body.
a substance that tends to decrease activity or blood pressure.
nerve tissue composed of predominantly nerve cell bodies, unmyelinated nerve fibers, and supporting tissue. See also gray matter.
the gel-like material in which connective tissue cells and fibers are embedded.
1. the white matter of the central nervous system, consisting of axons and their myelin sheaths.
2. the soft, marrow-like substance of the interior of such structures as bone, kidney and adrenal gland.
an undecapeptide present in the intestine, where it induces contraction of the intestine and dilatation of blood vessels; it is also present in a number of neuronal pathways in the brain and in primary sensory fibers of peripheral nerves, and may be a neurotransmitter associated with transmission of pain impulses.
1. anterior perforated substance, an area anterolateral to each optic tract, pierced by branches of the anterior and middle cerebral arteries.
2. posterior perforated substance, an area between the cerebral peduncles, pierced by branches of the posterior cerebral arteries.
a substance that raises blood pressure.
the netlike mass of threads seen in erythrocytes after vital staining.
those substances (e.g. glucose) excreted into the urine only when their concentration in plasma exceeds a certain value.
tissue consisting mostly of myelinated nerve fibers and constituting the conducting portion of the brain and spinal cord; see also white matter.