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substantia, pl. substantiae (sub-stan´she-a, -she-e) [NA]

substance [L.]
s. adamanti´naenamel
s. al´ba [NA] white matter
s. basophi´liaNissl substance
s. cine´reagray matter
s. compac´ta [NA] compact bone
s. compac´ta os´siumcompact bone
s. cortica´lis [NA] cortical bone
s. ebur´neadentin
s. ferrugin´ea [NA] locus ceruleus
s. fundamenta´lisground substance
s. gelatino´sa [NA] gelatinous substance
s. gelatino´sa centra´liscentral and lateral intermediate substance
s. glandula´ris pros´tataeglandular substance of prostate
s. gris´ea [NA] gray matter
s. gris´ea centra´lis [NA] central gray substance
s. innomina´tainnominate substance
s. interme´dia centra´lis et latera´lis [NA] central and lateral intermediate substance
s. len´tis [NA] substance of lens of eye
s. medulla´ris 1. medulla 2. medullary substance
s. muscula´ris prosta´tae [NA] muscular substance of prostate
s. ni´gra [NA] a large cell mass, crescentic on transverse section, extending forward over the dorsal surface of the crus cerebri from the rostral border of the pons into the subthalamic region; it is composed of a dorsal stratum of closely spaced pigmented (i.e., melanin-containing) cells, the pars compacta, and a larger ventral region of widely scattered cells, the pars reticulata; the pars compacta in particular includes numerous cells that project forward to the striatum (caudate nucleus and putamen) and contain dopamine, which acts as the transmitter substance at their synaptic endings; other, apparently non-dopaminergic cells of the s. nigra project to a rostral part of the ventral nucleus of thalmus, the middle layers of the superior colliculus and to restricted parts of the reticular formation of the midbrain; the nigrostriatal projection is reciprocated by a massive striatonigral fiber system with multiple neurotransmitters, chief among which is gamma-aminobutyric acid (GABA); s. n. receives smaller afferent projections from the subthalamic nucleus, the lateral segment of the globus pallidus, the dorsal nucleus of the raphe and the pedunculopontine nucleus of the midbrain. The pars reticulata forms part of the output system for the striate body. The s. n. is involved in the metabolic disturbances associated with Parkinson's disease and Huntington's niger, nucleus niger, Soemmerring's ganglion;
s. os´sea den´tiscementum
s. perfora´ta ante´rior [NA] anterior perforated substance
s. perfora´ta poste´rior [NA] posterior perforated substance
s. pro´pria cor´neae [NA] substantia propria of cornea
s. pro´pria membra´nae tym´paniproper substance of tympanic membrane, the layer of radial and circular collagenous fibers of the tympanic membrane.
s. pro´pria scle´rae [NA] proper substance of the sclera, the dense white fibrous tissue arranged in interlacing bundles that forms the main mass of the sclera, continuous anteriorly with the substantia propria corneae.
s. reticula´ris 1. reticular substance (1) 2. reticular formation
s. reticulofilamento´sareticular substance (1)
s. spongio´sa [NA] bone in which the spicules or trabeculae form a three-dimensional latticework (cancellus) with the interstices filled with embryonal connective tissue or bone marrow.s. trabecularis [NA] , cancellous bone, spongy bone (1) , spongy substance, trabecular bone;
s. trabecula´ris [NA] s. spongiosa
s. vit´reaenamel


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