substantia /sub·stan·tia/ (sub-stan´shah) pl. substan´tiae [L.] substance.
substantia alba
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.
substantia al·ba ( l b )n. See white matter. |
substantia alba
[-stan′shə]
Etymology: L, substantia, essence, albus, white
the part of the central nervous system that is enclosed in myelin sheaths. The myelin contributes a white coloring to otherwise gray nerve tissue.
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.
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