cortex
cor·tex / ˈkôrˌteks/ • n. (pl. -ti·ces / -təˌsēz/ ) Anat. the outer layer of the cerebrum (the cerebral cortex), composed of folded gray matter and playing an important role in consciousness. ∎ an outer layer of another organ or body part such as a kidney (the renal cortex), the cerebellum, or a hair. ∎ Bot. an outer layer of tissue immediately below the epidermis of a stem or root. DERIVATIVES: cor·ti·cal / ˈkôrtikəl/ adj.
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cortex
cortex, in botany, term generally applied to the outer soft tissues of the leaves, stems, and roots of plants. Cortical cells of the leaves and outer layers of nonwoody stems contain chloroplasts, and are modified for food storage (usually in the form of starch) in roots and the inner layers of stems and seeds. Because of the combination of its soft texture (especially after cooking) and its role as a food storage tissue, the cortex is the predominant plant tissue eaten by humans and other animals.
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cortex
1. (in botany) The tissue between the epidermis and the vascular system in plant stems and roots. It is composed of parenchyma cells and shows little or no structural differentiation. Cortex is produced by activity of the apical meristem. See also endodermis.
2. (in zoology) The outermost layer of tissue of various organs, including the adrenal glands (adrenal cortex), kidneys (renal cortex), and cerebral hemispheres (cerebral cortex).
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cortex
1. In vertebrates, the cerebral cortex is a layer of grey matter lying above each cerebral hemisphere (cerebellum) in the brain.
2. In Heliozoa, an outer sphere of ectoplasm, often greatly vacuolated.
3. In some sessile, aquatic invertebrates, a fibrous outer layer of the periderm.
4. In some Porifera (e.g. Calcarea), an outer surface consisting of a syncitium formed from the interconnecting pseudopodia of amoebas.
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cortex
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cortex
—cortical (kor-ti-kăl) adj.
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cortex
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