Medulla

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The central portion of some animal fibres consisting of a series of cavities formed by the medullary cells which collapse during the growth process. In some fibres e.g., wool and kemp, the medulla forms the greatest portion of the fibre and is surrounded by a comparatively thin layer of cortex

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The hollow, rounded cells which are found along the center of the main axis of a fiber. They may run continuously along the length of the fiber

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