Subependymal grey matter heterotopia, also known as periventricular heterotopia, is the most common form of grey matter heterotopia and is characterised by nodules of grey matter located immediately beneath the ependyma of the lateral ventricles. It can be divided according to morphology into 2 1  : unilateral focal.
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Mining crusher operations. Mining crusher operations are often categorized by the size to which they break down material that is fed into the machinery. Mining crusher machinery has phases of crushing to ensure that force is distributed throughout an efficient process designed to prevent break down of machine parts.