The cells of Schwannomas have many ultrastructural features in common with the Schwann cells from which they derive, and show a similar tendency to envelop other structures concentrically. The presence of continuous basement membrane and the absence of pinocytotic vesicles or cell junctions distinguishes the tumour cells from perineurial cells, which may be present in the tumour but do not appear to participate actively in the neoplastic process.
KeywordsBasement Membrane Pinocytotic Vesicle Interlocking Pattern Perineurial Cell Concentric Lamella
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