Lamella (cell biology)
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For other uses, see Lamella.
A lamella, in cell biology, is an extension of a thylakoid within a chloroplast, linking a thylakoid within one granum to one in another. They are the sites of photosystem I. Simply put, lamellae may be considered as a pair of membranes containing chlorophyll.
The middle lamella is a pectin layer which cements the cell walls of two adjoining cells together. Plants need this to give them stability and so that they can form plasmodesmata between the cells.It is the first layer which is deposited at the time of cytokinesis.
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