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What is the meaning of “the inner leaflet of their lipid bilayer corresponds to the outer leaflet of the plasmalemma.”

What is the meaning of “the inner leaflet of their lipid bilayer corresponds to the outer leaflet of the plasmalemma.”


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The whole quote is, “Their lumen corresponds topologically to the outside of the cell; consequently, the inner leaflet of their lipid bilayer corresponds to the outer leaflet of the plasmalemma.” The “they” corresponds fo the vacuolar apparatus of a cell. My question here is, how is it possible for the inner leaflet of the vacuolar apparatus to lie on the outer leaflets of the plasma membrane? Wouldn't this mean that the vacuolar apparatus partly lies outsides the cell? Or am I mistaken? The excerpt is from Chapter 4 of Principles of Neural Science by Kandel et al.


I don't have Kandel in front of me but I am pretty sure I know what your book is trying to say. The specific language they've chosen for this section is quite odd and I believe old-fashioned, though, which might be leading to your confusion.


Transferring membrane-bound material from intracellular organelles to the surface of a cell involves or vice-versa involves fusing vesicles with the plasma membrane or budding vesicles from the plasma membrane. The process is more or less the same, just in reverse. See the diagram below:

Adapted from https://en.wikipedia.org/wiki/Golgi_apparatus#/media/File:0314_Golgi_Apparatus.jpg">https://en.wikipedia.org/wiki/Topology


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