If it's just important for working memory, then it would seem like they could get "you" back without them - assuming that working memory implementation across humans is mostly similar. You'd need analogs of glial cells, but not necessarily the exact
If possible, better ones. Working memory seems to be a human weak point.
http://www.scientificamerican.com/article.cfm?id=marijuana-reveals-memory-mechanism
I wonder what the implications are for brain preservation and whole brain emulation? If glial cells are important, then saving and emulating the neurons alone probably won't be enough.