A mental note: "Computational Cognitive Neuroscience" videos have a very informative moment about the inner workings of the hyppocampus in a context of the memory retrieval, where Randall O'Reilly compares data retrieval to a hash:
CA1 region of the hyppocampus as a "memory de-indexer", unpacking activity pattern when we retrieve the memory and activating related cortical areas.
Dentate gyrus and CA3 as networks forming the said pointer.
https://www.youtube.com/watch?v=AdRx73BfJrU&list=PLu02O8xRZn7xtNx03Rlq6xMRdYcQgEpar&t=168s