Latent tendencies, memories of this life and brain damage, dementia

This question is from the Theravada perspective only. 1. How are memories of this life stored and recalled? Is it stored in the physical brain? 2. There is the concept of latent tendencies (anusaya). Conceit is one of them. How are the latent tendencies of this life stored? Is it stored in the physical brain? 3. Does the bhavanga-citta of the Abhidhamma include some kind of storage function or not? If yes, what does it store? 4. If someone suffers from brain damage or dementia, they can lose their memories and/or have their personality altered (possibly including some change in latent tendencies). How does this work within the Theravada framework for moment to moment birth and death? The answer to this question may depend on the earlier questions.