You're misinterpreting the sentence. It doesn’t mean “muscles surrounding the hippocampus” (which wouldn’t make sense since the hippocampus is in the brain and

You're misinterpreting the sentence. It doesn’t mean “muscles surrounding the hippocampus” (which wouldn’t make sense since the hippocampus is in the brain and isn’t surrounded by muscle). It’s referring to skeletal muscles throughout the body. During a stress response, glucose gets diverted to those muscles to prepare for action (fight or flight). This can reduce glucose availability for the brain, including the hippocampus, potentially impairing its function. And yea, no idea why that source is cited. I don’t see anything in that study about glucose or muscles either. Seems like a bad citation or extrapolation.