What is the difference between CA1-CA4 hippocampal subfields and dentate gyrus (DG) in negative regulation of hypothalamus? I`ve found only evidence that GR expression is more in CA1-2 and DG, while MR expression, on the contrary, is more in CA3. But there is not any information about morphological differences of hippocampal-hypothalamus connections among subfields and DG. All information I've found in PubMed articles is just about whole hippocampus and pathways to BSTN. What is the functional and morphological difference between hippocampal parts in HPA regulation?