This M2 internship aims to study the cerebral vascular network using the tools of network physics. In particular, it will seek to analyze the communities present in cerebrovascular networks and understand their role in reducing blood flow in the brain. This reduction plays a significant role in triggering cerebrovascular diseases, such as hypoperfusion dementia or Alzheimer's disease. The supervising team includes a specialist in blood flow mechanics aand physicists with expertise in network theory. The internship will utilize mathematical tools from network theory and experimental data from real vascular networks. This internship is part of an interdisciplinary project aiming to develop a new approach to studying blood circulation in the brain and its effect on degenerative diseases. The internship will be supervised by a team of researchers from the Laboratory of Theoretical Physics and the Institute of Fluid Mechanics in Toulouse, which has connections with biology and medical laboratories studying the brain in France and abroad. The internship will also be conducted in collaboration with Olivier Giraud from the Laboratory of Theoretical Physics and Statistical Models at Paris-Saclay University. The project will require both numerical simulations and analytical calculations. Depending on the candidate's academic level and motivation, the internship could lead to a PhD (funding for a PhD is currently being applied for but is not yet guaranteed).