The phrase "entire circuit" refers to completing a full circle or loop, usually in relation to an electrical or physical pathway. It means going from the starting point back to the same point, without any interruptions or breaks. Full definition
Current microscopes and objectives are designed to focus light with great precision onto a single point in space, but targeting the activity of entire circuits of neurons will require the ability to image them in three dimensions. (kavlifoundation.org)
Routinely wire entire circuits end to end. (jobhero.com)