A processor with cores is just a bunch of single cpus thrown together on a single IC (Integrated circuit)(That's why my /proc/cpuinfo shows 4 of them). A CPU is made up of some sub-units always including (according to von neumans computers) an ALU and a Control unit.
In a way, the CU is the "brain within the brain": Wikipedia
It handles the cpu data Bus, the memory registers and the I/O, with enable and set wires.
How does this work with multiple of them? Is like one of them chosen to be the cu of cus?
(I know this is a silly question sorry for that.. I just need to know it.. seriously)