Oh wow, having chatGPT write as “oneliners, breadcrumbs format, and asking to to go further left in the breadcrumbs, it gladly fills it all in. – and you can go to the right as well. I started with the LC and quickly ended up with this:
Spinal cord > Medulla oblongata > Pons > Midbrain > Diencephalon > Telencephalon > Periaqueductal gray (PAG) > Rostral Ventromedial Medulla (RVM) > Locus coeruleus (LC) > Thalamus > Cerebral cortex