from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or pertaining to the cerebral cortex and the brainstem, especially with regard to the corticobulbar tract, a white matter pathway connecting the two.
cortico- + bulbar (Wiktionary)
The two pyramids contain the motor fibers which pass from the brain to the medulla oblongata and medulla spinalis, corticobulbar and corticospinal fibers.