प्रांतस्था (Praanstastha) - This is the most common and literal translation.
Other possible translations include:
* बाह्य परत (Baahya Parat) - Meaning outer layer
* छाल (Chhaal) - Meaning bark (used in the context of brain or tree bark)
The specific translation depends on the context in which "cortex" is being used.