What nostril leads to the brain?

Both nostrils connect to the nasal cavity and ultimately lead to the brain through the olfactory system, but the right and left nostrils can have different roles in terms of airflow and sensory processing. The olfactory bulbs, responsible for the sense of smell, are located at the base of the brain and receive input from receptors in the nasal cavity. While there is no specific nostril that "leads" directly to the brain, the brain processes olfactory information from both nostrils. Some studies suggest that one nostril may be more dominant at different times, affecting the perception of smells.