The signals generated by our smell sensation are carried by two cranial nerves (olfactory and trigeminal) to the various cortical regions involved in the processing of olfactory information as it passes to the brain. Much of the sensation we consider to be taste is actually olfactory, which is why our experience of smell and taste are closely linked. Head trauma, such as frontal skull fracture, occipital injury, or nasal fracture can cause smell deficiencies.

The smell pathway