How can damage to the olfactory nerve cause anosmia and reduced flavor perception?

The olfactory nerve, composed of axons from bipolar cells in the nasal mucosa, is essential for detecting odors. Damage to this nerve—often caused by head injury, local nasal disease, or pressure from a tumor—can result in anosmia, which is the complete loss of the ability to detect odors.12

The reduction in flavor perception occurs because flavor is a complex perception resulting from the combination of both taste and smell. When eating, odors from food travel through the internal nares to the olfactory epithelium. Because the olfactory system and the taste receptor system are distinct, damage to the olfactory nerve disrupts the olfactory component of this process. Even if the taste buds remain fully functional, the loss of olfactory input prevents the brain from integrating smell with taste, leading to a diminished overall experience of flavor.32

Would you like to learn more about how the olfactory bulb processes these signals or how other cranial nerves contribute to sensory perception?