If a broken nose pushed a bone fragment against the olfactory (smell) nerve, triggering an action potential, the person would register the sensation as a smell.
The definition of the nerve is any bundle of fibers that send sensory information to the brain via the central nervous system in different areas of the body. An example of a nerve is the nerve that tells your brain that you feel pain when you hit your toe against a rock.
In medicine and physiology, a sensation is the recording of (afferent) nerve impulses entering that part of the brain, the sensory nerve, and capable of such perception.
Nasal sensation comes from the ocular (V1) and maxillary (V2) parts of the trigeminal nerve. Ophthalmology has three main branches: tear, frontal, and nasal hairs.
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