The nasal cavity is divided into two segments: the respiratory segment and the olfactory segment.
The olfactory segment is lined with a specialized type of pseudo-stratified columnar epithelium, known as olfactory epithelium(olfactory mucous membrane), which contains receptors for the sense of the smell.
This segment is located along the dorsal roof of the nasal cavity
On each side, the myelinated but relatively slowly conducting taste fibers in these three nerves unite in the nucleus of the tractus solitarius in the medulla oblongata.
There,they synapse in second-order neurons,the axons of which cross the midline join the medial leminiscus,ending with fibers for touch,pain and temperature in the specific sensory relay nuclei of the thalamus.
Impulses are relayed from there to the cerebral cortex at the foot of the postcentral gyrus.
Dysgeusia is the distortion of the sense of taste.
The distortion in the sense of taste is the only symptom, and diagnosis is usually complicated since the sense of taste is tied together with other sensory systems.
Common causes of dysgeusia include chemotheraphy, asthma treatment with albuterol, and zinc deficiency.
Due to the variety of causes of dysgeusia, there are many possible treatments that are effective in alleviating or terminating the symptoms of dysgeusia. These include artificial saliva, pilocarpine, zinc supplementation, alterations in drug therapy, and alpha lipoic acid.