L20 HNS
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Taste From anterior 2/3 of the tongue are carried by the | Chorda tympani nerve (branch of the facial nerve). |
From the posterior 1/3 of the tongue are carried by the | Glossopharyngeal nerve |
First order neurons of Gustatory Pathway | From the taste buds to the gustatory nucleus (nucleus solitarius) |
Second order neurons of Gustatory Pathway | From the gustatory nucleus (nucleus solitarius) to ipsilateral medial lemniscus and pass directly to the (VPMNT) |
Complete loss of taste | Ageusia |
Taste hallucinations | Phantogeusia |
Yellow-brown pigments, tubular Bowman's glands& absence of rhythmic ciliary movements | Olfactory Mucosa |
Olfactory Mucosa innervated by | Olfactory (cranial I) nerve& trigeminal |
1storder neuron The Olfactory Pathways | Olfactory receptors pass through the cribriform plate to end in the glomeruli in the olfactory bulb. |
2ndorder neurons in The Olfactory Pathways | Mitral and tufted cells present in the olfactory bulbs that leaves the bulb to the olfactory cortex |
Inhibitory interneurons present in the bulb that produce GABA to inhibit mitral and tufted cells | Periglomerularcells & Granule cells |
Area associated with Learning to like or dislike certain foods & Behavioral responses to food nausea and vomiting | Prepyriform and pyriform cortex + cortical portion of the amygdaloid nuclei |
Responsible for the conscious perception of olfaction i.e. analysis, interpretation and significance of the odour | The dorsomedial thalamic nucleusand that project to the orbitofrontal cortex |