PSY 3126 Lecture Notes - Neural Coding, Cranial Nerves, Vagus Nerve

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The main flow of taste information: taste buds primary gustatory axons brain stem thalamus cerebral cortex (see fig. These nerves synapse within the slender gustatory nucleus. The conscious experience of taste is presumably mediated by the cerebral cortex. Neurons of the gustatory nucleus synapse on a subset of small neurons in the ventral posterior medial (vpm) nucleus. These vpm taste neurons then send axons to the primary gustatory cortex. The taste pathways to the thalamus and cortex are primarily ipsilateral to the cranial nerves that supply them. Lesions within the vpm thalamus or the gustatory cortex can cause ageusia. If you were going to design a system for coding tastes, you might begin with many specific taste receptors for many basic tastes. Each receptor type will be connected by separate axons to neurons in the brain that also responded to only one specific taste. Therefore, there will be specific neurons responding to sweet", sour" and etc.

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