HTHSCI 2FF3 Lecture Notes - Lecture 4: Bronchus, Facial Nerve, Styloglossus
1 Nov 2016
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Document Summary
Gi tract is a food disassembly line, in oral cavity we begin digestive process, mechanically through mastication, chemically to break down some of the complex sugars (i. e. lingual lipase). Break down proteins to amino acids, carbs to sugars, lipids to their components. Peristalsis: alternating waves of muscle contraction and relaxation used to move food through the gi tract. Regulated by enteric nervous system (a branch of the peripheral ns). Structures to note: lower/upper labia (lip): keep food in oral cavity while masticating. Tonsils - for an immediate response to pathogens in food. Gustatory receptor cells: they are modified neuronal cells that are constantly renewing (as conditions which this tissue resides in is harsh: acidic medium, saliva). Signals will synapse with sensory neurons and are relayed through the thalamus to the primary gustatory cortex in temporal lobe. Recall that all cn arise from their nuclei in the brainstem. Cn ix (glossopharyngeal): conveys sensation from posterior 1/3 of tongue.
