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The cephalic phase of digestion is the gastric secretion that occurs even before food enters the oral cavity.
When a person smells, thinks, sees or dreams about food,
all over sudden his/her body (through the physical senses) starts to crave for that food,
and the digestion process begins to take place through the stimulation which occurs in the brain.
In fact, it is said in science, that when a person, sees, smells, dream eating food,
that is when the strong craving of eating and the digestion process starts in his/her body.
The process through which this Cephalic phase goes in stages through the brain to the stomach:
Thinking of food (i.e. smell, sight) – Stimulates cerebral cortex,
and then Sends messages to the hypothalamus – to the medulla oblongata,
from there the stimulation travels to the parasympathetic nervous system by the vagus nerve –
to stomach (Gastric Glands in walls of fundus and body of stomach) – to secrete gastric juice.
