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Forum: Week 4 Discussion Thread: Describe the neural control of salivation and swallowing
escribe the neural control of salivation and swallowing
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Sean Mercier Leclerc
1 day ago
Describe the neural control of salivation and swallowing
Hello class today I am going to be doing my discussion on Describe the
neural control of salivation and swallowing. Your salivary glands secrete
about one to one and a half liters of saliva a day. This is mainly because it
is responding to food in your mouth. Salivation is controlled mainly by
parasympathetic nerve fibers that originate in a group of salivatory nuclei,
located in the brainstem near the junction of the pons and medulla
oblongata (Saladin, 2018). Preganglionic fibers travel from the medulla
oblongata to a ganglia in nearby salivary gland by the way of the facial
and glossopharyngeal. From there postganglionic fibers finishes the path
to the gland cells. Sympathetic nerve fibers also innervate the salivary
gland, originating in the superior cervical ganglion of the sympathetic
chain and following blood vessels to the glands (Saladin, 2018).
Sympathetic stimulation only increase production slightly in salivation.
Swallowing, or deglutition is a complex action involving over 22 muscles in
the mouth, pharynx, and esophagus, coordinated by the swallowing
center, a pair of nuclei in the medulla oblongata (Saladin, 2018). The
swallowing center communicates with the muscles of the pharynx and
esophagus by way of the trigeminal, facial, glossopharyngeal, and
hypoglossal nerves. Swallowing has three phases the oral phase, the
pharyngeal phase, and the esophageal phase. The oral phase is under
voluntary control (Saladin, 2018). While chewing the tongue collects food,
presses it against the palate to form a bolus, and pushes it posteriorly
(Saladin, 2018). The pharyngeal phase is involuntary. The soft palate and
root of the tongue block food and drink from entering the nasal cavity or
reentering the mouth (Saladin, 2018). The esophageal phase is the last
phase of swallowing. It is a wave of involuntary contractions called
peristalsis, controlled jointly by the brainstem swallowing center and the
myenteric plexus in the esophageal wall (Saladin, 2018).
Saladin, K. Sullivan, S, and Gan, C. (2018). Anatomy & Physiology: The
Unity of Form and Function. 8th ed. New York: McGraw Hill, G. 3- G.4

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