swallowing

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swallowing

 [swahl´o-ing]
the taking in of a substance through the mouth and pharynx and into the esophagus. It is a combination of a voluntary act and a series of reflex actions. Once begun, the process operates automatically. Called also deglutition.

The Three Stages of Swallowing. In the first, voluntary, stage of swallowing, the cheeks are sucked in slightly and the tongue is arched against the hard palate, so that the bolus, or ball of chewed food, is moved to the pharynx.



Normally, air is free to pass from the nose or mouth to the lungs and back again. But the moment the bolus approaches the fauces, the passage from the mouth to the pharynx, nerve centers are triggered that control a series of reflex actions. After one quick inhalation, breathing is halted for the brief instant of the next stage.

In this second, involuntary, stage of swallowing, the rear edge of the soft palate, which hangs down from the roof of the mouth, swings up against the back of the pharynx and blocks the passages to the nose. The back of the tongue fits tightly into the space between two muscular pillars at each side of the fauces, sealing the way back to the mouth. Simultaneously, the larynx moves upward against the epiglottis, effectively closing the entrance to the trachea.

Sometimes the larynx does not move up quickly enough and food gets into the air passage, stimulating a coughing reaction. With the one-way route to the stomach firmly established, however, the muscular coat of the pharynx contracts, squeezing the ball of food and forcing its passage into the esophagus.

In the third stage, the rhythmic contraction (peristalsis) of the muscles of the esophagus moves the food on to the stomach. The cardiac sphincter keeps the stomach entrance closed until food is swallowed. As the food approaches, moved by the wavelike contractions of the esophagus, the advancing portion of the wave causes the sphincter to relax and open, while the rear and contracting portion forces the ball of food through the entrance.
impaired swallowing a nursing diagnosis accepted by the North American Nursing Diagnosis Association, defined as a state in which an individual has decreased ability to voluntarily pass fluids or solids from the mouth to the stomach.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

swallowing

(swal'o-ing)
Enlarge picture
SWALLOWING
A complicated act, usually initiated voluntarily but always completed reflexively, whereby food is moved from the mouth through the pharynx and esophagus to the stomach. It occurs in the following three stages. Synonym: deglutition

In the first stage, food is placed on the surface of the tongue. The tip of the tongue is placed against the hard palate; then elevation of the larynx and backward movement of the tongue forces food through the isthmus of the fauces in the pharynx.

In the second stage, the food passes through the pharynx. This involves constriction of the walls of the pharynx, backward bending of the epiglottis, and an upward and forward movement of the larynx and trachea. This may be observed externally with the bobbing of the Adam's apple. Food is kept from entering the nasal cavity by elevation of the soft palate and from entering the larynx by closure of the glottis and backward inclination of the epiglottis. During this stage, respiratory movements are inhibited by reflex.

In the third stage, food moves down the esophagus and into the stomach. This movement is accomplished by momentum from the second stage, peristaltic contractions, and gravity. With the body in an upright position, liquids pass rapidly and do not require assistance from the esophagus. However, second-stage momentum and peristaltic contractions are sufficient to allow liquids to be drunk even when the head is lower than the stomach.

Difficulty in swallowing is called dysphagia. See: dysphagia; illustration

air swallowing

Voluntary or involuntary swallowing of air. It occurs involuntarily in infants as a result of improper feeding. Adults may swallow air during eating or drinking.

impaired swallowing

Abnormal functioning of the swallowing mechanism associated with deficits in oral, pharyngeal, or esophageal structure or function.

tongue swallowing

See: tongue-swallowing
Medical Dictionary, © 2009 Farlex and Partners

Patient discussion about swallowing

Q. Is it dangerous to swallow a bubble gum? My 4 year old child always swallows his chewing gum and I am worried that it can harm him

A. what about when your 45 yrs old and still swallowing gum? we had a debate with my older sister about this.

Q. Why is it hard to swallow when you have a sore throat? I was sick last week. I had a sore throat pain in my neck and fever. the most annoying symptom that i had was pain during sallowing. what is the source of that pain, and what can I do to ease it next time?

A. When you have an inflammation in your body, the sick area hurts when its palpated. when your neck is inflamed, you have a pain in the neck. when the inside part of the neck is inflamed you have tonsillitis.
When you eat something, it touches your inside of the neck, and if it's inflamed it will be painful.
The good news is that you can treat this pain in the same way you treat other inflammatory pain - hot (NOT boiling) tea.

Q. mouth ulcer and difficulty to swallow, below right side of inner tongue guggle salt water and vinigar dose'nt help

A. how big is it? mouth ulcers has a reason why they happen. sometimes a broken tooth, biting a sharp metal, a prosthetic that doesn't sit well..that sort of things. but sometimes it is caused by other stuff. any way, oral hygiene may relieve some of the symptoms. Topical (rubbed on) antihistamines, antacids, corticosteroids, or other soothing preparations may be recommended for applying on top of the ulcer. Avoid hot or spicy foods.

More discussions about swallowing
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