First you must be known to this fact that deglutition means swallowing..
You also must be aware of the fact that Deglutition has got 3 stages..
1.ORAL phase
2.PHARYNGEAL phase
3. ESOPHAGEAL PHASE
Now first we must understand that when food goes from oral cavity to pharynx regurgitation back to oral cavity is prevented... similarly when food goes from pharynx to esophagus regurgitation from esophagus to pharynx is prevented... when food enters from esophagus to stomach regurgitation from stomach to esophagus is prevented....
This is extremely easy we don't even need a mind to understand this or to remember this its like Class 1 stuff...
Our first mnemonic is about the mechanisms which prevent the reflux of bolus from Stomach to Esophagus...
TONE AMPlifier
TONE= TONE of GE sphincter (GE=Gastroesophageal sphincter)
A=Angle (esophagus gastric angle)
M=Mucosal folds at lower end of esophagus
P=Pinch cock effect of diaphragm , Pressure {negative intrathoracic and positive intraabdominal}
How the reflux from esophagus to pharynx is prevented it very easy to understand.. Remember that Cricopharyngeus muscle is the point from where esophagus starts so this Cricopharyngeus muscle CONSTRICTION along with PERISTALSIS waves of esophageal muscles prevent the reflux...
Pharynx to to Oral cavity reflux is prevented by the TONGUE BASE( not the entire tongue).
The TONGUE BASE CONTRACTS as result of that the TONGUE BASE touches the SOFT PALATE and closes OROPHARYNGEAL ISTHMUS...
Now food bolus from pharynx can also go to other places like NASOPHARYNX ,LARYNX .... ENTRY to NASOPHARYNX is prevented by the contraction of SOFT PALATE against the PASSAVANT RIDGE... PASSAVANT RIDGE is part of posterior pharyngeal wall...
ENTRY to LARYNX is prevented by few factors for this we need another mnemonic
CESSATION of RACe
CESSATION of R=CESSATION of Respiration
A=Aryepiglottic fold constriction
C=Cords Closure(both true and false Cords)
e=epiglottis (why e is not E this is because epiglottis role is extremely minimal in this task of preventing food going into larynx)
You also must be aware of the fact that Deglutition has got 3 stages..
1.ORAL phase
2.PHARYNGEAL phase
3. ESOPHAGEAL PHASE
Now first we must understand that when food goes from oral cavity to pharynx regurgitation back to oral cavity is prevented... similarly when food goes from pharynx to esophagus regurgitation from esophagus to pharynx is prevented... when food enters from esophagus to stomach regurgitation from stomach to esophagus is prevented....
This is extremely easy we don't even need a mind to understand this or to remember this its like Class 1 stuff...
Our first mnemonic is about the mechanisms which prevent the reflux of bolus from Stomach to Esophagus...
TONE AMPlifier
TONE= TONE of GE sphincter (GE=Gastroesophageal sphincter)
A=Angle (esophagus gastric angle)
M=Mucosal folds at lower end of esophagus
P=Pinch cock effect of diaphragm , Pressure {negative intrathoracic and positive intraabdominal}
How the reflux from esophagus to pharynx is prevented it very easy to understand.. Remember that Cricopharyngeus muscle is the point from where esophagus starts so this Cricopharyngeus muscle CONSTRICTION along with PERISTALSIS waves of esophageal muscles prevent the reflux...
Pharynx to to Oral cavity reflux is prevented by the TONGUE BASE( not the entire tongue).
The TONGUE BASE CONTRACTS as result of that the TONGUE BASE touches the SOFT PALATE and closes OROPHARYNGEAL ISTHMUS...
Now food bolus from pharynx can also go to other places like NASOPHARYNX ,LARYNX .... ENTRY to NASOPHARYNX is prevented by the contraction of SOFT PALATE against the PASSAVANT RIDGE... PASSAVANT RIDGE is part of posterior pharyngeal wall...
ENTRY to LARYNX is prevented by few factors for this we need another mnemonic
CESSATION of RACe
CESSATION of R=CESSATION of Respiration
A=Aryepiglottic fold constriction
C=Cords Closure(both true and false Cords)
e=epiglottis (why e is not E this is because epiglottis role is extremely minimal in this task of preventing food going into larynx)
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