SWALLOWING. 



Ill 



the epiglottis, which overhangs the aperture leading to 

 the windpipe, c, is also shut 

 down. Therefore, when the 

 muscles of the pharynx con- 

 tract and press on the food, 

 the only way it can go is 

 into the gullet, b. Occasion- 

 ally a morsel '* goes the 

 wrong way," and gets into 

 the air-passage, causing a fit 

 of coughing which drives it 

 back into the pharynx. The 

 things which we swallow are 

 hurried through the pha- 

 rynx very fast, so as to get 

 it clear, and enable us to 

 breathe again. 



3. The Passage of Food and 

 Drink along the Gullet or oeso- 

 phagus, is slow. A mouthful 

 of food or drink when it has 



. j 4.u i, j gullet and larynx, as exposed by a sec- 



entered the OeSOphagUS does fion, a little to the left of the middle 

 , , , ^. , of the head, a, vertebral column; 6, 



not drop dOWn that tube mtO gullet; <r, windpipe; d, larynx; e, epi- 

 , glottis; f. soft palate; g, opening of 



the Stomach, like a brick Eustachian tube; the letters e,f,g are 



placed in the pharynx; k, tongue; /, 



tailing down a Chimney, but hard palate; m, the sphenoid bone on 



the base of the skull; , the fore part 



is Seized by the muscular of the cranial cavity; o, p* q, the 

 J turbinate bones of the outer side of the 



rings in the COat of the gul- left nostril-chamber. 



let, which contract one after another and push it along. 



into the nose ? Into the windpipe ? What does it enter when forced 

 out of the pharynx ? What is meant when a morsel of food is said to 

 have gone the wrong way ? Why is food sent quickly through the 

 pharynx? 



3. How do food and drink pass along the gullet ? Illustrate. 



