The Permanent Negative Pressure I 

 thai occur in the thorax \\ hen 

 una! is still in uter o, the In 

 first breath ii dram n the tl 

 1 u 1 1 <_ r ^ . to thai ili<- latter become 

 the air thai i> introduced into them 

 chea and bronchial tub 

 increased spj i ted in tl.. thorax 



thoracic <■■ This in itself, 1 ,f a 



subatmospheric pressure in the inti 

 come into play namely, the elsstic I 

 expansion will !>»■<•< mp I and, tl 

 lax t" its previous condition and 

 tu ten it and the thoracic wall. II • 

 measure when we conned a manomel ith tl 

 Throughoul life the lungs remain of small." all. 



and therefore to till the thoracic cavit; 

 l.->s distended and the elastic tisc 

 are, however, no1 the only Btructu 

 panded; all thin-walled ■ and viscera, Ii 

 gua, the aurich . must also b m< 



When the thoracic wall is punctured and the out 

 entry t<> the intrapleural diffei 



on the inner and outer :\^\>< the In 



ih.' postmortem <-'>u<liti<»!i on accounl 

 in the thoracic wall of a li\i: i» in 



luiiirs W ill ••\|>a iii. be< 



intrapleural space and n 

 the lungs. This absorption • 

 rapid; bul if the /"" umothorax t 



■ f..r any length of tim< . the 1' 

 panded again. 



The Greater Negative Pressure on Inspiration 

 rax becomes increased in ;i! : 

 suit thai i g] in the 



thin-walled structures in the I 



artieipi 

 entrance of outside air 



ter pull, or negate 

 [nstead "t" being •"> nun 1 1 

 now comes t.. be atxn e 10 



When anv obstru r *" 



