478 



OPERATIONS ON THE RESPIEATOKY APPARATUS. 



The importance of the operation, with its utility, is readily 

 demonstrated by studying the e£fect of its performance, and esti- 

 mating the relief which immediately follows, in some special cases 

 of ailment or accidents, complicated with the danger of immi- 

 nently impending suffocation. It is performed in the middle of 

 the inferior border of the neck, in that portion where the trachea 



'ii|;^y; 



Pig. 520.— Tracheal Region. T, Trachea; A A, Sterno-Hyoideus and Thyroideus Mus- 

 clee; S H, Sub-Scapulo-Hyoideus ; if M, Sterno-Maxillaris ; J, Jugular Vein. 



being most subcutaneous, can be readily felt, in the lozenge 

 formed by the diverging branches of the stemo-maxillaiy muscles 

 below, and the two converging sub-scapulo hyoideus above. The 

 trachea is here merely covered by the subcutaneous band of the 

 sterno-hyciaeus and sterno-thyroideus, and tLe whole is wrapped 



