478 



OPEEATIONS ON THE EBSPIRATORY APPAEATUS. 



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

 demonstrated by studying the effect of its performance, and esti- 

 mating the reUef which immediately foUows, in some special cases 

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

 nently impendiag suffocation. It is performed in the middle of 

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



Fig. 520.— Traelieal Eegion. T, Trachea; A A, Stemo-Hyoideus and Thyroldeua MuB- 

 olea; S B, Sub-Scapulo-Hyoideua ; S M, Sterno-Maxillaris ; J, Jugular Vein. 



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

 formed by the diverging branches of the stemo-maxillary muscles 

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

 trachea is here merely covered by the subcutaneous band of the 

 sterno-hyoideus and stern o-thyroideus, and the whole is wrapped 



