88 



ANATOMY OF THE DOMESTIC FOWL 



Relations. Internally with the trachea, and externally with the 

 skin and other integument. 



FIG. 20. The anterior pectoral region, i, Sterno-trachealis. 2, Tracheo- 

 lateralis. 3, Broncho-trachealis brevis. 4, Costal process of sternum. 5, Right 

 and left carotid converging and occupying same sheath at 6. 7, The heart 

 showing branches of coronary artery. 8, Cervical air-sac. 9, Left brachio- 

 cephalic artery. 10, Right brachio-cephalic artery, n, Trachea. 12, Inferior 

 larynx. 13, Subclavian artery. 14, Carotid trunk. 15, Internal thoracic 

 artery. i6,|Thyroid gland. 17, Anterior vena cava. 18, Auricular appendage. 



FIG. 21. The inferior tracheal region, i, Bronchialis anticus. 2, Bronchialis 

 posticus. 3, Broncho-trachealis posticus. 4, Broncho-trachealis anticus. 



Action. A tensor of the true or inferior larynx. 

 Broncho-trachealis Anticus (Fig. 21, No, 4). Location.- Anterior 

 portion of the inferior extremity of the trachea. 



