342 



THE SPINAL ACCESSORY NERVE. 



Fig. 171. 



ILLUSTRATION OF PULMONARY GANGLIA. 



Fig. 172. 



Fig. 171 : 1,1, pulmonary ganglia ; 2, median anas- 

 tomoses of these ganglia at the posterior face of the 

 trachea, and origin of the bronchi ; 3, left laryngeal 

 nerve, aiding to form the bronchial plexus ; 4, anas- 

 tomoses of the two pneumogastrics on the posterior 



Pulmonary ganglia. faCC of the O3SOphagUS. 

 ILLUSTRATION OF INFERIOR LARYNGEALS, ANTERIOR PULMONARY, AND CARDIAC PLEXUS. 



Fig. 172, 1, 1, pneumogastric ; 2, 2, superior laryngeal; 3, 3, exter- 

 nal laryngeal ; 4, superior car- 

 diac nerve; 5, 5, middle cardiac 

 nerves ; 6, inferior cardiacs ; 7, 

 cardiac ganglion and plexus ; 8, 8, 

 nerves from this plexus surround- 

 ing the coronary plexus ; 9, 9, an- 

 terior pulmonary plexus ; 10, 10, 

 inferior laryngeal-: the left em- 

 bracing the arch of the aorta, the 

 right the subclavian artery, both 

 go to the posterior face of the 

 larynx; 11, tracheal branches; 

 A, pulmonary artery ; B, its left 

 branch ; C, its right branch ; D, 

 arch of the aorta ; E, fibrous cord 

 arising from obliteration of the 

 ductus arteriosus ; F, left subclavian ; G, G, left primitive carotid ; H, 

 brachio-cephalic trunk, cut to show cardiac nerves ; I, vena cava supe- 

 rior ; K, left coronary artery and vein ; L, right coronary artery and 

 vein , #, os hyoides ; 5, projecting portion of the larynx ; <?, trachea ; d, 

 thyro-hyoid muscle ; e, c, crico-thyroid ; /*, /*, scalenus anticus ; #, <?, 

 thyroid body ; A, A, diaphragm ; ?, ?", pericardium, cut away. 



OF THE ELEVENTH PAIR, OR SPINAL ACCESSORY NERVE. 



The spinal accessory arises by several filaments from the side of the 

 The eleventh s P ma ^ cord, as low as the fifth or sixth cervical nerve. In 

 pair, or spinal its upward course it communicates with the posterior roots 

 of the first cervical. It then divides into two branches, the 

 smaller joining the pneumogastric, the main trunk passing onward, and 

 being eventually distributed to the trapezius muscle, and also furnishing 

 supplies to the sterno-mastoid. 



The spinal accessory is a motor nerve, as appears from the usual evi- 



The inferior laryngeals. 



