258 
(c) 

ANATOMY OF THE RABBIT. 
passes almost directly backward, crossing the ventral surface 
of the right subclavian artery, and enters the anterior portion 
of the right atrium. The left vessel crosses both the left 
subclavian artery and the arch of the aorta, reaching the 
right atrium from the dorsal surface of the heart. 
The vagus nerve. On the right side the nerve crosses the 
ventral surface of the subclavian artery, passing dorsad 
to the wall of the oeso- 
phagus. It gives off 
the recurrent nerve 
(n. recurrens), the lat- 
ter curving around the 
subclavian artery and 
passing forward along 
the side of the trachea 
to the larynx. On the 
left side the vagus 
passes between Ae 
arch of the aorta and 
the base of the heart 
to the ventrolateral 
wall of the oesophagus. 
The recurrent. nepve 
passes forward on the 
dorsal side of the arch. 
(d) Theramus cardiacus 
Fic. 82. Planofthe venous and lymphatic 
trunks of the anterior portion of the body, After of the Vagus. In front 
McCiure and Silvester. | : 
a., azygos vein; ao., aorta; c.s., left superior of the subclavian 
caval vein; d.th., thoracic duct; j.e., j.i., and ° 
j.tr., external, internal and transverse jugular artery the nerve 1s at 
veins; 
(e) 
., left subclavian vein; tr.s., transverse 
scapular vein, 
first closely associated 
with the vagus trunk, 
lying on its medial side. On the right side it passes to the 
dorsal surface of the subclavian, and on the left to the 
dorsal surface of the aortic arch. It ends in the cardiac 
plexus (plexus cardiacus), a network of sympathetic nerves 
lying between the aortic arch and the pulmonary artery. 
The phrenic nerve (n. phrenicus) is a stout cord arising 
chiefly from the fourth cervical spinal nerve. That of the 
