2 4 o ZOOTOMY. 



jugular .receives veins from the crop, the sides of the neck, and the 

 lymphatic glands ( 251), and at the level of the posterior end of the 

 latter, the vertebral vein (vr) enters it. 



250. The cervical portion of the vagus, a stout nerve 

 accompanying the jugular. 



251. The cervical lymphatic glands, paired, reddish, 

 ovoidal bodies, situated one on each side of the root of the 

 neck : each receives an artery. from the common carotid, and 

 contributes a vein to the jugular. 



XXXVII. Carefully dissect away the liver substance from that part 

 of the postcaval which is embedded in it, and make out : 



252. The right and left hepatic veins (h.v) t of which the latter is 

 the larger, entering the postcaval just before its exit from the liver. 



253. The epigastric vein (epg) ( 180), entering the left hepatic vein 

 near its junction with the postcaval. 



XXXVI II. Ligature the postcaval between the liver 

 and the heart, and cut it through to the distal side 

 of the ligature : turn the apex of the heart forwards 

 and make out : 



254. The left precaval (Fig. 56, /./?r) curving round the 

 dorsal side of the left auricle to reach. the right auricle. 



255. The pulmonary veins (p.v\ entering the left 

 auricle in the U-shaped space between the two precavals : 

 sometimes there is a single trunk from each lung, sometimes 

 there are two from each, uniting before they enter the 

 auricle. 



256. The course of the right and left pulmonary 

 arteries (r.p.a, l.p.a) ( 242) to the lungs. 



257. The arch of the aorta (a.ao) ( 241), curving 

 over the right bronchus to reach the middle dorsal line, 

 when it becomes the dorsal aorta ( 221, Fig. 54, d.ao). 



XXXIX. Cut through the precavals, the pulmonary 

 arteries and veins, and the aorta, and remove the 

 heart from the body : place it in a dissecting dish 



