THE LYMPHATIC SYSTEM 



741 



They are related deeply to the rectus capitis ventralis major and are covered by the 

 cleido-mastoideus . 



The middle cervical lymph glands form a group on the brachiocephalicus 

 on the course of the external jugular vein. Other small nodes are present in the 

 fat around the trachea. 



The prescapular lymph glands are situated at the anterior border of the an- 

 terior deep pectoral muscle, under cover of the trapezius and omo-transversarius. 



The posterior cervical or prepectoral lymph glands are reddish in color and 

 usually three in number. The largest is placed centrally under the trachea; the 

 others are situated on the brachial vessels as they turn arounii the first rib. 



Fig. 611. — Stomach and Part of Intestine of Pig, Spread Out. 



a, Pyloric part of stomach; b, duodenum; c, jejunum; d, ceecum; e, f, colon; g, pancreas: h, epiploic foramen; 



i, portal vein: fc, hepatic lymph glands; Z, gastric lymph glands; 771, oesophagus. (After Edelmann.) 



The axillary lymph glands are usually absent, but very small nodes may be 

 found near the insertion of the latissimus dorsi. Cubital glands are not present. 



The thoracic lymph glands comprise the following: 



(1) A sternal lymph gland of relatively large size lies on the first segment of the 

 sternum. (2) The mediastinal lymph glands include: a number of small reddish 

 nodes in the fat along the dorsal surface of the aorta; a gland on the left side of the 

 trachea in front of the aortic arch ; a gland on the aorta where it is crossed by the 

 vena hemiazygos; two or three glands in the posterior mediastinum along the 

 ventral surface of the aorta; several glands along the ventral surface of the trachea. 

 (3) The bronchial l3miph glands include one on the bifurcation of the trachea and 

 another at the apical bronchus of the right lung. 



