THE LYMPH VESSELS AND GLANDS 



625 



may lie between the aorta and the left l)ranch of the pulmonary artery. These 

 glands are often j^igmented. Other small nodes are situated on the bronchi within 

 the lungs. 



The posterior mediastinal lymph glands comprise two or three of large size 

 placed along the ilorsal wall of the a^sophagus. There may be a single gland 

 about eight inches (ca. 20 cm.) long, the anterior half of which lies on the oesoph- 

 agus (Fig. 289).' A small gland is situated in the acute angle formed by the 

 posterior vena cava and the diaphragm. 



A single axillary lymph gland is situated on the distal part of the teres major 

 on the course of the vein fioiii \\iv latissimus dorsi. 



The lumbar lymph glands form an irregular series scattered along the abdom- 

 inal aorta ami j)osterior vena. A bean-shaped renal lymph gland occurs at the 

 hilus of each kidney. Haemolymph glands occur along the course of the aorta. 



Fig. 479. — Intestine of Ox, Spread Out. 

 Ca, Cacum; C, colon; D, duodenum; //, ileum; J, jejunum; R, rectum; m, mesenteric lymph glands. (After 



Edelmann.) 



The internal iliac lymph glands comprise a group of five or six at the termi- 

 nation of the aorta and the origin of the vena cava. A discoid gland, two inches 

 or more in diameter, occurs near the side of the pelvic inlet at the angle of diver- 

 gence of the circumflex iliac artery from the external iliac. A small gland is 

 sometimes found at the origin of the prepubic artery. 



The external iliac lymph glands number commonly two on either side, and are 

 situated near the point of the hip in front of the anterior branch of the circumflex 

 iliac artery. 



The superficial inguinal lymph glands are situated centrally below the prepubic 

 tendon and in the narrow space between the origins of the graciles. In the male 

 there are usually two or three on either side of the penis behind the sigmoid flexure. 

 In the cow they are supramammary, i. e., are situated above the posterior margin 



' When enlarged, as is often the case in tuberculosis, this gland frequently causes difficulty 

 in swallowing and in rumination and produces chronic or recurrent bloating. 

 40 



