4^^ 



ANGIOLOGY. 



liave a right and left, or double at its origin only ; or it may be 

 single at its origin, then bifid for a short distance, again forming 

 a single trunk ; it contains a few valves. 



The lymphatics, which form the afHuents of the thoracic duct, 

 may be divided into five groups, comprised within the following 

 divisions of the body : — 



Posterior rescion. | Thoracic viscera. 



Digestive viscera. 



Thoracic walls. 



Anterior region. 



Fio. 170. 



Thorax laid open on tho right side— the lungs being removed. 1, Part of posterior aorta ; 

 2, Trachea divided ; a a, Eight and left branches of origin of thoracic duct (double posteriorly in 

 this instance) ; 6, Point of union of the branches ; c c, Loops leaving and rejoining the duct ; 

 (i, Point of discharge of the duct ; e, Cervical lymphatic vessel ; e'. Its termination in the duct. 



POSTERIOR REGION. 



This embraces the lymphatics of the posterior extremity, pelvis, 

 abdominal walls, and organs of the pelvic region. They all 

 converge to a large group of glands, the sublumbar, presenting, 

 however, at dififerent parts of their passage,. other groups. We 

 note th6 following*! — 



The sublumbar glands occupy the sublumbar region, resting 

 in the angles formed by the bifurcation of the ix)sterior aorta. 



