452 



ANGIOLOGT. 



"have 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 affluents of the thoracic duct, 

 may be divided into five groups, comprised within the following 

 divisions of the body : — 



Posterior region. I Thoracic viscera. 



Digestive viscera. I Thoracic walls. 



Anteiior region. 



Fiu. 170. 



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



2, Trachea divided ; o a, Kight 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 ; 



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



POSTERIOR REGION. 



This embraces tlie lymphatics of the posterior extremity, pelvis, 

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

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

 however, at different parts of their passage,. other groups. "We 

 note the followins: : — 



Sublumbar. 

 Deep inguinal. 

 Superficial inguinal. 



Pophteal. 



Iliac. 



Precrural. 



The sublumbar glands occupy the sublumbar region, resting 

 in the angles formed by the bifurcation of the posterior aorta. 



