862 THE VASCULAR SYSTEM. 
upwards from the receptaculum, the thoracic duct traverses the aortic opening 
of the diaphragm and enters the posterior mediastinum, through which it ascends, 
lying in front of the vertebral column and to the right of the middle line, to the 
level of the fifth dorsal vertebra ; 1t then crosses somewhat abruptly from the right 
to the left of the median plane, and ascends through the superior mediastinum to 
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Bronchial 
_ lymphatic 
vessel 
L- 
Vena t 
azygos 
miuinor 
superior 
_Aorta 
Vena azygos major 
Vena azygos minor 
inferior 
Descending thoracic 
lymphatic trunk 
(Esophagus 
Descending thoracic 
lymphatic trunk 
_ Inferior phrenic 
artery 
Thoracic duct Q 
~Suprarenal body 
Receptaculum chyli - 
— Ceeliae axis 
Superior mesenteric 
~ artery 
—_Common intestinal 
lymphatie trunk 
~~Renal artery 
Suprarenal body 
Inferior vena cava 
Right renal artery 
‘ 7 Renal vein 
Left renal vein 
Lumbar veins 
Common lumbar 
lymphatic trunks 
Fic. 592.—THe TuHoracic Duct AND 1Ts TRIBUTARIES. 
the root of the neck, where it turns outwards, between the vertebral and common 
carotid arteries, to terminate at the inner border of the scalenus anticus by 
joining the commencement of the left innominate vein. 
Length and diameter.—The total leneth of the duct averages about 18 inches 
(45 cm.). It is dilated both at its origin and termination. As a rule it is | 
narrowest opposite the fifth dorsal vertebra, but its calibre is very variable, and 
