. The American journal of anatomy. halic end of the right ductwith the left duct. The reduction in caliber of the left ductand the decrease in the numl)er of cross anastomoses point to astage in the atrophy of the left duct. There is no cisterna chylipresent. It is represented by a plexus of lymphatic type of duct occurred in 1 case out of 22, or in percent (fig. 2). Division C. In cases 3 and 4 (figs. 12-13), in cases 5 andG (figs. 14-15) there is a partial doubling of the caudal portionof the thoracic duct. In each case the caudal portion of the rightduct is complete but t
. The American journal of anatomy. halic end of the right ductwith the left duct. The reduction in caliber of the left ductand the decrease in the numl)er of cross anastomoses point to astage in the atrophy of the left duct. There is no cisterna chylipresent. It is represented by a plexus of lymphatic type of duct occurred in 1 case out of 22, or in percent (fig. 2). Division C. In cases 3 and 4 (figs. 12-13), in cases 5 andG (figs. 14-15) there is a partial doubling of the caudal portionof the thoracic duct. In each case the caudal portion of the rightduct is complete but the left duct has partially atrophied. In case 3 (fig. 12) the thoracic duct begins in the abdominalcavity as two ducts which pass cephalad into the thorax. Theright duct lies to the right of the aorta and is placed betweenthe aorta and vena azygos major. It begins to incline to theleft opposite the inferior level of the body of the 4th thoracic InternalLeft Internal Jugular Vein /Jugular Trunk InternalJugular Trunk SubclavianTrunk. LymphGlands Collaterals Collatera Left Lumbar Lymphatics Right Lumbar Lymphatics Fig. 12 Type 1; thoracic duct in a male white subject, age 72. Note theincomplete duct of the left side. Fig. 13 Type 1; thoracic duct in a female white subject, age 69. Note theincomplete duct of the left side and the abundant cross anastomoses between itand the duct on the right side. 221 222 HENRY K. DAVIS vertebra and crossing dorsal to the aorta reaches the left sidewhere it continues its course cephalad to open into the angulusvenosus formed by the junction of the left internal jugular andleft subclavian veins. The right duct lies to the right of theaorta. It passes up into the thorax from the abdominal cavityand ends at the lower level of the 7th thoracic vertebra. Theportion cephalad of this has atrophied. The two ducts arejoined together by numerous cross anastomoses. There is nocisterna chyli present. It is represented by a plexus of lymphaticvessels. In figure
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