. The American journal of anatomy. atrophied and thecephalic portion of the right duct would not connect with thethoracic duct and would persist only as the right lymphatic duct(fig. 9). It should be noted that Types 2 and 3, 4 and 5, 6 and 7, 8 and9 are respectively the reverse of one another in that those channelswhich persist in one atrophy in the other and vice versa. Group I Winslow (66), Cruickshank (90), Sommering (92), andHommel (37) describe bilaterally symmetrical thoracic thoracic ducts start in the abdominal cavity as two ductswhich pass cephalad through the thorax, one o
. The American journal of anatomy. atrophied and thecephalic portion of the right duct would not connect with thethoracic duct and would persist only as the right lymphatic duct(fig. 9). It should be noted that Types 2 and 3, 4 and 5, 6 and 7, 8 and9 are respectively the reverse of one another in that those channelswhich persist in one atrophy in the other and vice versa. Group I Winslow (66), Cruickshank (90), Sommering (92), andHommel (37) describe bilaterally symmetrical thoracic thoracic ducts start in the abdominal cavity as two ductswhich pass cephalad through the thorax, one opening into thevenous system of the left side and the other into the venous systemof the right side. The right duct lies to the right of the aorta andthe left duct on the left side of the aorta. These two ducts arejoined together by numerous cross anastomoses. I found noducts of this type. It is clearly evident that the thoracic ductsdescribed by the above investigators belong to Type 1 (fig. 1). THORACIC DUCT IN MAN 217 Left Duct. Left Duct Fig. o Type 5; schematic representation of thewhich might persist. Fig. 6 Type 6; schematic lepresentation of thewhich might persist. Fig. 7 Tjpe 7; schematic representation of thewhich might peisist. Fig. 8 Type 8; schematic representation of thewhich might persist. Fig. 9 Type 9; schematic representation of thewhich might persist. embryonic lyini:h channelsembryonic lym))h cliannelsembryonic lymph channelsembryonic lymph channelsembryonic lymph channels 218 HENRY K. DAVIS Croup II The thoracic ducts of this group (cases 1-6, figs. 10-15) beginin the abdominal cavity as two ducts which extend cephaladthrough the thorax. The right duct lies to the right of theaorta and the left duct to the left of the aorta. The right ductcrosses in the thorax at the level of the 4th thoracic vertebradorsal to the aorta to join the left duct forming a single trunkwhich empties into the venous system on the left side at the baseof the neck. The two ducts are
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