. The American journal of anatomy . ndlymphatic spaces (^s, fig. 35) following it are far more extensivein length, especially those in the region of the left Cuvierian there are two long spindle-shaped spaces parallel to eachother, the shorter one of them being that portion of the anlageof the future mediastinal lymphatic vessel situated near the pointof its subsequent junction with the other, or longer space, whichrepresents an anlage of the left thoracic duct. In a 22 , a slightly older stage, all of the blind spaces of the pre-and post-cardinal divisions have become confl
. The American journal of anatomy . ndlymphatic spaces (^s, fig. 35) following it are far more extensivein length, especially those in the region of the left Cuvierian there are two long spindle-shaped spaces parallel to eachother, the shorter one of them being that portion of the anlageof the future mediastinal lymphatic vessel situated near the pointof its subsequent junction with the other, or longer space, whichrepresents an anlage of the left thoracic duct. In a 22 , a slightly older stage, all of the blind spaces of the pre-and post-cardinal divisions have become confluent to form theuninterruped duct and its mediastinal tributary. (C) Supracardinal division. In the third division of the thor-acic duct area there may be recognized an anterior and a posteriorhalf, those regions, respectively, in which the duct-anlage duringits initial development is associated with the periaortic (6c, ) and the posterior supracardinal [6c, fig. 4) veno-lymphatics. THORACIC DUCT DEVELOPMENT IN THE PIG 445 12d. 4 I = 1 **/ 6c 13 Fig. 18 Transverse section through the region of the mesonephroi in a 21 embryo (series 103, slide 32, section 9), X 200. 4, lymphatic spaces or dis-continuous thoracic duct anlagen forming near or against the periaortic veno-lymphatics {6c); 4a, potential lymphatic spaces; 8, dorsal segmental vein; 12d, 12s,right and left supracardinal veins; IS, aorta. In series 103 (21 mm.) is foreshadowed the decadence of theperiaortic veno-lymphatics and the transference of supremacy totheir successors. Frequently throughout their course the veno-lymphatic channels have lost their former fullness and their endo-thelium has been thrown into a slightly wavy and uneven contour,this being especially true of that side of the plexus facing theaorta where these areas of weakness are more abundant and accen-tuated. Coexistent with this condition is an incipient vacuolation 446 OTTO F. KAMPMEIER of the mesenchyme by which large and small fissure
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
