. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. CIRCULATORY SYSTEM. i Near the junction of pre- and postcardinals on either side numerous small diverticula are given off from the lateral side of these veins (fig. 309, A). These diverticula unite with each other, forming small tubes parallel to the parent vessels and united to them for a time at numerous points where the budding took place. Later these connex- ions are lost and the tubes are separated from the veins (fig. 309, B] forming an anterior cephalic duct, extending forward, parallel to the jugular ve
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. CIRCULATORY SYSTEM. i Near the junction of pre- and postcardinals on either side numerous small diverticula are given off from the lateral side of these veins (fig. 309, A). These diverticula unite with each other, forming small tubes parallel to the parent vessels and united to them for a time at numerous points where the budding took place. Later these connex- ions are lost and the tubes are separated from the veins (fig. 309, B] forming an anterior cephalic duct, extending forward, parallel to the jugular vein; an ulnar lymphatic duct destined to grow into the fore limb; and, a little later, a thoracic duct grows back, parallel to the. FIG. —Early development of the lymph vessels in the cat, after McClure and Huntington. A, in mm. embryo; B, in mm. embryo; C, definitive stage; D, diagram of developing diverticula of chick which are to form lymph heart, based on Sala. ac, anterior cardinal vein; c 1-5, coccygeal veins; cd, Cuverian duct; cv, cephalic vein; dls, dorsal veno-lymphatic sinus; ej, i], external and internal jugulars; prc, precava; th, thoracic duct; ul, primitive ulnar lymphatic; uva, anlage of ulnar vein; vis, ventral veno-lymphatic sinus; 1-7, segmental vessels; lymphatic-forming tissue stippled. postcardinal vein. All of these vessels are united near their point of origin by a large sinus, the jugular lymph sac (fig. 309, C). Later the lymph sac reestablishes communication at one or two points in the subclavian-jugular region with the vein. The conditions at the posterior part of the body are less certainly known (fig. 309, D}. In this region a cistern of chyle (a mesenterial lymph sac) and a posterior lymph sac develop in close connexion with the postcava in the region of the nephridial organs, and it is pos- sible that a portion of the thoracic duct grows forward from the cis- tern of chyle, while other vessels grow into other regions. Later the pri
Size: 1930px × 1295px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
