. The elasmobranch fishes . Fig. 183. Danielian sinus, Hci^ianchus maculatus. (Eiith Conrad, orig.) ap., apertures connecting anterior cardinal () and Danielian sinuses () ; 1)8., blind sacs leading from Danielian sinus; , entrance to duct of Cuvier; nu., nutrient vessels; , posiorbital process. trance of the hyoidean vein. Other openings (aj).) between the anterior cardi- nal and Danielian sinuses, posterior to this point, are arranged more or less segmentally as may be seen by lifting up the vagus nerve. The inferior jugular vein (, fig. 184) drains the ventral area of
. The elasmobranch fishes . Fig. 183. Danielian sinus, Hci^ianchus maculatus. (Eiith Conrad, orig.) ap., apertures connecting anterior cardinal () and Danielian sinuses () ; 1)8., blind sacs leading from Danielian sinus; , entrance to duct of Cuvier; nu., nutrient vessels; , posiorbital process. trance of the hyoidean vein. Other openings (aj).) between the anterior cardi- nal and Danielian sinuses, posterior to this point, are arranged more or less segmentally as may be seen by lifting up the vagus nerve. The inferior jugular vein (, fig. 184) drains the ventral area of the phar- ynx and extends as an enlarged vein or sinus back to the heart. Anteriorly it receives a tributary from the symphysis of the lower jaw (smt.) and another from the thyroid region (). It next receives the hyoidean vein or sinus () and. at regular intervals back of this, ventral nutrients (nv.) which are continuous with the dorsal nutrients of the anterior cardinal. Notwithstand- ing the fact that it receives veins from all the holobranchs, the inferior jugu- lar decreases in caliber in its course backward. Near its termination it curves laterally and then passes backward to enter the duct of Cuvier just mediad of the entrance of the subclavian vein (fig. 188). VEINS OF TAIL The caudal vein (, fig. 185) passes forward in the haemal canal of the tail, and back of the cloaca divides into the renal portal veins ().). It receives branches from the dorsal and posterior ventral cutaneous veins (fig. 189) and numerous segmental veins from the tail; other segmentals join the renal portals as they pass along the dorsolateral margins of the kidney. The ventral rami of the segmental veins receive the blood from the musculature of the ventral lobe of the caudal fin, and each dorsal ramus collects venous blood from dorsal musculature and from the spinal cord. The renals finally break up into a net in the tissues of the kidney.
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