. The elasmobranch fishes . Fig. 152. Arterial branches of first efferent-collector, Heptanchus macuJatus. (Marie Weldt, orig.) , anterior cerebral; , arteria spinalis; }, first branchial efferent; }, paired dorsal aorta; , dorsal aorta; , hyoidean efferent; , internal carotid; , median cerebral; ns., nasal artery; , ophthalmica magna; or., orbital artery; , posterior cerebral; ps., pseudobranchial artery; , ramus anastomoticus; rs., rostral artery; sg., segmental artery. cardial roof as the two large pericardial arteries (^^c). The pericardials may
. The elasmobranch fishes . Fig. 152. Arterial branches of first efferent-collector, Heptanchus macuJatus. (Marie Weldt, orig.) , anterior cerebral; , arteria spinalis; }, first branchial efferent; }, paired dorsal aorta; , dorsal aorta; , hyoidean efferent; , internal carotid; , median cerebral; ns., nasal artery; , ophthalmica magna; or., orbital artery; , posterior cerebral; ps., pseudobranchial artery; , ramus anastomoticus; rs., rostral artery; sg., segmental artery. cardial roof as the two large pericardial arteries (^^c). The pericardials may be of essentially the same size or the right one may be the better developed (see fig. 154, ). The epigastric artery (epg., fig. 154), which supplies branches to the oesophagus and the stomach, is a branch off of the pericardial or is the direct continuation of the right one. A large vessel is given off from the median hypobranchial between commis- sures two and three, or three and four, which passes to the midventral line and joins a similar artery from the opposite side. This united trunk extends poste- riorly, and at the sixth commissural divides into the right and left coracoid arteries (), which join the subclavian arteries. Similarly, near the sixth commissural, an artery arises from the median hypobranchial on each side to pass posteriorly and toward the midventral line. This artery, however, does not reach or fuse with its fellow from the opposite side, but continues as the coronary artery (, figs. 153 and 150) to the heart. In Heptanchus maculatus the left coronary (, fig. 150a) runs along the dorsal and left side of the conus arteriosus, supi^lying it and the dorsal side of
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