. The elasmobranch fishes. Chondrichthyes. A B rig. 191. Cerebral veins. (From Kex.) A. Scyllium catulus. B. Eaja asterias. , anterior cerebral vein; my., myelonal vein; , posterior cerebral vein. enters the cartilage in the posteroventral region of the capsule it is joined by the orbitonasal () or anterior facial vein (, fig. 190), which serves to connect the veins under discussion wath the orbital sinus {, fig. 190). The nasomaxillary vein next emerges from the nasal cartilage just laterad of the point where the maxillary nerve first passes under the basal fenestra
. The elasmobranch fishes. Chondrichthyes. A B rig. 191. Cerebral veins. (From Kex.) A. Scyllium catulus. B. Eaja asterias. , anterior cerebral vein; my., myelonal vein; , posterior cerebral vein. enters the cartilage in the posteroventral region of the capsule it is joined by the orbitonasal () or anterior facial vein (, fig. 190), which serves to connect the veins under discussion wath the orbital sinus {, fig. 190). The nasomaxillary vein next emerges from the nasal cartilage just laterad of the point where the maxillary nerve first passes under the basal fenestra (fn., fig. 2, Wells, 1917). Here it receives twigs from the skin and tissue outside of the capsule, and a subrostral vessel () from the tip of the snout. In the posterior part of its course the nasomaxillary vein swings mediad in front of the superior labialis muscle (Us.) to join its mate from the opposite side to form a dorsal sinus (s.). From the sinus (s.) the buccopharyngeal veins {, fig. 192b) lead backward, and at the basal angle of the cranium, right and left vessels swing outward following the margin of the orbits. At the postorbital process each buccopharyngeal receives one or two lateral tributaries from the sides of the upper jaw, and then right and left vessels take an almost parallel course posteriorly finally to empty into the anterior cardinal sinus. The anterior cerebral vein (, fig. 191a) , which, as we said above, enters the orbit as the principal vein from the anterior part of the brain, may vary. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Daniel, J. Frank (John Franklin), 1873-1942. Berkeley,Calif. , University of California press
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