. The elasmobranch fishes. Chondrichthyes. fo. VII po Fig. 192a. Veins dorsal to roof of cranium, Squalus sucMii. Fig. 192b. Veins in roof of buccal cavity, Squalus sucldii. , buccopharyngeal vein; , dorsolateral rostral vein; , dorsomedian rostral vein; fn., basal fenestra; fo. VII, exit of superficial ophthalmic nerve; Us., attachment, superior levator labialis muscle; , nasal aperture; , nasal capsule ; , nasomaxil- lary vein; , nasal vein; , orbitonasal (facial) vein; , parietal fossa; , post- orbital process; s., sinus; , supraorbital
. The elasmobranch fishes. Chondrichthyes. fo. VII po Fig. 192a. Veins dorsal to roof of cranium, Squalus sucMii. Fig. 192b. Veins in roof of buccal cavity, Squalus sucldii. , buccopharyngeal vein; , dorsolateral rostral vein; , dorsomedian rostral vein; fn., basal fenestra; fo. VII, exit of superficial ophthalmic nerve; Us., attachment, superior levator labialis muscle; , nasal aperture; , nasal capsule ; , nasomaxil- lary vein; , nasal vein; , orbitonasal (facial) vein; , parietal fossa; , post- orbital process; s., sinus; , supraorbital vein; , subrostral vein. the anterior cerebral drains the olfactory lobe and tract, the second the whole of the ventral area back to the optic chiasma, and the third the whole of the remaining dorsal region anterior to the cerebellum. It is through the last- named vessel that the roof of the third ventricle is drained. The anterior cardinal sinus (fig. 190) receives the hyoidean vein and the nutrients (not shown) from all the holobranchs. These nutrients, as in Hep- tanchus, are continuous with ventral nutrients. The posterior cerebrals (, fig. 191) from the brain enter the anterior cardinal sinus. In a type like Scyllhim (fig. 191a) they collect the blood from the cerebellum and medulla and pass it posteriorly in large right and left dorsal veins through the foramina with the vagus nerves. In Raja asterias (fig. 191b) the posterior cerebral is usually a single vessel. Continuing pos-. 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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