. The elasmobranch fishes. Chondrichthyes. Fig. 172. Cerebral arteries. A. Sqnalns sticMn. (E. H. Barbera, orig.) B. Cetorhinun. (From Carazzi.) C. Haja cJavata. (From Hyrtl.) , anterior cerebral artery; , spinalis artery; hs., basal artery; , internal carotid artery; , median cerebral; ml., myelonal artery; , posterior cerebral; tn., terminal nerve. 171a), which runs with the optic nerve to the eye. Each internal carotid then turns upward, as in Heptanchus, and divides into the three cerebral arteries which vary considerably in the different Elasmobranchs. The cerebral arter
. The elasmobranch fishes. Chondrichthyes. Fig. 172. Cerebral arteries. A. Sqnalns sticMn. (E. H. Barbera, orig.) B. Cetorhinun. (From Carazzi.) C. Haja cJavata. (From Hyrtl.) , anterior cerebral artery; , spinalis artery; hs., basal artery; , internal carotid artery; , median cerebral; ml., myelonal artery; , posterior cerebral; tn., terminal nerve. 171a), which runs with the optic nerve to the eye. Each internal carotid then turns upward, as in Heptanchus, and divides into the three cerebral arteries which vary considerably in the different Elasmobranchs. The cerebral arteries, consisting of an anterior, a median, and a posterior pair of arteries are, as we have seen in Heptanclms, derivatives of the right and left internal carotids. The anterior cerebral arteries {, fig. 172a) pass forward ventrally around the lobi inferiores of the brain and over the optic chiasma; in front of this, right and left arteries may be put into communica- tion by a cross-trunk. From here forward great variation ensues. In some types these arteries pass as single strands between the right and left divisions of the telencephalon. In others they extend forward as numerous branches {Heterodontus, rays). The median cerebrals () extend under the telen- cephalon and along the olfactory tracts as fairly simple vessels (Squalus. 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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