Bulletin of the Bureau of Fisheries . heupper lip and membranesof this region, and finallypierces the premaxilla as thesuperior dental artery (37). The internal carotid wr-it ry and its hriiiii-Jii s (tig. IB,pi. i). The internal carotidartery (25) runs mesad andslightly craniad until itreaches the median line, thendorsad for a short distance,accompanied by the internalcarotid of the opposite which it anastomoses toform a single median vessel,the carotis interna impar(!). The latter continuesdorsad, passing through amedian foramen in the basi-sphenoid, and on the ventralsurface of th
Bulletin of the Bureau of Fisheries . heupper lip and membranesof this region, and finallypierces the premaxilla as thesuperior dental artery (37). The internal carotid wr-it ry and its hriiiii-Jii s (tig. IB,pi. i). The internal carotidartery (25) runs mesad andslightly craniad until itreaches the median line, thendorsad for a short distance,accompanied by the internalcarotid of the opposite which it anastomoses toform a single median vessel,the carotis interna impar(!). The latter continuesdorsad, passing through amedian foramen in the basi-sphenoid, and on the ventralsurface of the hypophysisdivides into two pairs of vessels, the anterior and posterior cerebral arteries. The anterior cerebral arteries run craniad, side by side, to supply the telenceph-alon. The posterior vessels curve laterad and caudad over the Iobi inferiores to joinagain in the median line on the ventral surface of the medulla near its cranial this point they give off anterior and posterior branches, the former supplying the. Fig. 11.—Cranial portion of the arterial system in tin: Bounder I / imandafer-ruginea). Ventral aspect, natural size. On the right side the ventral endsof the efferent branchial arteries and their branches are reflected so as tobring them into one plane. 100 BULLETIN OF THE BUREAU OF FISHERIES. greater portion of the brain, while the latter run caudad, on the ventral surface ofthe medulla, to reach the spinal cord. On the sides of the lobi inferiors the posteriorcerebral arteries usually give off several small branches, one or two of which supplythe ear. In some teleosts (Opsanus and Limanda, tigs. 10 and 11) the internal carotidsjoin near their points of origin to form an arteria carotis interna impar; in others(Leptocephahis, tig. 2) union does not take place until thej reach the base of thebrain. The position and constant occurrence of the arteria carotis impar of teleostssuggests its homology with the cranial end of the primitive dorsal aorta (Ayres
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
