Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 THE BRAIN. 139 In the Angler (Lophius piscatorius, a Teleostean) there is also a superficial layer of enormous nerve-cells (about 200 in number) behind the calamus scrip- torius of the sinus rhomboidalis, filling up the dorsal fissure of the spinal cord for a certain distance : their discoverer, G. Fritsch, calls them'lobi nervi lateralis.' The axis fibres arising from these cells accompany the trigeminal and vagus, but do not go to electric organs, which are entirely wanti
Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 THE BRAIN. 139 In the Angler (Lophius piscatorius, a Teleostean) there is also a superficial layer of enormous nerve-cells (about 200 in number) behind the calamus scrip- torius of the sinus rhomboidalis, filling up the dorsal fissure of the spinal cord for a certain distance : their discoverer, G. Fritsch, calls them'lobi nervi lateralis.' The axis fibres arising from these cells accompany the trigeminal and vagus, but do not go to electric organs, which are entirely wanting in Lophius, but to the integumentary sense-organs, which are enormously developed in this Fish, and also to the ' lure/' The similarity in position of these nerve centres to the electric lobes of Torpedo, however, deserves notice. Fir;. 112.—BRAIN OF Myliobatts aquila, in situ. (From the ventral side.) (After Bohon.) /, olfactory, //, optic, ///, oculomotor, IV, trochlear, J~, trigeminal, VI, abducent, VII, facial, VIII, auditory, IX, glossopharyngeal, and X, vagus nerves ; VH, prosencephalon ; H, HS, hypophysis and infumlibulum ; UL, lobi inferiores ; 8v, saccus vasculosus ; Ctr, transverse commissure ; GcJi, auditory capsule ; Jl~, vertebral column ; A', spinal cord. Teleostei.—The type of brain found in Teleosteans is also specialised, and restricted to the members of this order. As is the case in nearly all Fishes, the brain by no means fills the cranial cavity, as already mentioned in the description of the brain-membranes, and as a rule it is separated from the roof of the skull by a greater or less amount of a lymph-like fluid. The form of the brain in Teleostei varies greatly, more by far than in any other Vertebrate group. It is therefore difficult to give a general description of it, and only the following essential points can be mentioned here. It never attains to so large a relative size as does that of Elas- mobranchs. The peripheral region, as already me
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