Proceedings of the section of sciences - DWC - KNAW

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( 30l ) pole of the radix spinalis trigemini, from wbich it can no longer be distinguished in the more caudal planes. In Teleostei, especially lophius piscatorius, the case is more simpIe. The radix mesencephalica is 1ess compact here; it is fornled by several, 4: or 5, thin, medullary bundIes, from which, at the point Fig. 9. Lophius piscatorius. - 42 - whel'e the sens. trigem.l'oot enters, only loosely connected fibres separate, to leave the oblongata dOl'sally from the entering sens. nel've or between the most dOl'sal fibres. Several (4) sections furthel' distally the nerv. V mot. also leaves the brain stem; this toa passes into the dorsal part of the here entering sens. V fibres, still ventrally to the mesene. quintus, and clearly separate from it (fig. 9). Further caudally nothing more is to be found of the radix mesencephalica. Amphibia. Accol'ding to PEDRO RAMON (l.c.) the cells of origin of the mesene. quintus of these animals lie in the tectum opticulll, close to the ependyma of the ventr. lob. opt., somewhat scatteL'ed laterally to and even 1'owul the vent. lob. opt.; thus in th is respect t hey rather l'esemble the condition in teleostei. The root-fibl'es run in the usual way distally, the majority of them first turn towal'ds the periphery in a cross plane where the trigeminus aJready enteL's. Here they l'emtlin "entral, and are accompanied in their tnrn by the motor V root, from whieh they are clearly separated (I'ana fig. 10). A small remnant of the radix meseneephalica pl'oeeeds caudally, on the same relative place as in scyllinm, and ean soon no longer be distinguished. Reptilia. Here, as regards the position of the elements of the 1arge-celled llueleus tecti different conditions are met with in representati\'es of the lace/,tilia, ophidia, c7'ocodilidae, chelonidae, which without dOllbt are conneeted with the general structure of the tectum opticum of the animaIs, especially in so far as th is is influenced by the tOl'US semici7'wlaris intruding lowel' down at the back of the ventricle, especially in the crocodilidae. Fig. 11 gives an idea of this, and shows on a cross seetion the arrangement of the mesene. quintus eells in alligat01' sclerops. A few cells lie in the ,ependyma layers _ whieh surl'ound the ventricle. The majority
( 35 ) lie medial on this level, and generaJlly form, with tllOse fl'om the opposite side one nucleus. This last is also specially distinct in Fig. 10. Ralla temporaria. Fig. 11. Alligator sklerops. t.S-C. = torus semicircularis. chelone midas, as is shown in fig. 12, in {he region of the caudal part of the cornmissura postel'ior. The clllmsy form of the cells is clearly seen here, with a few of a rOUlHlel' form; the latter are relatively more ImmerOllS in {he more dis tal planes. Neither in vamntts salvator nor in eunectes ?/uw'imts is this united medial nucleus found so weIl repl'esented; only a few cells here touch both sides of the medial line. LacertiJia and ophidia possess 3* - 43 -
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