The lateral-line nerves of Xenopus

Van Der Horst, C.J.

Psychiatr En Neurol Bladen (3/4): 426-435


Accession: 025842193

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Of the anurous amphibians only the Aglossa, to which Xenopus and Pipa belong, possess lateral-line sense organs throughout life. In urodela the dorsal lateral-line, gasserian, geniculate, ventral lateral-line, and auditory ganglia form one continuous mass. In Anura, including Aglossa, the auditory ganglion is separate from the others and these latter have fused to form one complex. In Selachians, sturgeons and Ceratodus the anterior lateral-line nerve enters the brain by 2 roots, a dorsal and a ventral; in Amblystoma and Salamandra by 3 or 4 roots; in Necturus by 2 roots; in Xenopus, adult Pipa and larval Cacosternum by a single root. This single root of Anura corresponds to tne ventral root of the lateral-line nerve in fishes and Urodela. The lateralis post. enters the brain in Urodela by 2 rootlets, in Xenopus by many separate bundles. The medulla oblongata of Xenopus like that of Pipa agrees with that of Urodela in that end-nuclei of the lateral-line nerves are present, but there is no dorsal lobus lineae lateralis. The crista cerebellaris of Xenopus is not directly continuous with the molecular layer of the cerebellum as in fishes. A well developed auricular lobe seems to be present in Anura, but in Xenopus there is no auricle at all.