The origin and development of the telephone switch-board

The amphibian forebrain. VI. Necturus

“…The relations of the chorioid plexus of the cerebrum of Necturus in the median plane are illustrated by Kingsbury (1895) and by Warren ( '05), and slightly to one side of the median plane in our figure 65. The development of these plexuses is clearly portrayed by Warren.…”

“…The conclusion very recently expressed by Noble ('31, p. 483) is that Necturus and Proteus "form a natural group of permanently larval salamanders of unknown ancestry.' ' Kingsbury (1895) figures dorsal, ventral, and lateral views and the median section; the latter is pictured also by Warren ( '05), McKibben ( '11), and Herrick ( '17). Osborn (1888), Warren ('05) and Riithig ( '11 c) illustrate the dorsal view, and Miller ('00) gives dorsal and ventral views of a wax model of this brain.…”

“…More coarse axons are seen in Cajal sections than blue fibers in Weigert preparations, but the former conform to the same pattern as the latter. For the arrangement of the myelinated fibers the exceIlent pictures of Kingsbury (1895) and Rothig ( ' 11 c) should be consulted; compare also the very similar pictures of Siren (Riithig, '11) and Cryptobranchus (Benzon,'26). All of these coarse axons are interpreted as descending, for the known ascending fibers of both lateral and medial forebrain bundles are all very fine and unmyelinated.…”

“…Figure 25 shows the arrangement of unmyelinated fibers at the rostra1 border of the hippocampal commissure on a slightly larger scale ( x 25). Illustrations of transverse sections through the forebrain of Necturus have been published by Kingsbury (1895) , XcEibben ('11) , and Riithig ( ' 11 c), and through the thalamus and midbrain in my paper of 1917. On page 219 of the latter paper are references to Fig.…”

“…62 to 68). Kingsbury (1895) illustrates the median section of the adult and of a larva 4 weeks old and three sagittal Weigert sections. Warren ( '05) also shows adult and larval median sections, and McKibben ('11) gives a projection of the nervus terminalis on the median plane.…”