𝔖 Bobbio Scriptorium
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The giant nerve fiber system in balanoglossids

✍ Scribed by Theodore H. Bullock

Publisher
John Wiley and Sons
Year
1944
Tongue
English
Weight
911 KB
Volume
80
Category
Article
ISSN
0021-9967

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✦ Synopsis

The extraordinary giant nerve fibers of several groups of higher invertebrates and lower vertebrates hare excited inuch interest in recent years. Much of this is due to the opportunities for study of single axons afforded by such fibers. But a number of studies have also appeared aimed a t the general problem of the evolutionary and physiologic meaning of these giant fiber systems. Such systems have apparently been developed independently a number of times in evolution. They are known in certain but not all subgroups of the Platyhelminthes, Nemertinea, Annelida, Arthropoda, Mollusca and Chordata and are possibly present in still other phyla. They are variously organized in the different groups and are not readily homologized. I n some aiiirnals the entire neuron is confined t o the central nervous system.

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