PMID: 9550148Apr 29, 1998Paper

Early development of the peripheral nervous system in a lancelet species

The Journal of Comparative Neurology
K YasuiS C Zhang

Abstract

The developmental pattern of the lancelet (amphioxus) peripheral nervous system from embryos to larvae has been studied by using wholemount immunostaining and transmission electron microscopy. The peripheral nerves first appeared on the anterior dorsal surface of the medulla at the middle neurula stage, when the anterior nerve cord was just closing. A single axon with a large growth cone was the progenitor of each nerve. The nerve roots adopted an asymmetric arrangement soon after. The first nerve, likely a pair of pure sensory nerves, sprouted from the anterior tip of the nerve cord. This nerve may be comparable topographically to the preoptic nerve (the posterior branch of the terminal nerve) in lungfishes. However, the neuron that first extends its axon was located in the medulla, as in the other posterior nerves. One of the extramedullary primary sensory neurons, the corpuscles of de Quatrefages, appeared in larvae with the mouth and two anterior gill pores. Their axons were seemingly fasciculated with the efferent axon of the first nerve. The second nerve, the most complex one to appear during embryonic and early larval development, innervated the preoral pit and the buccal region. The third and fourth nerves on the left s...Continue Reading

Citations

Jun 10, 2006·International Journal of Biological Sciences·Laura GodoyRicard Albalat
Aug 24, 2007·International Journal of Biological Sciences·Daniel Meulemans, Marianne Bronner-Fraser
Nov 1, 2008·Integrative and Comparative Biology·Shigeru Kuratani
Jun 9, 2012·BMC Neuroscience·Simona CandianiMario Pestarino
Feb 9, 2016·Zoological Letters·Takao KajiKinya Yasui

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