Development of the electrosensory nervous system in Eigenmannia (Gymnotiformes): I. The peripheral nervous system

H. A. Vischer, Michael Lannoo, W. Heiligenberg

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The nerves of the anterior lateral line system in embryonic and larval stages of the weakly electric gymnotiform fish Eigenmannia were visualized by injection of the fluorescent marker DiI into the primordium of the anterior (ALLN) and posterior (PLLN) lateral line nerves. Examination of developmental series reveals that the nerve fibers that innervate the electrosensory and mechanosensory components of the anterior lateral line system are present before the first mechanoreceptors and electroreceptors have differentiated. This suggests that nerve fibers might induce the formation of lateral line receptors. Whereas the innervation of the mechanoreceptive system is already established at an early stage, the afferent innervation of electroreceptors continues to arborize in the periphery, presumably by following pioneer axon pathways. The earliest recognizable stage of the anterior lateral line nerve ganglion (ALLNG) is evident 2 days afer spawning. The ganglion shows two germinal cell masses that develop into the supraorbital-infraorbital and the hyomandibular placodes. The supraorbital-infraorbital placode forms the dorsal part of the ALLNG; the hyomandibular placode forms the ventral part of the ALLNG. Counts of ALLNG cells in embryonic, larval, and adult stages of Eigenmannia show that, at each stage examined, the number of ganglion cells is always significantly larger than the number of mechanoreceptors and electro-receptor units in the periphery. During development, the distribution of ALLNG cell diameters shifts from a unimodal distribution in juveniles to a bimodal distribution in adults, peaking at 8 μm and 18 μm. These results suggest that tuberous electroreceptive organs, which are innervated by the large ALLNG cells, may not be functional prior to day 18. Our results further suggest that the number of ALLNG cells correlates with the rate of induction of lateral line receptors in the periphery.

Original languageEnglish (US)
Pages (from-to)16-40
Number of pages25
JournalJournal of Comparative Neurology
Volume290
Issue number1
DOIs
StatePublished - 1989
Externally publishedYes

Fingerprint

Gymnotiformes
Peripheral Nervous System
Ganglia
Nervous System
Lateral Line System
Neurons
Mechanoreceptors
Nerve Fibers
Electric Fish
Axons
Cell Count

Keywords

  • Development
  • DiI
  • Electroreception
  • Lateral line ganglion
  • Peripheral innervation

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Development of the electrosensory nervous system in Eigenmannia (Gymnotiformes) : I. The peripheral nervous system. / Vischer, H. A.; Lannoo, Michael; Heiligenberg, W.

In: Journal of Comparative Neurology, Vol. 290, No. 1, 1989, p. 16-40.

Research output: Contribution to journalArticle

@article{fa739954f9c2425495c65ac85e33cfdf,
title = "Development of the electrosensory nervous system in Eigenmannia (Gymnotiformes): I. The peripheral nervous system",
abstract = "The nerves of the anterior lateral line system in embryonic and larval stages of the weakly electric gymnotiform fish Eigenmannia were visualized by injection of the fluorescent marker DiI into the primordium of the anterior (ALLN) and posterior (PLLN) lateral line nerves. Examination of developmental series reveals that the nerve fibers that innervate the electrosensory and mechanosensory components of the anterior lateral line system are present before the first mechanoreceptors and electroreceptors have differentiated. This suggests that nerve fibers might induce the formation of lateral line receptors. Whereas the innervation of the mechanoreceptive system is already established at an early stage, the afferent innervation of electroreceptors continues to arborize in the periphery, presumably by following pioneer axon pathways. The earliest recognizable stage of the anterior lateral line nerve ganglion (ALLNG) is evident 2 days afer spawning. The ganglion shows two germinal cell masses that develop into the supraorbital-infraorbital and the hyomandibular placodes. The supraorbital-infraorbital placode forms the dorsal part of the ALLNG; the hyomandibular placode forms the ventral part of the ALLNG. Counts of ALLNG cells in embryonic, larval, and adult stages of Eigenmannia show that, at each stage examined, the number of ganglion cells is always significantly larger than the number of mechanoreceptors and electro-receptor units in the periphery. During development, the distribution of ALLNG cell diameters shifts from a unimodal distribution in juveniles to a bimodal distribution in adults, peaking at 8 μm and 18 μm. These results suggest that tuberous electroreceptive organs, which are innervated by the large ALLNG cells, may not be functional prior to day 18. Our results further suggest that the number of ALLNG cells correlates with the rate of induction of lateral line receptors in the periphery.",
keywords = "Development, DiI, Electroreception, Lateral line ganglion, Peripheral innervation",
author = "Vischer, {H. A.} and Michael Lannoo and W. Heiligenberg",
year = "1989",
doi = "10.1002/cne.902900103",
language = "English (US)",
volume = "290",
pages = "16--40",
journal = "Journal of Comparative Neurology",
issn = "0021-9967",
publisher = "Wiley-Liss Inc.",
number = "1",

}

TY - JOUR

T1 - Development of the electrosensory nervous system in Eigenmannia (Gymnotiformes)

T2 - I. The peripheral nervous system

AU - Vischer, H. A.

AU - Lannoo, Michael

AU - Heiligenberg, W.

PY - 1989

Y1 - 1989

N2 - The nerves of the anterior lateral line system in embryonic and larval stages of the weakly electric gymnotiform fish Eigenmannia were visualized by injection of the fluorescent marker DiI into the primordium of the anterior (ALLN) and posterior (PLLN) lateral line nerves. Examination of developmental series reveals that the nerve fibers that innervate the electrosensory and mechanosensory components of the anterior lateral line system are present before the first mechanoreceptors and electroreceptors have differentiated. This suggests that nerve fibers might induce the formation of lateral line receptors. Whereas the innervation of the mechanoreceptive system is already established at an early stage, the afferent innervation of electroreceptors continues to arborize in the periphery, presumably by following pioneer axon pathways. The earliest recognizable stage of the anterior lateral line nerve ganglion (ALLNG) is evident 2 days afer spawning. The ganglion shows two germinal cell masses that develop into the supraorbital-infraorbital and the hyomandibular placodes. The supraorbital-infraorbital placode forms the dorsal part of the ALLNG; the hyomandibular placode forms the ventral part of the ALLNG. Counts of ALLNG cells in embryonic, larval, and adult stages of Eigenmannia show that, at each stage examined, the number of ganglion cells is always significantly larger than the number of mechanoreceptors and electro-receptor units in the periphery. During development, the distribution of ALLNG cell diameters shifts from a unimodal distribution in juveniles to a bimodal distribution in adults, peaking at 8 μm and 18 μm. These results suggest that tuberous electroreceptive organs, which are innervated by the large ALLNG cells, may not be functional prior to day 18. Our results further suggest that the number of ALLNG cells correlates with the rate of induction of lateral line receptors in the periphery.

AB - The nerves of the anterior lateral line system in embryonic and larval stages of the weakly electric gymnotiform fish Eigenmannia were visualized by injection of the fluorescent marker DiI into the primordium of the anterior (ALLN) and posterior (PLLN) lateral line nerves. Examination of developmental series reveals that the nerve fibers that innervate the electrosensory and mechanosensory components of the anterior lateral line system are present before the first mechanoreceptors and electroreceptors have differentiated. This suggests that nerve fibers might induce the formation of lateral line receptors. Whereas the innervation of the mechanoreceptive system is already established at an early stage, the afferent innervation of electroreceptors continues to arborize in the periphery, presumably by following pioneer axon pathways. The earliest recognizable stage of the anterior lateral line nerve ganglion (ALLNG) is evident 2 days afer spawning. The ganglion shows two germinal cell masses that develop into the supraorbital-infraorbital and the hyomandibular placodes. The supraorbital-infraorbital placode forms the dorsal part of the ALLNG; the hyomandibular placode forms the ventral part of the ALLNG. Counts of ALLNG cells in embryonic, larval, and adult stages of Eigenmannia show that, at each stage examined, the number of ganglion cells is always significantly larger than the number of mechanoreceptors and electro-receptor units in the periphery. During development, the distribution of ALLNG cell diameters shifts from a unimodal distribution in juveniles to a bimodal distribution in adults, peaking at 8 μm and 18 μm. These results suggest that tuberous electroreceptive organs, which are innervated by the large ALLNG cells, may not be functional prior to day 18. Our results further suggest that the number of ALLNG cells correlates with the rate of induction of lateral line receptors in the periphery.

KW - Development

KW - DiI

KW - Electroreception

KW - Lateral line ganglion

KW - Peripheral innervation

UR - http://www.scopus.com/inward/record.url?scp=0024368434&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024368434&partnerID=8YFLogxK

U2 - 10.1002/cne.902900103

DO - 10.1002/cne.902900103

M3 - Article

C2 - 2592608

AN - SCOPUS:0024368434

VL - 290

SP - 16

EP - 40

JO - Journal of Comparative Neurology

JF - Journal of Comparative Neurology

SN - 0021-9967

IS - 1

ER -