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The retinal projection to the nucleus lentiformis mesencephali in zebra finch (Taeniopygia guttata) and Anna’s hummingbird (Calypte anna)

Abstract

In birds, the nucleus of the basal optic root (nBOR) and the nucleus lentiformis mesencephali (LM) are retinal recipient nuclei involved in the analysis of optic flow and the generation of the optokinetic response. In both pigeons and chickens, retinal inputs to the nBOR arise from displaced ganglion cells (DGCs), which are found at the margin of the inner nuclear and inner plexiform layers. The LM receives afferents from retinal ganglion cells, but whether DGCs also project to LM is a matter of debate. Previous work in chickens had concluded that DGCs do not project to LM, but a recent study in pigeons found that both retinal ganglion cells and DGCs project to LM. These findings leave open the question of whether there are species differences with respect to the DGC projection to LM. In the present study, we made small injections of retrograde tracer into the LM in a zebra finch and an Anna’s hummingbird. In both cases, retrogradely labeled retinal ganglion cells and DGCs were observed. These results suggest that a retinal input to the LM arising from DGCs is characteristic of most, if not all, birds.

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Abbreviations

DGC:

Displaced ganglion cell

GCL:

Ganglion cell layer

GLv:

Lateral geniculate nucleus, pars ventralis

GT:

Tectal grey

INL:

Inner nuclear layer

IPL:

Inner plexiform layer

LMm/l:

Nucleus lentiformis mesencephali pars medialis/lateralis

nBOR:

Nucleus of the basal optic root

nRT:

Nucleus rotundus

ONL:

Outer nuclear layer

OPL:

Outer plexiform layer

RGC:

Retinal ganglion cell

TeO:

Optic tectum

TrO:

Optic tract

References

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Acknowledgements

We would like to thank Melissa Armstrong Rebecca Long for help with this study.

Funding

This research was supported by funding to D.R.W. and D.L.A. from the Natural Sciences and Engineering Research Council of Canada (NSERC).

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Authors and Affiliations

Authors

Contributions

All authors had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: CG-I, AHG, DLA, DRW. Acquisition of data CG-I, AHG, MRD, DRW. Analysis and interpretation of data: CG-I, AHG, MRD, DLA, DRW. Drafting of the article: CG-I. Critical revision of the article for important intellectual content: CG-I, AHG, DLA, DRW. Obtained funding: DLA, DRW. Study supervision: DLA, DRW.

Corresponding author

Correspondence to Cristian Gutierrez-Ibanez.

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Conflict of interest

The authors have no conflict of interest.

Ethical approval

All experimental procedures were approved by the University of British Columbia Animal Care Committee in accordance with the guidelines set out by the Canadian Council on Animal Care.

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Gutierrez-Ibanez, C., Gaede, A.H., Dannish, M.R. et al. The retinal projection to the nucleus lentiformis mesencephali in zebra finch (Taeniopygia guttata) and Anna’s hummingbird (Calypte anna). J Comp Physiol A 204, 369–376 (2018). https://doi.org/10.1007/s00359-018-1245-5

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  • DOI: https://doi.org/10.1007/s00359-018-1245-5

Keywords

  • Displaced ganglion cells
  • Optic flow
  • Optokinetic
  • Accessory optic system
  • Nucleus of the basal optic root