Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Interspecific variation in the chelonian primary visual system

S Hergueta1, M Lemire, R Ward

  • 1Laboratoire d'Anatomie Comparée, Muséum National d'Histoire Naturelle, Paris, France.

Journal Fur Hirnforschung
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Long-term monitoring of GMOs in EU food and feed: a multi-national survey to optimize enforcement strategies.

GM crops & food·2026
Same author

Challenges in modeling the Agility multileaf collimator in treatment planning systems and current needs for improvement.

Medical physics·2022
Same author

Association between exposure to persistent organic pollutants and mercury, and glucose metabolism in two Canadian Indigenous populations.

Environmental research·2020
Same author

Towards a better understanding of the benefits and risks of country food consumption using the case of walruses in Nunavik (Northern Quebec, Canada).

The Science of the total environment·2020
Same author

Single nucleotide polymorphisms in an intergenic chromosome 2q region associated with tissue factor pathway inhibitor plasma levels and venous thromboembolism.

Journal of thrombosis and haemostasis : JTH·2016
Same author

Melissa officinalis extract induces apoptosis and inhibits proliferation in colon cancer cells through formation of reactive oxygen species.

Phytomedicine : international journal of phytotherapy and phytopharmacology·2015

The turtle visual system shows stable contralateral projections to 15 brain targets. However, ipsilateral projections vary significantly across species, unrelated to taxonomy or lifestyle.

Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Visual System Research

Background:

  • The primary visual system's structure and projections are crucial for understanding sensory processing in vertebrates.
  • Turtles (Testudines) represent an ancient reptilian lineage with diverse ecological niches, making them valuable models for evolutionary neurobiology.

Purpose of the Study:

  • To investigate the organization of the primary visual system across a broad range of turtle species.
  • To compare the patterns of contralateral and ipsilateral visual projections in turtles.
  • To explore potential correlations between visual pathway variations, taxonomy, and ecological factors.

Main Methods:

  • Autoradiography was employed to trace neural pathways.
  • The study encompassed 21 turtle species from nine distinct families.

Related Experiment Videos

  • Visual projections were mapped to specific brain nuclei and tectal layers.

    • Main Results:

    • All studied turtle species exhibited contralateral visual projections to 15 consistent brain targets, including hypothalamic, thalamic, pretectal, and optic tectal structures.
    • Ipsilateral visual projections demonstrated significant interspecific variability, ranging from limited hypothalamic connections to widespread projections across primary visual centers.
    • No clear relationship was found between the variation in ipsilateral projections and the species' taxonomic classification or mode of life.

    Conclusions:

    • The contralateral visual pathway in turtles is highly conserved across diverse species.
    • The variability in ipsilateral visual projections suggests evolutionary plasticity or differential functional roles.
    • Further research is needed to elucidate the factors driving the observed diversity in ipsilateral visual pathways in turtles.