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Updated: Jun 11, 2026
14:36
Isolation and Culture of Chick Ciliary Ganglion Neurons
Published on: August 8, 2020
Intrinsic choroidal neurons in the chicken eye: chemical coding and synaptic input
Karin Stübinger1, Axel Brehmer, Winfried L Neuhuber
1Institut für Anatomie I, Universität Erlangen-Nürnberg, 91054 Erlangen, Germany.
Histochemistry and Cell Biology
|July 8, 2010
Summary
Intrinsic choroidal neurons (ICNs) in chickens express specific neurochemicals and receive input from various nerve fibers. These findings aid in understanding ocular homeostasis and myopia research.
Area of Science:
- Neuroscience
- Ophthalmology
- Comparative Anatomy
Background:
- Intrinsic choroidal neurons (ICNs) are found in primates and birds, potentially regulating choroidal blood flow.
- Chickens are a key model for myopia research, making their ocular neuroanatomy significant.
Purpose of the Study:
- To investigate the chemical coding of chicken ICNs and related cranial ganglia.
- To identify the synaptic inputs onto chicken ICNs.
- To compare chicken ICNs with those in other species and the autonomic nervous system.
Main Methods:
- Utilized double or triple immunohistochemistry on chicken choroid and cranial ganglia (ciliary, superior cervical, pterygopalatine, trigeminal).
- Examined markers including CGRP, ChAT, GAL, nNOS, SOM, TH, VIP, and VMAT2.
- Employed light, fluorescence, and confocal laser scanning microscopy for documentation.
Main Results:
- Chicken ICNs express nNOS/VIP/GAL but lack ChAT and SOM.
- ICNs receive input from TH/VMAT2-, CGRP-, and ChAT-positive nerve fibers.
- A significant proportion of pterygopalatine and superior cervical ganglion neurons share ICNs' chemical code.
Conclusions:
- Chicken ICNs share neurochemical similarities with ICNs in other species.
- The absence of cholinergic markers in ICNs challenges current autonomic nervous system models.
- This study provides a foundation for future research into ICN function and ocular homeostasis.
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