Related Experiment Videos
Temporary contacts formed between developing optic fibers in the chick
Journal of Embryology and Experimental Morphology
|February 1, 1977
Summary
Temporary junctions form between developing chick embryo optic nerve axons, aiding neural development. These transient cell connections, potentially gap and occludens junctions, are crucial for axonal growth and guidance.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Developing axons require transient cell-cell interactions for proper guidance.
- The precise nature and function of early axonal junctions remain incompletely understood.
Purpose of the Study:
- To investigate the presence and distribution of temporary junctions in developing chick embryo optic axons.
- To characterize the morphology of these transient axonal connections.
Main Methods:
- Light microscopy of chick embryo optic nerve tissue.
- Analysis of axonal morphology and intercellular spaces during development (E-3 to E-18).
Main Results:
- Temporary junctions were observed along the entire length of developing optic axons.
- These junctions featured reduced intercellular space due to close plasma membrane apposition.
- Focal junctions between adjacent axons and fasciae adherentes at the growth cone were identified.
Conclusions:
- Transient junctions are integral to developing optic axons, potentially mediating cell-cell communication and guidance.
- The observed junctions may represent early forms of gap and occludens junctions.
- These temporary structures likely play a critical role in axonal pathfinding and neural circuit formation.