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Segmentation in the vertebrate nervous system.

R J Keynes, C D Stern

|August 5, 1984

Summary

This summary is machine-generated.

Growing axons in vertebrate embryos navigate using cues within somites. Experiments show anterior somite cells, not the neural tube, guide motor and sensory axon pathways.

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Area of Science:

Developmental Neuroscience
Axon Guidance Mechanisms
Vertebrate Embryogenesis

Background:

Growing axons in the vertebrate peripheral nervous system are guided by specific cues.
The precise cellular mechanisms underlying this axon guidance remain largely unknown.
Understanding how axons choose between neighboring cell groups is crucial for developmental biology.

Purpose of the Study:

To investigate the cellular mechanisms guiding motor and sensory axon outgrowth in vertebrate embryos.
To determine whether the neural tube or somitic cells provide the guidance cues.
To identify the specific somitic cells responsible for directing axon pathfinding.

Main Methods:

Utilized zinc iodide-osmium tetroxide staining in chick embryos to visualize axon pathways.

Related Experiment Videos

Performed experimental rotations of the neural tube relative to somites.

Executed rotations of the somitic mesoderm around an antero-posterior axis prior to segmentation.

Main Results:

Motor and sensory axons consistently grew through the anterior half of each somite.
Neural tube rotation did not alter the anterior somite preference, indicating neural segmentation is not intrinsic.
Somitic mesoderm rotation resulted in axons growing through the originally anterior (now posterior) half, confirming somite-derived cues.

Conclusions:

A difference exists between anterior and posterior somite cells that dictates axon outgrowth direction.
The neural tube does not intrinsically determine the anterior-posterior positioning of axon outgrowth.
Somite-derived cues are critical for guiding motor and sensory axons, a mechanism conserved across vertebrates.