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Chicken wings and the brachial plexus.

Tam Dieu1, Don Newgreen

  • 1Department of Embryology, Murdoch Children's Research Institute, Royal Children's Hospital, Parkville, Victoria, Australia. tdieu@plasticsurg.com.au

Neurological Research
|May 19, 2007
PubMed
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This study maps chick brachial plexus (BP) development, revealing motor axons emerge from the spinal cord and form the BP. Modern techniques show a shorter waiting period than previously reported.

Area of Science:

  • Developmental biology
  • Neuroscience
  • Embryology

Background:

  • Limb development stages are increasingly understood through gene sequences and functions.
  • Peripheral nerve outgrowth follows specific principles.
  • The brachial plexus (BP) is crucial for limb innervation.

Purpose of the Study:

  • To map the early development of the brachial plexus (BP) in chick embryos.
  • To analyze BP development in relation to the axonal guidance gene Semaphorin3a.
  • To review principles of peripheral nerve outgrowth.

Main Methods:

  • Immunohistochemistry was used to map early brachial plexus development in chicken embryos.
  • In situ hybridization studied the expression pattern of Semaphorin3a, an axonal guidance gene.

Related Experiment Videos

  • Analysis focused on the relationship between BP morphogenesis and Semaphorin3a expression.

    • Main Results:

    • Motor axons innervating the chick wing originate from spinal nerves 12-17.
    • Axons grow towards the limb, forming the plexus at its base.
    • Axons rearrange in response to cues before forming defined nerve trunks, with a shorter observed 'waiting period' than previously reported.

    Conclusions:

    • Brachial plexus development is better understood, with a shorter waiting period observed using modern techniques.
    • The role of Semaphorin3a in BP development is under investigation.
    • Findings may impact management of brachial plexus palsy and peripheral nerve lesions.