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Related Experiment Videos

New experimental evidence for somite resegmentation.

R Huang1, Q Zhi, B Brand-Saberi

  • 1Anatomisches Institut der Universität Freiburg, Lehrstuhl II, Germany.

Anatomy and Embryology
|September 20, 2000
PubMed
Summary

Vertebral resegmentation in avian embryos involves contributions from two adjacent somites for vertebral bodies and neural arches. Ribs also form from two somites, with exceptions for the costal head.

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Area of Science:

  • Developmental Biology
  • Embryology
  • Anatomy

Background:

  • Vertebral development follows the concept of resegmentation, where vertebral boundaries are offset from somite boundaries.
  • Previous experimental evidence using somite transplantation supported resegmentation but faced interpretation challenges due to orientation difficulties.

Purpose of the Study:

  • To clarify the contribution of somites to vertebral formation in avian embryos.
  • To resolve ambiguities in previous studies regarding resegmentation, particularly for neural arches, processes, and ribs.

Main Methods:

  • Grafting of one and a half somites from quail embryos to chick embryos.
  • Utilizing quail-chick chimera to precisely track cell origins and eliminate orientation errors.

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Main Results:

  • Vertebral bodies and neural arches are derived from the cellular material of two adjacent somites.
  • Ribs are also formed from two somites, but the costal head originates from a single somite.
  • Intersegmental muscles and their skeletal attachment sites originate from the same somite.

Conclusions:

  • The study confirms and refines the concept of vertebral resegmentation in avian development.
  • The precise somite contribution to different vertebral components, including ribs, is elucidated.
  • The findings provide a clearer understanding of embryonic skeletal patterning and segmentation.