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  • cells
  • The cells that ultimately form the pectoralis and other brachial muscles migrate from the somites into the lateral mesoderm between 2 and 2.5 days in ovo. (mcmaster.ca)
  • disease
  • Moreover, it is the largest muscle to be affected by hereditary muscular dystrophy in the line of chickens afflicted with this disease. (mcmaster.ca)
  • evidence
  • Others have cited evidence to show that some muscles, including the pectoralis major muscle of the chick, are derived from the somatopleuric mesoderm adjacent to the somites. (mcmaster.ca)
  • contribute
  • The myotomal layers of the somites do not appear until 2.5 days in ovo and do not contribute to the formation of the brachial muscles. (mcmaster.ca)