Q:

The long head of the triceps muscle develops from which of the following?

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The long head of the triceps muscle develops from which of the following?


  1. Posterior condensation
  2. Anterior condensation
  3. Lateral plate mesoderm
  4. Extraembryonic mesoderm
  5. Sclerotome mesoderm

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A. Somite mesoderm migrates into the limb bud and forms two condensations. The poste-rior condensation of the upper limb gives rise to the extensors of the upper limb, which attain a posterior location in the adult because of the lateral rotation of 90.

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