Developmental Anatomy

Stage 11: Summary

First view Second view

External: the rostral neuropore is in the process of closing; the optic invagination is shallow or still widely open; pharyngeal arches 1 and 2 are evident.

Internal: the sinus venosus develops; the oropharyngeal membrane ruptures; the mesonephric duct and nephric tubules appear; the optic vesicle and optic pit develop.

Lab Manual - Horizon 11

First view Second view

  • Length: 2.5 - 4.5mm.
  • The anterior neoropore is in the process of closing.
  • The optic invagination is either shallow or still widely open.
  • The embryo has two bronchial bars ( mandibular and hyoid).
  • Ovulation age: 23 - 26 days.

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Developmental Stages in Human Embryos by Ronan O'Rahilly and Fabiola Müller.
Published by Carnegie Institution of Washington, Publication 637. 1987.

Stage 11 (PDF 956 KB)


QUESTION: What are the names of the two bronchial bars?