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Questions and Answers
What is the name of the first pharyngeal arch?
What is the name of the first pharyngeal arch?
- The 6th arch
- Mandibular arch (correct)
- The 5th arch
- Hyoid arch
What happens to the 5th pharyngeal arch?
What happens to the 5th pharyngeal arch?
- It fuses with the 4th arch
- It becomes a permanent structure
- It transforms into the hyoid arch
- It disappears eventually (correct)
What is the core tissue of each pharyngeal arch called?
What is the core tissue of each pharyngeal arch called?
- Endoderm
- Ectoderm
- Ectomesenchyme (correct)
- Mesoderm
What separates the pharyngeal arches from the inside?
What separates the pharyngeal arches from the inside?
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What are the outer coverings of each pharyngeal arch made of?
What are the outer coverings of each pharyngeal arch made of?
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Study Notes
Development of the Pharyngeal Apparatus
- Development of the head and neck begins at the 4th and 5th week of embryonic development.
- Pharyngeal apparatus originates as a small area between the brain and the pericardial bulges.
- Formation of the pharyngeal arches occurs at this stage, which appear as cylindrical bars.
- Pharyngeal arches are paired structures that grow on either side of the future head and neck.
- They grow caudally, pushing the developing heart down and elongating to form the neck of the embryo.
- Pharyngeal arches eventually fuse at the centerline, contributing to the formation of the head and neck of the developing embryo.
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