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Questions and Answers
What is the composition of each pharyngeal arch?
Which nerve supplies derivatives of the 3rd pharyngeal arch?
What covers the outer surface of the pharyngeal arches?
How many mesodermal thickenings are there on both sides of the pharynx?
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What is the fate of the ventral part of the first pharyngeal pouch?
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Study Notes
Pharyngeal Arch Composition
- Each pharyngeal arch consists of a core of mesodermal cells covered by ectoderm externally and endoderm internally.
Nerve Supply of 3rd Pharyngeal Arch
- The glossopharyngeal nerve (CN IX) supplies derivatives of the 3rd pharyngeal arch.
Covering of Pharyngeal Arches
- The outer surface of the pharyngeal arches is covered by ectoderm.
Mesodermal Thickenings
- There are six mesodermal thickenings or arches on both sides of the pharynx.
Fate of Ventral Part of 1st Pharyngeal Pouch
- The ventral part of the first pharyngeal pouch gives rise to the middle ear cavity.
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Description
Test your knowledge on the development of pharyngeal (branchial) arches in embryology. Learn about the mesodermal thickenings, appearance timeline, and the ectoderm and endoderm covering of the arches.
