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Questions and Answers
What is the composition of each pharyngeal arch?
What is the composition of each pharyngeal arch?
- Ectodermal cells giving rise to skin and hair
- Mesodermal cells giving rise to bones, cartilages, and muscles (correct)
- Neural crest cells giving rise to sensory organs
- Endodermal cells giving rise to nerves and blood vessels
Which nerve supplies derivatives of the 3rd pharyngeal arch?
Which nerve supplies derivatives of the 3rd pharyngeal arch?
- Vagus nerve
- Mandibular nerve
- Glossopharyngeal nerve (correct)
- Facial nerve
What covers the outer surface of the pharyngeal arches?
What covers the outer surface of the pharyngeal arches?
- Neural crest cells
- Mesodermal cells
- Endodermal cells
- Ectodermal cells (correct)
How many mesodermal thickenings are there on both sides of the pharynx?
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?
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.
