14 Questions
What is a primary function of pharyngeal arches during embryonic development?
Establishment of the embryonic body form
Which of the following cell groups is NOT a derivative of mesoderm?
Ectoderm
What is a common outcome of pharyngeal apparatus malformations?
All of the above
During which stage of embryonic development do pharyngeal arches form?
Neurulation
What is the primary function of neural crest cells?
Development of the nervous system
Which of the following is a derivative of the pharyngeal pouches?
Thymus
What is the function of pharyngeal apparatus?
To give rise to arteries, muscles, cartilage, bone of face and neck
What is the number of pharyngeal arches?
6
What is the fate of the 5th pharyngeal arch?
It obliterates completely
What is the sequence of appearance of the pharyngeal arches?
Cranial-to-caudal
What forms the core of the pharyngeal arches?
Mesenchyme
What do the muscle components of the arches have?
Their own nerve and arterial components
What contributes to the formation of skeletal muscles of the face?
Emigrant neural crest cells
What do the pharyngeal arches contain?
Cartilages
Study Notes
Pharyngeal Apparatus and Derivatives
- Pharyngeal apparatus consists of bilateral mesodermal outpouchings of mesoderm on the developing pharynx
- Gives rise to arteries, muscles, cartilage, and bone of the face and neck
Pharyngeal Arches
- 6 in number, but only 5 give rise to permanent structures
- Appear in a cranial-to-caudal sequence
- Each arch has a core of mesenchyme, ectodermal covering, and endodermal lining
- Mesoderm forms face and neck musculature
- Each arch is characterized by its own muscular components
- Muscle components of arches have their own nerve and arterial components
Pharyngeal Clefts and Pouches
- Pharyngeal clefts are ectodermal
- Pharyngeal pouches are endodermal
Development of Pharyngeal Apparatus
- Pharyngeal arches are formed from the mesodermal outpouchings
- Emigrant neural crest cells contribute to the formation of skeletal muscles of the face
- Contain cartilages
This quiz covers the pharyngeal apparatus, its contributions to embryonic body form, and derivative structures. It also discusses congenital anomalies and malformations of the pharyngeal apparatus.
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