Histology 3C
Pharyngeal Development Quiz
Test your knowledge on the intricate development of pharyngeal arches and clefts! This quiz covers key aspects of their anatomy, embryology, and their contributions to craniofacial development.
- Assess your understanding of pharyngeal structures
- Learn about their relationships to various anatomical features
- Explore the environmental factors influencing orofacial development
Phayngeal arches:
Appear in the 4th or 5th week of development
Core contains mesenchyme
The core of each arch contains mesenchyme derived from the paraxial and lateral plate mesoderm and neural crest cells
Plaryngeal arches appear in the 9th week of development
Arch is covered on the outside by ectoderm and on the inside by endoderm
Contribute to the formation of the neck
Correct pairs:
1st pharyngeal arch - eustacian tube, incus and malleus
2nd pharyngeal arch - stapes
3rd pharyngeal arch - greater horn
What does each pharyngeal cleft make?
1st pharyngeal cleft - auditory meatus and eardrum
2nd, 3rd and 4th pharyngeal cleft - cervical sinus, loose contact with outside
What each pharyngeal pouch makes:
1st - middle ear, eustachian tube
2nd - palatine tonsils
3rd - inferior parathyroid gland and thymus
4th - superior parathyroid gland and thymus
Pharyngeal clefts:
1st pair gives rise to the auditory meatus
2nd, 3rd and 4th loose contact with the outside
1st, 2nd and 3rd loose contact with the outside
Cervical sinus is formed by all clefts
Cervical sinus is created by the 2nd, 3rd and 4th cleft
The 5th week embryo is characterized by the presence of four pairs of clefts
Face development:
Upper lip is formed by four prominences
Upper lip is formed by two lateral nasal prominences
Facial prominences appear at the end of the 4th week
Nasal placodes are local thickenings of the surface ectoderm on both sides of the frontal prominences
Nasal placodes are part of the endodermal epithelium
The lower lip and jaw is formed from the mandibular prominences
What arises from the pharyngeal pouches?
3rd and 4th - parathyroid gland
4th - thyroid gland
3rd - thymus
1st - eustacian tube and middle ear cavity
The second pharyngeal pouch gives rise to:
Eustachian tube
Part of the palatine tonsil
Parathyroid gland
Thymis
C-cells
Pharyngeal arches:
Contributes to the formation of the neck
Plays a role in formation of the face
Do not contain mesenchyme
Are covered on the outside by surface ectoderm
Appear just before birth
What arises from the pharyngeal pouches?
Adenohypophysis
Neurohypophysis
Parathyroid gland
Pineal gland
Thyroid gland
Thymus
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