Flashcards in 16. Pharyngeal Arches Deck (48)
What week of development do the pharyngeal arches develop in?
What germ layer is found in the clefts?
What germ layer is found in the pouches?
What is derived from the 1st pharyngeal arch?
Malleus and incus
What is derived from the 2nd pharyngeal arch?
Lesser horn of hyoid
What is derived from the 3rd pharyngeal arch?
Greater horn of hyoid
What is derived from the 4th pharyngeal arch?
Upper thyroid cartilage
What happens to the 5th pharyngeal arch?
What is derived from the 6th pharyngeal arch?
Rest of the thyroid cartilage
What is derived from the 1st pharyngeal cleft?
External acoustic meatus
What happens if the 2nd, 3rd and 4th clefts don't disappear?
Presents as lumps under the sternocleidomastoid
What is it called if cervical cysts are open to the surface?
External branchial fistula
What do internal branchial fistulas open into?
Bed of palatine tonsils
What is derived from the 1st pharyngeal pouch?
What is derived from the 2nd pharyngeal pouch?
What is derived from the 3rd pharyngeal pouch?
What is derived from the 4th pharyngeal pouch?
What does the ultimobranchial body become?
Parafollicular cells of the thyroid
What are 2 defects in the 1st arch?
What are the symptoms of Treacher Collins Syndrome?
Hypoplasia of maxilla, mandible and zygomatic arches
Associated with cleft palate and external ear defects
What are the triad of conditions in Robin Sequence?
What is micrognathia?
Poor growth of mandible
What is glossoptosis?
Posteriorly placed tongue
Name a syndrome of 3rd and 4th arch defects?
What are the symptoms of DiGeorge anomaly?
No thymus or parathyroid glands
Persistant truncus arteriosus
Abnormal external ear
What is the innervation of the 1st arch?
What is the innervation of the 2nd arch?
What is the innervation of the 3rd arch?
What is the innervation of the 4th to 6th arches?