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Which embryological structures give rise to the face and neck?
When do the pharyngeal arches develop?
Weeks 4 and 5
Which pharyngeal arch doesn't really develop into anything?
5th pharyngeal arch
Which germ layer contributes to the muscles of the face and neck?
Each pharyngeal arch has four components - what are they?
Mesoderm - develops into muscle
Neural crest - develops into skeleton
Pharyngeal clefts are found on the (inside / outside) and are lined by ___.
Pharyngeal pouches are found on the (inside / outside) and are lined by ___.
Which cranial nerves are associated with pharyngeal pouches
a) CN V
b) CN VII
c) CN IX
d) CN X
Keeping in mind where it's found, what are the two parts of the 1st pharyngeal arch?
What are the bones derived from the
parts of the 1st pharyngeal arch?
a) Maxilla, zygomatic bone, temporal bone
b) Auditory ossicles (malleus, incus)
Which muscles are derived from the 1st pharyngeal arch?
Muscles of mastication
(supplied by V3)
Which cranial nerve is derived from the 1st pharyngeal arch?
Trigeminal nerve and all three divisions
Which bones are derived from the 2nd pharyngeal arch?
Styloid process of temporal bone
Upper parts of hyoid
Which muscles are derived from the 2nd pharyngeal arch?
Muscles of facial expression
Which nerve is derived from the 2nd pharyngeal arch?
Which nerve is derived from the 3rd pharyngeal arch?
Which pharyngeal cleft is the only one to remain after development?
What does it form?
1st pharyngeal cleft
External acoustic meatus
What do the 2nd, 3rd and 4th pharyngeal clefts form before disappearing?
The 1st pharyngeal pouch forms structures of the ___.
The 2nd pharyngeal pouch forms which lymph structure?
The 3rd pharyngeal pouch forms which two structures?
Inferior parathyroid glands
The 4th pharyngeal pouch forms which structures?
Superior parathyroid gland
C cells of thyroid gland
What is a placode?
From which thickened epithelial structures do the ears arise?
Which germ layer are the otic placodes found in?