Anatomy-7

A 4-month-old male infant is brought to the
clinic because of excessive noisy respiration.
On examination, the infant is within the normal
range of growth, appears healthy, and does not
show respiratory distress. Phonation is normal,
along with head and neck examination findings.
However, the child displays stridor (highpitched
breathing sound) on inspiration,
accentuated in the supine position. The parents
report that the same stridor is heard
during feeding or when the child is agitated.
The attending physician places the child in the
prone position and the stridor is relieved. To
confirm, she holds the child in a neck extended
position, which also relieves the stridor. An
endoscopic laryngeal examination reveals
bulky arytenoids cartilages and the diagnosis
of laryngomalacia is established. During development,
the arytenoids cartilages arise from
which of the following?
(A) first pharyngeal arch
(B) second pharyngeal arch
(C) third pharyngeal arch
(D) fifth pharyngeal arch
(E) sixth pharyngeal arch

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