alleryStart learning →The lung bud bulges from which embryonic structure?
AThe pharyngeal pouches
BThe olfactory pit floor
CThe endoderm of the foregut
DThe mesoderm of the somites
Answer & Solution
Correct answer: C. The endoderm of the foregut
1. The lung bud forms at about the same time as the olfactory pits, around week 4.
2. It is a dome-shaped structure of tissue bulging from the foregut.
3. The foregut is endoderm sitting just inferior to the pharyngeal pouches.
4. So the lung bud arises from foregut endoderm, and the first option names the neighbouring structure instead.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.7 Embryonic Development of the Respiratory System_
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