alleryStart learning →From which germ layer do the olfactory pits form?
AFrom endodermal tissue
BFrom ectodermal tissue
CFrom mesodermal tissue
DFrom neural crest tissue
Answer & Solution
Correct answer: B. From ectodermal tissue
1. Most respiratory structures arise from endoderm, which makes this one an exception worth holding onto.
2. Ectodermal tissue from the anterior head region invaginates posteriorly to form the olfactory pits.
3. Those pits then fuse with the endodermal tissue of the developing pharynx.
4. The pits enlarge to become the nasal cavity, so the second option is correct.
_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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