Question

Olfactory epithelium develops from
A. Embryonic endoderm
B. Embryonic ectoderm
C. Embryonic mesoderm
D. Embryonic mesenchyme

Answer 1

Hint: Olfactory epithelium is the specialized epithelium found in the nasal cavity which helps to detect smell and it covers the roof of the nose and around the nostrils and is directly responsible for detecting the odor.

Complete answer:
> During embryonic development, the olfactory epithelium is derived from two types of cells such as olfactory placodes and neural crest cells.
> In the embryonic stage, the olfactory epithelium consists of apical and basal progenitor cells and olfactory neuron cells.
> Early embryonic neurogenesis depends on the apical cells, where the later embryogenesis and secondary embryogenesis depend on the basal cells.
> Placode is nothing but the aggregations of the ectoderm in the developmental region of the future vertebral head.
> The olfactory placode had formed as two thickening’s, the first one is the non-neural region of the embryonic ectoderm.
> This olfactory placode normally derives from the anterior portion of the neural tube where the development of olfactory placode requires the presence of the neural crest-derived mesenchymal cells
> When it comes to the clinical significance of the olfactory epithelium, it has the regenerative capability, and whenever there is more exposure to the toxins, sprays, and fumes it may damage and when there is and damage to the interior of the nose if the damage is little the regeneration, happens normally, but if the damage is more, it might be destroyed permanently.
> When comes to question, from the above explanation it derives from ectodermal derived olfactory placodes through it also derive from neural crest cells of mesenchymal origin, the major portion is ectoderm.

So, the answer is embryonic ectoderm.

Note:
Olfactory epithelium majorly consists of two types of cells, they are basal, supporting, and olfactory receptor cells, among these basal cells, are stem cells, so that give rise to olfactory receptor cells.