Olfactory epithelium develop from

Options

A. Embryonic endoderm
B. Embryonic ectoderm
C. Embryonic mesoderm
D. Embronic mesenchyme.

Answer

To determine the origin of the olfactory epithelium, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options regarding the embryonic origin of the olfactory epithelium:
- A) Embryonic endoderm
- B) Embryonic ectoderm
- C) Embryonic mesoderm
- D) Embryonic mesenchyme

2. **Understand the Germ Layers**: In embryonic development, there are three primary germ layers:
- Ectoderm: This layer gives rise to the nervous system, skin, and sensory organs.
- Endoderm: This layer forms the lining of the gut and other internal organs.
- Mesoderm: This layer contributes to muscles, bones, and the circulatory system.

3. **Focus on the Ectoderm**: Since the olfactory epithelium is involved in the sense of smell and is part of the sensory system, it is crucial to identify which germ layer is responsible for sensory organs.

4. **Link to Olfactory Epithelium**: The olfactory epithelium contains sensory cells that have odorant receptors. These sensory cells are derived from the ectoderm, which is responsible for developing nervous tissue and sensory organs.

5. **Conclusion**: Based on the information about the germ layers and their derivatives, the olfactory epithelium develops from the embryonic ectoderm.

### Final Answer:
The olfactory epithelium develops from **B) Embryonic ectoderm**.

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