Internal ear is .................. in origin while middle ear is ............ in origin.

Explanation

**Step-by-Step Solution:**

1. **Identify the Germ Layers**: Understand that there are three primary germ layers in embryonic development: ectoderm, mesoderm, and endoderm. Each layer gives rise to different structures in the body.

2. **Determine the Origin of the Internal Ear**: The internal ear, which includes structures such as the cochlea and vestibular system, is derived from the ectoderm. This is because the internal ear is closely associated with the neural structures, which originate from the ectoderm.

3. **Determine the Origin of the Middle Ear**: The middle ear, which includes structures such as the eustachian tube and the ossicles, is derived from the endoderm. This layer is responsible for forming the linings of the inner organs, including those in the ear.

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