Question

passes through a bony tube.​

Answer 1

Answer:

The bony portion is widest at its tympanic end. It passes through the squamous and petrous portions of the temporal bone but narrows gradually to the isthmus, which is the narrowest part of the eustachian tube. The cartilaginous portion consists of a plate of cartilage posteromedially

Explanation:

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Answer 2

Explanation:

Explain the idea of ethno-development with suitable examples.

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