Which part of the ear contains cilia, ceruminous glands, and sebaceous glands?

The ear canal, also known as the external auditory canal, is the part of the ear that contains cilia, ceruminous glands, and sebaceous glands.

Cilia are tiny hair-like structures that line the ear canal and play a vital role in protecting the ear by trapping dust, debris, and microorganisms, helping to keep the ear clean. Ceruminous glands, which are specialized sweat glands, secrete cerumen (earwax), providing a protective barrier against bacteria and foreign particles. Sebaceous glands also contribute to the ear's health by producing oils that help keep the skin moist and protect against irritation.

These components work together to maintain the ear canal's environment, ensuring it remains free of harmful substances while also facilitating listening. In contrast, the middle ear contains the ossicles (small bones) that transmit sound vibrations, the inner ear is primarily involved in hearing and balance with structures like the cochlea and vestibular system, and the external ear is a broader term that encompasses the visible parts of the ear but not specifically the inner workings of the ear canal. Thus, the ear canal is the correct answer due to its specific functions and structures.