What is the external auditory meatus of the ear?
The external auditory meatus, also known as the ear canal or the acoustic meatus, is a canal that leads from the pinna (the outer ear) to the tympanic membrane (eardrum). It is about 1 inch (2.5 cm) long and is lined with skin that contains hair and cerumen (earwax).
What are the two primary functions of the external auditory meatus in the outer ear?
The two primary functions of the external auditory meatus are:
- To collect sound waves: The external auditory meatus collects sound waves and directs them to the tympanic membrane.
- To protect the tympanic membrane: The external auditory meatus helps to protect the tympanic membrane from dirt, water, and other foreign objects.
What is the physiology of the external auditory meatus?
The physiology of the external auditory meatus is complex. The skin lining the canal contains hair and cerumen, which help to protect the tympanic membrane from dirt and water. The canal is also lined with glands that secrete mucus, which helps to keep the canal moist.
What is the difference between external and internal auditory meatus?
The external auditory meatus is the canal that leads from the pinna to the tympanic membrane. The internal auditory meatus is a canal that leads from the inner ear to the brainstem. The internal auditory meatus contains the vestibulocochlear nerve, which is responsible for hearing and balance.
Conclusion
The external auditory meatus is an important part of the ear. It helps to collect sound waves and protect the tympanic membrane. The physiology of the external auditory meatus is complex, and it is lined with hair, cerumen, and mucus to help protect the ear.