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The structures that guard the nostrils and ear canals, preventing particles from entering is called guard hairs or vibrissa.
The nostril is either of the two orifices located on the nose and used as a passage for air and other gases to travel the nasal passages.
The ear canal is the tube or meatus running from the outer ear to the eardrum through which sound enters.
These two locations are very tender and delicate, which indicates that they need extreme protection from danger.
Also, since they are tubes or passage areas to the internal parts of the body, they require protection to prevent foreign particles from entering.
Therefore, the structures that guard the nostrils and ear canals, preventing particles from entering is called guard hairs or vibrissa.
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