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| | mucous membrane -- Encyclopædia Britannica |
 | | Mucous membranes line many tracts and structures of the body, including the mouth, nose, eyelids, windpipe and lungs, stomach and intestines, and the ureters, urethra, and urinary bladder. |
 | | membrane in the human ear that receives sound vibrations from the outer air and transmits them to the auditory ossicles, which are tiny bones in the tympanic (middle ear) cavity. |
 | | The thin, semitransparent tympanic membrane, or eardrum, which forms the boundary between the outer and middle ear, is stretched obliquely across the end of the external canal. |
| www.britannica.com /eb/article-9054122 (742 words) |
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