The squamous epithelium throughout the external auditory canal is unique in its ability to self-clean. Instead of friction removing the desquamated epithelium and the keratin debris, as occurs elsewhere on the body, the ear canal is cleaned by the actual migration of squamous epithelium. Squamous epithelial cells of the tympanic membrane move radially toward the annulus and then continue in a lateral direction, from the annulus to the meatus. Any condition that disrupts this normal migration pattern or the production of the protective secretions will predispose individuals to disease. An extreme example of this is the repair of aural atresia with the creation of an ear canal lined by a split-thickness skin graft (STSG) taken from another area of the body.
A simple squamous epithelium is a single layer of flat cells in contact with the basal lamina (one of the two layers of the basement membrane) of the epithelium. This type of epithelium is often permeable and occurs where small molecules need to pass quickly through membranes via filtration or diffusion.
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Answer:
The squamous epithelium throughout the external auditory canal is unique in its ability to self-clean. Instead of friction removing the desquamated epithelium and the keratin debris, as occurs elsewhere on the body, the ear canal is cleaned by the actual migration of squamous epithelium. Squamous epithelial cells of the tympanic membrane move radially toward the annulus and then continue in a lateral direction, from the annulus to the meatus. Any condition that disrupts this normal migration pattern or the production of the protective secretions will predispose individuals to disease. An extreme example of this is the repair of aural atresia with the creation of an ear canal lined by a split-thickness skin graft (STSG) taken from another area of the body.
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Answer:
A simple squamous epithelium is a single layer of flat cells in contact with the basal lamina (one of the two layers of the basement membrane) of the epithelium. This type of epithelium is often permeable and occurs where small molecules need to pass quickly through membranes via filtration or diffusion.
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