Pseudostratified columnar epithelia – trachea

“Pseudostratified” is a term applied to epithelia that appear to be stratified (i.e., have nuclei at various levels), but in which all component cells reach the base of the epithelium and are attached to the underlying basement membrane.  The basement membrane looks like a pink line at the base of the epithelium. (adapted from U Mich Histology)

Virtual microscopy (link). Pseudostratified epithelia from trachae. The cilia appear as hairlike projections at the cell apex.

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