Intra-epithelial glands in human eustachian tube.
D004847:Epithelial Cells; D005064:Eustachian Tube / Q000033:anatomy & histology* / Q000166:cytology; D005088:Exocrine Glands / Q000033:anatomy & histology* / Q000166:cytology; D006801:Humans; D009093:Mucus