Olfactory epithelium in the nose (human)

Electron microscopy. At the top (lumen) cross-sections of olfactory bulbs (1) (vesicles) with cilia/basal bodies. Sustentacular (supporting) cells (2) exhibit numerous microvilli in the lumen, their cytoplasms contain many dispersed mitochondria and in the lower half aggregations of endoplasmic reticulum. In the middle partially a slender cytoplasm of an olfactory cell (3) filled with an accumulation of mitochondria (note that the ultrastructure is not optimal due to biopsy procedures)