Olfactory gland (Bowman) in olfactory region of concha (human)

Electron microscopy. Beneath the olfactory epithelium tubuloalveolar glands of Bowman (1) are found containing cells that produce dense secretion granules arranged around a large lumen (*) with greyish secretion product. These cells produce a serous fluid in which odoriferous substances are dissolved. The continuous secretion of the serous fluid and its movement caused by the sustentacular cells of the olfactory epithelium thus constantly refresh the surface fluid. The proper lamina contains fibroblasts (2) and a small arteriole (3). The serous fluid contains, among others, lysozyme, IgA, odorant binding protein (OBP).