Olfactory Organ. the organ in man and animals that receives chemical stimuli that are interpreted as smells. The sense of smell is technically known as olfaction.In man the olfactory organ is the superoposterior area of the nasal cavity, including part of the nasal septum and the two turbinate bones, which protrude from the lateral walls of the cavity.The entire olfactory organ is covered by the olfactory epithelium, whose surface area is about 5 cm 2.he spindle-shaped olfactory receptor cells, which are located in the olfactory organs, are the functional units of the olfactory apparatus.