where are the olfactory receptor neurons are located
Olfactory receptor neuron An olfactory receptor neuron (ORN), also called an olfactory sensory neuron (OSN), is a transduction cell within the olfactory system.[2]
Olfactory receptor In vertebrates, the olfactory receptors are located in both the cilia and synapses of the olfactory sensory neurons[4] and in the epithelium of the human airway.[5]  In insects, olfactory receptors are located on the antennae and other chemosensory organs.[6] Sperm cells also express odor receptors, which are thought to be involved in chemotaxis to find the egg cell.[7]
Small intestine Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.
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