MRI brain scan showing smell centres in colour

MRI brain scan showing smell centres in colour

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Credit: BSIP DUCLOUX/SCIENCE PHOTO LIBRARY

Caption: Smell centres. Coloured Magnetic Resonance Imaging (MRI) brain scan showing smell centres in the human brain. The perception of smell starts in the nasal mucosa inside the nose, where tiny hair-like receptor nerve cells detect chemical stimuli. Activated receptor cells transmit messages to the olfactory bulb, just over the nasal cavity. This analyses the input signal and then sends a message via the olfactory tract to smell centres in the brain. These include the olfactory centre in the hippocampus (red), and the thalamus (yellow). Also seen here is the cerebrum (folded part of brain at top), cerebellum (centre right) and brainstem (below red mark).

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Keywords: anatomy, brain, human body, mri, neuroimaging, nose, olfaction, olfactory, olfactory system, sense, smell, smell centres

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