The fibres of the olfactory nerve are actually the central processes of the olfactory cells rather than peripheral processes of a central group of ganglion cells.
The nerve fibres originate in the bipolar olfactory cells of the nasal mucosa and subsequently join to form approximately 20 bundles which pass through the cribriform plate of the ethmoid to terminate by synapsing with mitral cells in the olfactory bulb. Axons pass back from the mitral cells to the cortex of the uncus whereupon the final path becomes uncertain.
Figure CA.20 Brachial plexus
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