The<unk> , also known as the first cranial<unk> , cranial<unk>  I, or simply CN I, is a cranial<unk>  that contains sensory<unk>  fibers relating to the sense of smell. The afferent<unk>  fibers of the<unk>  receptor neurons transmit<unk>  impulses about odors to the central<unk> us system (olfaction). Derived from the embryonic nasal placode, the<unk>  is somewhat unusual among cranial<unk> s because it is capable of some regeneration if damaged. The<unk>  is sensory in nature and originates on the<unk>  mucosa in the upper part of the nasal cavity. From the<unk>  mucosa, the<unk>  (actually many small<unk>  fascicles) travels up through the cribriform plate of the ethmoid bone to reach the surface of the brain. Here the fascicles enter the<unk>  bulb and synapse there; from the bulbs (one on each side) the<unk>  information is transmitted into the brain via the<unk>  tract. The fascicles of the<unk>  are not visible on a cadaver brain because they are severed upon removal.
Olfactory nerve
Olfactory trigone
Olfactory tract
Ciliary ganglion
Oculomotor nerve
Optician
Stellate ganglion
Buccal branches of the facial nerve