Linked from
The 14 pages that link to Olfactory bulb, each with the reason it gives.
OlfactionRelated: It is the first major brain relay for smell signals.
Olfactory nerveRelated: This is the nerve’s destination, where its axons synapse in glomeruli.
HyposmiaRelated: Disruption of this first brain relay can weaken odor perception.
Sense of smellRelated: It is the first major brain station for incoming olfactory signals.