Definition of Olfactory bulb

Olfactory bulb: A key part of the olfactory apparatus consisting of a bulbous enlargement of the end of the olfactory nerve on the under surface of the frontal lobe of each cerebral hemisphere just above the nasal cavity. Called also Morgagni's tubercle.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=39584
Last Editorial Review: 6/14/2012