from Section I - Neurology, Neurophysiology and Neuropsychology: Olfactory Clues to Brain Development and Disorder
Published online by Cambridge University Press: 17 August 2009
Introduction
There was a time in the history of anatomy and medicine when the temporal lobes were considered to be the olfactory brain. In an early paper describing a patient with a brain tumor and olfactory auras, Jackson and Beevor (1889a) refer to the ‘anterior tip of the temporo-sphenoidal lobe’ as the ‘pyriform or hippocampal lobule’ (p. 350). They also mention that Broca had described this part of the brain as being well developed in animals with a keen sense of smell, and as being rudimentary in animals with poorer smelling. Since then, our understanding of temporal-lobe function has evolved greatly. We know that the temporal lobes are heterogeneous structures consisting of several subregions, and that this complex set of structures participates in a wide variety of cognitive and emotional functions and behaviors. However, the old wisdom that the temporal lobes have a great importance in olfaction is still valid, and in this chapter, we review the main findings elucidating this relationship.
A brief overview: anatomy and uniqueness of the olfactory system
In most senses, the primary sensory area consists of one region, and adjacent areas usually constitute the secondary sensory regions. In olfaction, however, a whole series of structures constitutes the primary olfactory cortex (POC), and interestingly, some of these structures are not cortical. Carmichael et al. (1994) listed eight principal structures that constitute the POC in the macaque monkey, and a similar composition can be assumed in humans: the anterior olfactory nucleus, the ventral tenia tecta, the piriform cortex, the olfactory tubercle, the periamygdaloid cortex, the nucleus of the lateral olfactory tract of the amygdala, the anterior cortical nucleus of the amygdala and the rostral entorhinal cortex.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.