Structure and Location - The AON is located behind the olfactory bulb and in front of the piriform cortex and olfactory tubercle. - It is part of the olfactory peduncle or retrobulbar area. - The AON is accompanied by two smaller regions, the taenia tecta and dorsal peduncular cortex. - The peduncle contains the AON and these additional regions. - The AON is positioned to regulate information flow between various regions involved in odor processing.

Function - The AON plays a crucial but poorly understood role in odor information processing. - Odors interact with the cilia of olfactory receptor neurons in the nose. - The olfactory nerve transmits the information to the olfactory bulb. - Signal processing occurs in the bulb, and the signal is then transmitted through the lateral olfactory tract. - The AON distributes the information to the contralateral olfactory bulb and piriform cortex, as well as engaging in reciprocal interactions with the ipsilateral bulb and cortex.

Components - The AON consists of two distinct structures: the pars externa and pars principalis. - The pars externa is a thin ring of cells encircling the rostral end of the olfactory peduncle. - The pars principalis is a two-layered structure seen in coronal sections of mammalian brains. - Layer II of the pars principalis is a thick ring of pyramidal and other-shaped cells surrounding the anterior limb of the anterior commissure. - Layer Ia and Layer Ib make up the outer layer of the pars principalis.

References - Saiz-Sanchez et al. (2009) studied somatostatin, tau, and beta-amyloid in the anterior olfactory nucleus in Alzheimer's disease. - Brunjes et al. (2005) published a field guide and review on the anterior olfactory nucleus/cortex. - BrainInfo provides information on the anterior olfactory nucleus. - Cranial Nerves, a resource from Yale School of Medicine, contains archived information on the topic.

External Links - Cranial Nerves is a resource from Yale School of Medicine. - The original source for Cranial Nerves is archived. - The BrainInfo website provides information on the anterior olfactory nucleus. - Saiz-Sanchez et al. (2009) published a study on the anterior olfactory nucleus in Alzheimer's disease. - Brunjes et al. (2005) published a field guide and review on the anterior olfactory nucleus/cortex.