Anterior olfactory nucleus

Anterior olfactory nucleus

Human brainstem anterior view (Anterior olfactory nucleus is not labeled, but region is visible at center top, approximately between the "2" and the "3".)
Latin nucleus olfactorius anterior
NeuroNames hier-262
NeuroLex ID Anterior olfactory nucleus
TA A14.1.09.416
FMA 77628

Anatomical terms of neuroanatomy

The anterior olfactory nucleus (AON; also called the anterior olfactory cortex) is a portion of the forebrain of vertebrates.

It is involved in olfaction [1] and has supposedly strong influence on other olfactory areas like the olfactory bulb and the piriform cortex.[2]


The AON is found behind the olfactory bulb and in front of the piriform cortex (laterally) and olfactory tubercle (medially) in a region often referred to as the olfactory peduncle or retrobulbar area. The peduncle contains the AON as well as two other much smaller regions, the taenia tecta (or dorsal hippocampal rudiment) and the dorsal peduncular cortex.


The AON plays a pivotal but relatively poorly understood role in the processing of odor information.

Odors enter the nose (or olfactory rosette in fishes) and interact with the cilia of olfactory receptor neurons. The information is sent via the olfactory nerve (Cranial Nerve I) to the olfactory bulb. After the processing in the bulb the signal is transmitted caudally via the axons of mitral and tufted cells in the lateral olfactory tract. The tract forms on the ventrolateral surface of the brain and passes through the AON, continuing on to run the length of the piriform cortex, while synapsing in both regions. 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. Therefore, the AON is positioned to regulate information flow between nearly every region where odor information processing occurs.


The AON is composed of two separate structures:


  1. Saiz-Sanchez D, Ubeda-Bañon I, de la Rosa-Prieto C, et al. (June 2009). "Somatostatin, tau, and beta-amyloid within the anterior olfactory nucleus in Alzheimer disease". Exp. Neurol. 223 (2): 347–350. doi:10.1016/j.expneurol.2009.06.010. PMID 19559700.
  2. Peter C. Brunjes; Kurt R. Illig; Elizabeth A. Meyer (2005). "A field guide to the anterior olfactory nucleus (cortex)". Brain Research Reviews. doi:10.1016/j.brainresrev.2005.08.005.

External links

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