Anterior commissure

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Brain: Anterior commissure
Coronal section of brain through anterior commissure. (Label for "anterior commissure" is on left, third from bottom.)
The hypophysis cerebri in position. Shown in sagittal section. (Caption for anterior commissure is at center top.)
Latin commissura anterior
Gray's subject #189 840
NeuroNames hier-187
Dorlands/Elsevier c_49/12251560


The Anterior Commissure (precommissure) is a bundle of white fibers, connecting the two cerebral hemispheres across the middle line, and placed in front of the columns of the fornix.

On a sagittal section, it is oval in shape, having a long vertical diameter that measures about 5 mm.

In 1991 brain studies performed by Laura Allen and Roger Gorsky of UCLA noted that the Anterior Commissure was found to be 1/3 larger in men with a homosexual orientation.[1]


Its fibers can be traced laterally and backwards on either side beneath the corpus striatum into the substance of the temporal lobe.

It serves in this way to connect the two temporal lobes, but it also contains decussating fibers from the olfactory tracts, and is a part of the neospinothalamic tract for pain.

See also


  1. LeVay S (1991). "A difference in hypothalamic structure between heterosexual and homosexual men". Science. 253 (5023): 1034–7. PMID 1887219.

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External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.