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]

Contents

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.

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

Superficial dissection of brain-stem. Lateral view.

Deep dissection of brain-stem. Lateral view.

Superficial dissection of brain-stem. Ventral view.

Mesal aspect of a brain sectioned in the median sagittal plane.

Median sagittal section of brain.

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 As such, some of the information contained herein may be outdated.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.

 This neuroscience article is a stub. You can help Wikipedia by expanding it.
v • d • e
Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres)
Primary sulci/fissures Medial longitudinal, Lateral, Central, Parietoöccipital, Calcarine, Cingulate, Callosal Collateral fissure
Frontal lobe Precentral gyrus (Primary motor cortex, 4), Precentral sulcus, Superior frontal gyrus/Frontal eye fields (6, 8, 9), Middle frontal gyrus (46), Inferior frontal gyrus (44-Pars opercularis, 45-Pars triangularis), Orbitofrontal cortex (10, 11, 12, 47)
Parietal lobe Somatosensory cortex (Primary (1, 2, 3, 43), Secondary (5)), Precuneus (7m), Parietal lobules (Arcuate fasciculus/Superior (7l), Inferior (40)), Angular gyrus (39), Intraparietal sulcus, Marginal sulcus
Occipital lobe Primary visual cortex (17), Cuneus, Lingual gyrus, 18, 19 - Lateral occipital sulcus
Temporal lobe Primary auditory cortex (41, 42), Superior temporal gyrus (38, 22), Middle temporal gyrus (21), Inferior temporal gyrus (20), Fusiform gyrus (37) Medial temporal lobe (Amygdala, Hippocampus, Parahippocampal gyrus (27, 28, 34, 35, 36)
Cingulate cortex/gyrus Subgenual area (25), anterior cingulate (24, 32, 33), Posterior cingulate (23, 31), Retrosplenial cortex (26, 29, 30), Supracallosal gyrus
white matter tracts Corpus callosum (Splenium, Genu, Rostrum, Tapetum), Septum pellucidum, Internal capsule, Corona radiata, External capsule, Olfactory tract, Fornix (Commissure of fornix), Anterior commissure, Posterior commissure Terminal stria Superior and Inferior longitudinal fasciculus, uncinate fasciculus, cingulum, Inferior occipitofrontal fasciculus
Basal ganglia Striatum (Putamen,Caudate nucleus, Nucleus accumbens), Globus pallidus, Claustrum, Subthalamic nucleus, Substantia nigra
Other Insular cortex Olfactory bulb, Anterior olfactory nucleus Septal nuclei Basal optic nucleus of Meynert
Some categorizations are approximations, and some Brodmann areas span gyri.
v • d • e
White matter fibers
Association fibers Uncinate fasciculus - Cingulum - Superior longitudinal fasciculus/Arcuate fasciculus - Inferior longitudinal fasciculus - Inferior occipitofrontal fasciculus - Fornix
Commissural fibers Corpus callosum - Anterior commissure - Posterior commissure - Commissure of fornix
Projection fibers (none named)
Retrieved from "http://en.wikipedia.org/wiki/Anterior_commissure"
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