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View of the brain from below: The transversely running, light-colored fibers between the two halves of the brain (b, c, p, q, r, x, w) are called commissure fibers.
c = Genu corporis callosi;
b = Rostrum corporis callosi;
t = dentate gyrus ;
x = commissura fornicis (hippocampi);
w = Commissura posterior
(drawing by Johann Christian Reil )

A commissure ( Latin commissura , joint, connection ) is a connection between the two sides of a common structure in anatomy .

In neuroanatomy , commissures are transverse connections that cross the median plane between corresponding structures in the right and left halves of the brain or spinal cord . The nerve tracts that run in them are called commissural neurons . Examples of commissure systems in the brain are the corpus callosum (also called commissura magna or bar), the commissura fornicis , the commissura anterior (commissura rostralis) and the commissura posterior (commissura caudalis or epithalamica) or the commissura habenularum . At the level of the spinal cord, the commissura alba anterior connects the two anterior strands and the commissura alba posterior between the posterior strands. Both run in the white matter in front of or behind the gray substantia intermedia centralis . Between the two lies within the central zone of the gray matter of the spinal cord ( lamina X ) in front of the central canal the commissura grisea anterior and behind this the commissura grisea posterior .

In the rope ladder nervous system (nervous system of lower animals), cross connections between the segmentally arranged nerve bundles ( ganglia ) are called commissures.

Individual evidence

  1. Alfred Benninghoff , Kurt Goerttler : Textbook of Human Anatomy. Shown with preference given to functional relationships. Volume 3: Nervous System, Skin and Sensory Organs . 7th edition. Urban and Schwarzenberg, Munich 1964, pp. 16 f., 20, 22 f., 114, 191, 202, 205, 239.