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1. A line or place at which two things are joined.
2. Anatomy
a. A tract of nerve fibers passing from one side to the other of the spinal cord or brain.
b. The point or surface where two parts, such as the eyelids, lips, or cardiac valves, join or form a connection.
3. Botany The surface or place along which two structures, such as carpels, are joined.

[Middle English, from Latin commissūra, from commissus, past participle of committere, to join; see commit.]

com′mis·su′ral adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
In 1929, Pike and colleagues observed spontaneous hind limb recovery after spinal cord hemisection in cats and proposed that "the mechanism which takes over control of movements of the limb lying below the level of the lesion includes motor fibers coming down on the opposite side of the spinal cord, and commissural neurons lying in the spinal cord below the level of the lesion" [21].
Diffusion tensor imaging tractography applied in normal volunteers is able to resolve normal supratentorial fiber tracts (including various association fibers, projection fibers, and commissural fibers).
This study present a right atrioventricular valve bicuspid, whit a clearly septal component with one valvule, and a mural component with a wide anterior valvule and a small anteroseptal commissural cusp.
Also, the PCRF is traversed by an extensive system of commissural fibers that interconnect the vestibular nuclear complexes.
Rheumatic heart disease is characterized by gross commissural fusion, leaflet thickening, and fusion of chordae.
Identification of New Guidance Molecules and Molecular Mechanisms for Spinal Cord Commissural Axon Pathfinding Yimin Zou, Ph.D.
Initially, fEPSPs were monitored in the CA1 region of hippocampal slices from wild-type control mice by electrically stimulating the Schaffer collateral commissural pathway.
Cells in this area secrete diffusible molecules such as SHH and Netrin 1 (NTN1) that are involved in neural tube patterning and guidance of extension of commissural axons [24].
Fukaya et al., "Rac1 in cortical projection neurons is selectively required for midline crossing of commissural axonal formation," European Journal of Neuroscience, vol.
Pulmonary valve dysplasia is characterized by thickened, nodular, and redundant valve leaflets with minimal or no commissural fusion, valve ring hypoplasia, and lack of post-stenotic dilatation of the pulmonary artery13.
[1] In agenesis of corpus callosum, commissural fibers do not cross the midline instead thick bundles of intersecting fibers called Probst bundles which lie along the super medial aspect of the lateral ventricles and the third ventricle may sometimes be displaced upward.
RCA high location + LCA originate from RCA, RCA high location + LCA high location (RCA and LCA origin from the ascending aorta above the commissural or the left sinus of Valsalva together) 0.50 in 76 CCAAs of Uyghur are begin while other 26 are potentially serious, and 77 in 111 CCAAs of Han are begin while other 34 are potentially serious, the difference of "benign" and "potentially serious" CCAAs between Uyghur and Han was not statistically significant ( ?

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