commissural
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com·mis·sur·al
(kom'i-syūr'ăl),Relating to a commissure.
Farlex Partner Medical Dictionary © Farlex 2012
com·mis·sur·al
(kom-i-shŭr'ăl)Relating to a commissure.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
commissure
(kom'i-shur?) [ commissura]1. In the central nervous system, an axon tract that crosses the midline (sagittal) plane between two homologous and symmetric structures, e.g., the corpus callosum, which interconnects the right and left cerebral cortices.
2. The meeting of two structures, as the lips, eyelids, or labia, across the midline (sagittal) plane. commissural (kom?i-shur'al), adjective
anterior commissure
A symmetric axon tract running transversely through the lamina terminalis and connecting the right and left temporal cortices.
commissure of the fornix
Hippocampal commissure.Gudden inferior commissure
See: Gudden inferior commissurehabenular commissure
A group of decussating axons of the stria medullaris. The stria medullaris contains axons projecting to the habenula from the septal nuclei, the preoptic hypothalamus, and the anterior thalamic nuclei; those stria medullaris axons that project to the contralateral habenula cross the midline plane via the habenular commissure.
hippocampal commissure
A thin sheet of axons from the fornix that cross the midline plane under the posterior sector of the corpus callosum and interconnect homologous fields of the right and left hippocampi.
Synonym: commissure of fornixMeynert commissure
See: Meynert commissurepalpebral commissure
The union of the upper and lower eyelids at each end of the palpebral fissure.
posterior commissure
An axon tract running transversely through the gray matter that forms the roof of the cerebral aqueduct in the midbrain. This tract contains commissural axons interconnecting the right and left pretectal areas; it also contains decussating axons from each pretectal area to the contralateral Edinger-Westphal nucleus.
posterior commissure of spinal cord
The gray commissure connecting the halves of the spinal cord, lying behind the central canal.
tectal commissure
A symmetric axon tract running transversely through the ventral tectum of the midbrain and interconnecting the right and left superior colliculi.
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