(redirected from Posterior commissure)
Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to Posterior commissure: fornix, pretectal nucleus, commissura posterior


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.


1. (Biology) a band of tissue linking two parts or organs, such as the nervous tissue connecting the right and left sides of the brain in vertebrates
2. (Biology) any of various joints between parts, as between the carpels, leaf lobes, etc, of a plant
[C15: from Latin commissūra a joining together, from committere commit]
commissural adj


(ˈkɒm əˌʃʊər, -ˌʃɜr)

1. a joint or seam where two parts meet, as in a bone.
2. a connecting bundle of nerve fibers, esp. one joining the right and left sides of the brain.
[1375–1425; late Middle English (< Middle French) < Latin commissūra=commiss(us) (see commissary) + -ūra -ure]
com•mis•su•ral (kəˈmɪʃ ər əl, ˌkɒm əˈʃʊər əl, -ˈʃɜr-) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.commissure - a bundle of nerve fibers passing from one side to the other of the brain or spinal cord
nerve pathway, nerve tract, pathway, tract - a bundle of myelinated nerve fibers following a path through the brain
corpus callosum - a broad transverse nerve tract connecting the two cerebral hemispheres


n. comisura, punto de unión de estructuras tal como la unión de los labios.
References in periodicals archive ?
A videolaryngoscopic examination showed a 5x5 mm polypoid mass at the posterior commissure (Figure 1).
Abbreviations: AC = anterior commissure, ACA = anterior cerebral artery, ahPCG = arm-hand region of precentral gyrus, BRRC = Brain Rehabilitation Research Center, CIMT = constraint-induced movement therapy, CT = computed tomography, DTT = diffusion tensor tractographic, fMRI = functional magnetic resonance imaging, MAL = Motor Activity Log, MCA = middle cerebral artery, MRI = magnetic resonance imaging, PC = posterior commissure, PVWM = periventricular white matter, SD = standard deviation, UL = upper limb, VA = Department of Veterans Affairs.
The supraglottic index (SGI) uses a scale to score for the presence of edema and erythema /hyperemia in the epiglottis, false vocal cords, and arytenoid cartilage, as well as secretions or mucosal thickening of the piriform recess and posterior commissure.

Full browser ?