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 (kī-ăz′mə) also chi·asm (kī′ăz′əm)
n. pl. chi·as·ma·ta (-mə-tə) or chi·as·mas also chi·asms
1. Anatomy A crossing or intersection of two tracts, as of nerves or ligaments.
2. Genetics The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.

[Greek khīasma, cross-piece, from khīazein, to mark with an X, from khei, khī, chi (from the letter's shape).]

chi·as′mal, chi·as′mic, chi′as·mat′ic (-măt′ĭk) adj.


relating to the intersection of the optic nerve fibres at the bottom of the brainshowing or characterized by the development of chiasmata
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.chiasmatic - of or relating to a chiasm
anatomy, general anatomy - the branch of morphology that deals with the structure of animals
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References in periodicals archive ?
Use a brain spatula to lightly lift up the frontal lobe base to constantly absorb cerebrospinal fluid (CSF), so as to decrease the brain pressure; further explore the skull base to expose and open chiasmatic cistern, carotid artery cistern to further release CSF, resulting in the collapse of the brain tissue which will incline and leave the skull base under the action of its own gravity, which provides an effective operative space.
We routinely opened the chiasmatic and carotid cisterns before splitting the Sylvian fissure.
As in the panels that deploy the goldsmith's tool--where the indents, while attempting to follow a strict geometrical schema as dictated by the shape of the support, end up as a sequence of wavering lines--in the works (figure 2b) consisting of horizontal lines that follow the impress of a ruler, the ostensibly deductive structure is subtly undermined by the chiasmatic tension between monochromaticism and linearity.
Subtle erosion and expansion of optic canal is better appreciated with CT, while MRI is better in showing intracanalicular, chiasmatic or retrochiasmatic tumour extension.
Meningiomas affecting the visual pathway originate from the basal meninges of tuberculum sellae, planum sphenoidale, chiasmatic sulcus and from diaphragma sellae.
The art illuminates the text, creating an art-prose chiasmatic interchange that ultimately conveys Chico's deep loneliness, within a space filled to the brim with life that teeters at the edge of a precipice threatening a vertiginous drop into nothingness.
Atmospherics pushes us decidedly away from the phenomenological opening between consciousness and thing; however, much intentionality (Husserl), ontotheology (Heidegger) or even chiasmatic flesh (Merleau-Ponty) has tried to bridge it.
The promise of Erian's novel lies in its teasing out of this chiasmatic relationship: its demonstration of how racialized representations of postfeminist female sexual agency and freedom work to mediate and make ordinary the violence of US interventions in the Middle East, even as the ongoing US presence in the Middle East, of which the War on Terror is only the newest iteration, constitutes the condition of possibility for postfeminist self-making and self-management, intimacy, and relationality.
But la petite Fadette is not the only abject creature in Sand's novel, and in looking at Sylvinet, her chiasmatic mirror or twin, we find both similarity and difference in a revealing variant on the themes of Otherness, excess, and identities that transgress society's constructed boundaries.
Marras's clever, chiasmatic inversion contradicted General Idea's enterprise at its core by attacking its fundamental principle of ambiguity.
Being is singularly plural and plurally singular as if Being is or has a certain number of attributes, one of which is that of being singular-plural--however double, contradictory, or chiasmatic this may be" (28).