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Chiasm
Chiasm may refer to: * ''Chiasm'' (musical project), an electronic music project by Emileigh Rohn * Chiasm (anatomy), an X-shaped structure produced by the crossing over of the fibers, with the prefix chiasm- means cross examples include: ** A nerval chiasm, where either two nerves cross in the body midline (e.g. Optic chiasma) ** A crossing of fibres inside a nerve reversing their mapping ** A tendinous chiasm, the spot where two tendons cross. The tendon of the flexor digitorum longus muscle forms two: the crural chiasm (with the tendon of the tibialis posterior muscle) and the plantar chiasm (with the tendon of the flexor hallucis longus muscle). * Chiasma (genetics) In genetics, a chiasma (pl. chiasmata) is the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomes. At a given chiasma, an exchange of genetic material can occur between both chromatids, what ..., the point where two chromatids are intertwined (interwoven) in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiasm (anatomy)
In anatomy a chiasm is the spot where two structures cross, forming an X-shape (). This can be: * A ''tendinous chiasm'' is the spot where two tendons cross. For example, the tendon of the flexor digitorum superficialis muscle, and the tendon of the flexor digitorum longus muscle which even forms two chiasms. * In neuroanatomy, a chiasm is the crossing of fibres of a nerve or the crossing of two nerves. Very different types of crossings of nerves are referred to as chiasm: * Type I : Two nerves can ''cross one over the other'' (sagittal plane) without fusing, e.g., the trochlear nerve (see figure). * Type II :Two nerves can ''merge'' while at least part of the fibres cross the midline (see figure 2). * Type III : The fibres ''within'' a single nerve cross, such that the order of the functional map is reversed, e.g., the optic chiasms of various invertebrates such as insects and cephalopods. * Type IV : A torsion or loop by 180 degrees of a nerve can also reverse the order ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optic Chiasma
In neuroanatomy, the optic chiasm, or optic chiasma (; , ), is the part of the brain where the optic nerves cross. It is located at the bottom of the brain immediately inferior to the hypothalamus. The optic chiasm is found in all vertebrates, although in cyclostomes (lampreys and hagfishes), it is located within the brain. This article is about the optic chiasm of vertebrates, which is the best known nerve chiasm, but not every chiasm denotes a crossing of the body midline (e.g., in some invertebrates, see Chiasm (anatomy)). A midline crossing of nerves inside the brain is called a decussation (see Definition of types of crossings). Structure For the different types of optic chiasm, see In all vertebrates, the optic nerves of the left and the right eye meet in the body midline, ventral to the brain. In many vertebrates the left optic nerve crosses over the right one without fusing with it. In vertebrates with a large overlap of the visual fields of the two eyes, i.e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiasmus
In rhetoric, chiasmus ( ) or, less commonly, chiasm (Latin term from Greek , "crossing", from the Greek , , "to shape like the letter Χ"), is a "reversal of grammatical structures in successive phrases or clauses – but no repetition of words". A similar device, antimetabole, also involves a reversal of grammatical structures in successive phrases or clauses in an A-B-B-A configuration, but unlike chiasmus, presents a repetition of words. Examples Chiasmus balances words or phrases with similar, though not identical, meanings: "Dotes" and "strongly loves" share the same meaning and bracket, as do "doubts" and "suspects". Additional examples of chiasmus: For comparison, the following is considered antimetabole, in which the reversal in structure involves the same words: Both chiasmus and antimetabole can be used to reinforce antithesis. In chiasmus, the clauses display inverted parallelism. Chiasmus was particularly popular in the literature of the ancient worl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiasmus
In rhetoric, chiasmus ( ) or, less commonly, chiasm (Latin term from Greek , "crossing", from the Greek , , "to shape like the letter Χ"), is a "reversal of grammatical structures in successive phrases or clauses – but no repetition of words". A similar device, antimetabole, also involves a reversal of grammatical structures in successive phrases or clauses in an A-B-B-A configuration, but unlike chiasmus, presents a repetition of words. Examples Chiasmus balances words or phrases with similar, though not identical, meanings: "Dotes" and "strongly loves" share the same meaning and bracket, as do "doubts" and "suspects". Additional examples of chiasmus: For comparison, the following is considered antimetabole, in which the reversal in structure involves the same words: Both chiasmus and antimetabole can be used to reinforce antithesis. In chiasmus, the clauses display inverted parallelism. Chiasmus was particularly popular in the literature of the ancient worl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiasma (genetics)
In genetics, a chiasma (pl. chiasmata) is the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomes. At a given chiasma, an exchange of genetic material can occur between both chromatids, what is called a chromosomal crossover, but this is much more frequent during meiosis than mitosis. In meiosis, absence of a chiasma generally results in improper chromosomal segregation and aneuploidy. Points of crossing over become visible as chiasma after the synaptonemal complex dissembles and the homologous chromosomes slightly apart from each other. The phenomenon of genetic chiasmata (''chiasmatypie'') was discovered and described in 1909 by Frans Alfons Janssens, a Professor at the University of Leuven in Belgium. When each tetrad, which is composed of two pairs of sister chromatids, begins to split, the only points of contact are at the chiasmata. The chiasmata become visible during the diplotene stage of prophase I of meiosis, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiasm (musical Project)
Emileigh Rohn is a solo artist who produces the electronic music project ''Chiasm'' sold by COP International records. She has released five albums; ''Disorder'', ''Relapse'', ''Reform,'' ''11:11, and Reset''. Her music has been featured on many compilation CDs, in the PC video game '' Vampire: The Masquerade – Bloodlines'' by Troika Games, on the CBS television series ''NCIS'' and in the independent film ''Extinguish'' released by Outsider Filmworks. The name ''Chiasm'' ( Greek χίασμα, "crossing") comes from the biology term of the crossing of optic neurons in the brain that allow people to have continuous and peripheral vision (see Optic chiasm). ''Chiasm'' is produced in Detroit, MI United States. Origin At the age of five, Emileigh Rohn began taking piano lessons from her church organist, Mildred Benson, and eventually began singing solos in church. By the age of 13 she received a Casiotone keyboard and began experimenting with electronic music. In her final y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flexor Digitorum Longus Muscle
The flexor digitorum longus muscle is situated on the tibial side of the leg. At its origin it is thin and pointed, but it gradually increases in size as it descends. It serves to flex the second, third, fourth, and fifth toes. Structure The flexor digitorum longus muscle arises from the posterior surface of the body of the tibia, from immediately below the soleal line to within 7 or 8 cm of its lower extremity, medial to the tibial origin of the tibialis posterior muscle. It also arises from the fascia covering the tibialis posterior muscle. The fibers end in a tendon, which runs nearly the whole length of the posterior surface of the muscle. This tendon passes behind the medial malleolus, in a groove, common to it and the tibialis posterior, but separated from the latter by a fibrous septum, each tendon being contained in a special compartment lined by a separate mucous sheath. The tendon of the tibialis posterior and the tendon of the flexor digitorum longus cross each ot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiasmus (cipher)
Chiasmus is a secret German government block cipher that was leaked by reverse engineering. It became notorious for its dilettant use in the BSI's software GSTOOL, which used it in insecure Electronic Codebook (ECB) mode and generated the key with a pseudo random number generator initialized to the current system time, which means an effective key length that can easily be broken by brute force. The BSI tried to prevent the publication of these findings with legal threats. Chiasmus seems to be resistant against the most common cryptographic attacks (linear and differential cryptanalysis), but a lot slower than the openly available state of the art ciphers such as AES. See also * Libelle (cipher) * Skipjack (cipher) In cryptography, Skipjack is a block cipher—an algorithm for encryption—developed by the U.S. National Security Agency (NSA). Initially classified, it was originally intended for use in the controversial Clipper chip. Subsequently, the algor ... Refere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiasmetes
''Chiasmetes'' is a genus of beetles in the family Cerambycidae. It is monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ..., being represented by the single species, ''Chiasmetes limae''.Bezark, Larry GA Photographic Catalog of the Cerambycidae of the World. Retrieved on 22 May 2012. References Prioninae {{Prioninae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
