About: Chiasm (anatomy)

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In anatomy a chiasm is the spot where two structures cross, forming an X-shape (from Greek letter χ, Chi). 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:

Attributes	Values
rdf:type	Thing wikidata:Q4936952 anatomical structure brain
rdfs:label	Chiasm (anatomy) (en)
rdfs:comment	In anatomy a chiasm is the spot where two structures cross, forming an X-shape (from Greek letter χ, Chi). 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: (en)
differentFrom	Decussation Commissure Ganglion
foaf:name	Chiasm (en) chiasma (en)
name	Chiasm (en)
foaf:depiction
dcterms:subject	Soft tissue Optic nerve Peripheral nervous system Neuroanatomy Nerves
Wikipage page ID	62697627 (xsd:integer)
Wikipage revision ID	1064769210 (xsd:integer)
Link from a Wikipage to another Wikipage	Camera obscura Nerve Birds Soft tissue Retina Decussation Anatomical terms of neuroanatomy Optic nerve Peripheral nervous system Chi (letter) Chiasmal syndrome Chiasmatic groove Nucleus (neuroanatomy) Optic tectum Contralateral brain Optic tract Mammals Neuroanatomy Axons Neuroanatomy Cephalopod eye Cephalopods Ganglion Loligo Agnatha Anatomical terms of location Anatomy Amniotes Central nervous system Superior colliculus Optic radiation Hagfish Invertebrates Cranial nerves Tendons Nerves Lamprey Superior oblique muscle Homology (biology) Trochlear nerve Axon Squids Insect morphology Insects Midbrain Octopuses Optic chiasm Neural circuit Oculomotor nerve Flexor digitorum longus muscle Flexor digitorum superficialis muscle Motor nerve Thalamus Sagittal plane Muscles Ventral Vertebrates Ramón y Cajal
sameAs	Chiasm (anatomy) Chiasm (anatomy)
dbp:wikiPageUsesTemplate	dbt:Cranial_nerves dbt:Infobox_brain dbt:! dbt:Authority_control dbt:Distinguish dbt:For dbt:Main dbt:Reflist dbt:Short_description dbt:Ety dbt:Wikibooks-inline
thumbnail	wiki-commons:Special:FilePath/FigChiasmSchema.png?width=300
caption	Schema of the optic chiasm and the trochlear chiasm in vertebrates. (en)
has abstract	In anatomy a chiasm is the spot where two structures cross, forming an X-shape (from Greek letter χ, Chi). 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 of the functional map. This type is usually not referred to as chiasm. Note that in the third type there is no crossing of the mid sagittal plane. Only in the first type, the crossing is complete. There are other kinds of crossings of nerve fibres. The chiasm is distinguished from a decussation, which is a crossing of nerve fibres inside the central nervous system. A chiasm also differs from a ganglion in that axons run through it without making any synapses. A chiasm is thus not a nervous processing centre. (en)
function	Anatomical feature where two structures cross (en)
Latin	chiasma (en)

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