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- More specifically, neurons of the gracile and cuneate nuclei send projections that decussate as the internal arcuate fibers and ascend as the medial lemniscus to synapse inthe ventroposterolateral nucleus of the thalamus.
WordNet
- cross or intersect so as to form a cross; "this nerve decussates the other"; "the fibers decussate"
- crossed or intersected in the form of an X (同)intersectant, intersecting
- (of a leaf shape) narrowly triangular, wider at the apex and tapering toward the base (同)wedge-shaped
- slender and graceful (同)willowy
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/09/01 19:31:45」(JST)
[Wiki en表示]
Section of the medulla oblongata at the level of the decussation of the pyramids.
Decussation is used in biological contexts to describe a crossing. (In Latin anatomical terms the form decussatio is used, e.g. decussatio pyramidum) In anatomy the term chiasma or chiasm means nearly the same as decussation.[1]
Examples include:
- In the brain, where nerve fibers obliquely cross from one lateral part to the other, that is to say they cross at a level other than their origin. See for example Decussation of pyramids. Decussation describes the point where the nerves cross from one side of the brain to the other, and typically the nerves from the left side of the body decussate to the right side of the brain and the nerves from the right side of the body decussate to the left brain, however depending on the function of the nerves the level of decussation is variable.
- In botanical leaf taxology, decussate describes an opposite pattern of leaves which has successive pairs at right angles to each other. (Rotated 90 degrees along the stem when viewed from above). In effect, successive pairs of leaves cross each other. The Basil herb is a classic example of a decussate leaf pattern.
Decussate phyllotaxis of
Crassula rupestris
- In tooth enamel, where bundles of rods cross each other as they travel from the enamel-dentine junction to the outer enamel surface, or near to it.
Evolutionary significance
After the origin of the nervous system, in the course of evolution from invertebrate to vertebrate, the nerve cord moved from the ventral side (side towards the belly) to the dorsal side (side towards the back). It is believed that in this process, the decussation arose with a 180° shift with respect to the brain.[2][3]
See also
References
- ^ Stedman, Thomas Lathrop. A practical medical dictionary. Publisher: New York, W. Wood 1920. May be downloaded at http://archive.org/details/cu31924052393315
- ^ Kinsbourne, M (Sep 2013). "Somatic twist: a model for the evolution of decussation.". Neuropsychology 27 (5): 511–5. doi:10.1037/a0033662. PMID 24040928.
- ^ Dixon, A. Francis (31 May 2014). "Why are the great motor and sensory tracts of the central nervous system crossed?". The Dublin Journal of Medical Science 124 (1): 1–4. doi:10.1007/BF02972358.
- Further reading
- Why does the nervous system decussate?: Stanford Neuroblog
UpToDate Contents
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- 1. 瞳孔不同患者へのアプローチ approach to the patient with anisocoria
- 2. 同名半盲 homonymous hemianopia
English Journal
- Uncrossed epileptic seizures in Joubert syndrome.
- López Ruiz P1, García García ME1, Dicapua Sacoto D1, Marcos-Dolado A1.
- BMJ case reports.BMJ Case Rep.2015 May 22;2015. pii: bcr2014207719. doi: 10.1136/bcr-2014-207719.
- Joubert syndrome and related disorders comprise a subgroup of ciliopathies defined by the presence of the 'molar tooth sign', a midbrain-hindbrain malformation identifiable by neuroimaging. Characteristically, the corticospinal tract and superior cerebellar peduncles do not decussate. Epileptic seiz
- PMID 26002775
- High-Resolution Diffusion Tensor Imaging and Tractography in Joubert Syndrome: Beyond Molar Tooth Sign.
- Hsu CC1, Kwan GN1, Bhuta S2.
- Pediatric neurology.Pediatr Neurol.2015 Mar 5. pii: S0887-8994(15)00116-2. doi: 10.1016/j.pediatrneurol.2015.02.027. [Epub ahead of print]
- BACKGROUND: Diffusion tensor imaging analysis of brainstem fiber tracts in two Joubert syndrome patients.METHODS: Two Joubert syndrome patients underwent magnetic resonance imaging brain examination with diffusion tensor imaging. Imaging findings were compared with five age- and sex-matched control
- PMID 25890865
- Conserved patterns of axogenesis in the panarthropod brain.
- Boyan G1, Williams L2, Liu Y2.
- Arthropod structure & development.Arthropod Struct Dev.2015 Mar;44(2):101-12. doi: 10.1016/j.asd.2014.11.003. Epub 2014 Dec 4.
- Neuropils in the cerebral midline of Panarthropoda exhibit a wide spectrum of neuroarchitectures--from rudimentary to highly elaborated--and which at first sight defy a unifying neuroarchitectural principle. Developmental approaches have shown that in model arthropods such as insects, conserved cell
- PMID 25483803
- Complete mitochondrial genome of leaf coral Pavona decussata (Scleractinia, Agariciidae).
- Shi X1, Lin R, Zheng X, Liu X, Niu W.
- Mitochondrial DNA.Mitochondrial DNA.2015 Jan 29:1-2. [Epub ahead of print]
- Abstract The leaf coral Pavona decussate is a wide-spread shallow-water species of genus Pavona within Agariciidae. In our study, the entire mitochondrial nucleotide sequence of P. decussate was determined. The sequence was 18,378 bp in length and contained 13 protein-coding genes, 2 ribosomal RNA
- PMID 25630728
Japanese Journal
- カラスビシャクの栽培に関する研究(第1報) : 種子形成について
- 樋口 正視,岡田 稔
- 生薬學雜誌 49(3), 269-278, 1995-09-20
- … The pollen tetrads are isobilateral, decussate and T-shaped. …
- NAID 110008731606
- 下部白亜系銚子層群産, Cupressinocladus obatae, sp. nov.
- 大久保 敦,木村 達明
- Bulletin of the National Science Museum. Series C, Geology & paleontology 17(3), 91-109, 1991-09
- … A new species, Cupressinocladus obatae is proposed for the pinnately branched coniferous shoots with decussate opposite scale-leaves, collected from the Lower Cretaceous Choshi Group of marine origin, in the Outer Zone of Japna. …
- NAID 110004312302
- On the mechanism of decussate phyllotaxis : Biophysical studies on the tunica layer of Vinca major.
Related Links
- decussateとは。意味や和訳。[動] 〔dikseit〕 (他)(自)…を[が]X字形に交差させる[する]. [形] 〔dikseit, -sit〕 X字形の, 交差した；〈葉が〉十字対生の.de・cus・sa・tion〔digrave;ksein〕[名] - goo辞書は国語、英和、和英 ...
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- in four vertical rows: decussate leaves. Origin: Latin decussāre, decussāt-, from decussis, the number ten, intersection of two lines (from the Romans' use of X for the numeral 10), a ten-as coin: decem, ten; see dekm ...