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- الحبل العصبي الظهري هو أحد الخصائص الجنينية الفريدة للحبليات بجانب الحبل الظهري. يعتبر الحبل العصبي الظهري حبل ظهري أجوف. ويتكون من جزء من الأديم الظاهر الملفوف، مشكلا أنبوب مجوف، مقارنة مع شعب الحيوانات الأخرى التي لديها أنابيب بطنية صلبة. يتغير الحبل العصبي الظهري في وقت لاحق في الفقاريات إلى النظام العصبي المركزي الذي يتكون من المخ والحبل الشوكي. يوجد الحبل العصبي الظهري بشكل أساسي في شعيبة الفقاريات. (ar)
- The dorsal nerve cord is a unique feature to chordates, and it is mainly found in the Vertebrata chordate subphylum. The dorsal nerve cord is only one embryonic feature unique to all chordates, among the other four chordate features-- a notochord, a post-anal tail, an endostyle, and pharyngeal slits. The dorsal hollow nerve cord is a hollow cord dorsal to the notochord. It is formed from a part of the ectoderm that rolls, forming the hollow tube. This is important, as it distinguishes chordates from other animal phyla, such as Annelids and Arthropods, which have solid, ventral tubes. The process by which this is performed is called invagination. The cells essentially convolute into the body cavity, arranging themselves on the dorsal plane above the notochord, as mentioned above. The evolutionary explanation to this adaptation from a solid cord to hollow tube is unknown. In vertebrates, the dorsal nerve cord is modified into the central nervous system, which comprises the brain and spinal cord. Dorsal means the "back" side, as opposed to ventral which is the "belly" side of an organism.In bipedal organisms dorsal is the back and ventral is the front.In organisms which walk on four limbs the dorsal surface is the top (back) and the ventral surface is the bottom (belly). (en)
- Gné uathúil do chordaigh is ea an néarchorda droma, agus tá sé le fáil go príomha sa bhfofhíleam Vertebrata de chuid na gCordach. Níl sa néarchorda droma ach gné shuthach amháin atá uathúil do na cordaigh go léir. I measc na gceithre ghné eile sna cordaigh tá nótacorda, eireaball iaranasach, , agus scoilteanna faraingeacha. Is corda toll ar chúl an nótacorda é an néarchorda droma. Tá sé déanta as cuid den a rollaítear, agus a chruthaíonn an feadán toll. Tá sé seo tábhachtach, ós rud é go ndéanann sé idirdhealú ar chordaigh ó fhílim ainmhithe eile, mar shampla anailidí agus artrapóid, a bhfuil feadáin sholadacha tarracha acu. Tugtar ionfhaighniú ar an bpróiseas trína ndéantar é seo. é . (ga)
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- الحبل العصبي الظهري هو أحد الخصائص الجنينية الفريدة للحبليات بجانب الحبل الظهري. يعتبر الحبل العصبي الظهري حبل ظهري أجوف. ويتكون من جزء من الأديم الظاهر الملفوف، مشكلا أنبوب مجوف، مقارنة مع شعب الحيوانات الأخرى التي لديها أنابيب بطنية صلبة. يتغير الحبل العصبي الظهري في وقت لاحق في الفقاريات إلى النظام العصبي المركزي الذي يتكون من المخ والحبل الشوكي. يوجد الحبل العصبي الظهري بشكل أساسي في شعيبة الفقاريات. (ar)
- Gné uathúil do chordaigh is ea an néarchorda droma, agus tá sé le fáil go príomha sa bhfofhíleam Vertebrata de chuid na gCordach. Níl sa néarchorda droma ach gné shuthach amháin atá uathúil do na cordaigh go léir. I measc na gceithre ghné eile sna cordaigh tá nótacorda, eireaball iaranasach, , agus scoilteanna faraingeacha. Is corda toll ar chúl an nótacorda é an néarchorda droma. Tá sé déanta as cuid den a rollaítear, agus a chruthaíonn an feadán toll. Tá sé seo tábhachtach, ós rud é go ndéanann sé idirdhealú ar chordaigh ó fhílim ainmhithe eile, mar shampla anailidí agus artrapóid, a bhfuil feadáin sholadacha tarracha acu. Tugtar ionfhaighniú ar an bpróiseas trína ndéantar é seo. é . (ga)
- The dorsal nerve cord is a unique feature to chordates, and it is mainly found in the Vertebrata chordate subphylum. The dorsal nerve cord is only one embryonic feature unique to all chordates, among the other four chordate features-- a notochord, a post-anal tail, an endostyle, and pharyngeal slits. The dorsal hollow nerve cord is a hollow cord dorsal to the notochord. It is formed from a part of the ectoderm that rolls, forming the hollow tube. This is important, as it distinguishes chordates from other animal phyla, such as Annelids and Arthropods, which have solid, ventral tubes. The process by which this is performed is called invagination. The cells essentially convolute into the body cavity, arranging themselves on the dorsal plane above the notochord, as mentioned above. The evolut (en)
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- حبل عصبي ظهري (ar)
- Dorsal nerve cord (en)
- Néarchorda droma (ga)
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