neural crest

n. The part of the ectoderm in a vertebrate embryo that lies on either side of the neural tube and develops into the cranial, spinal, and autonomic ganglia.

neu′ral crest′

n. a group of ectodermal cells of the embryo that develop into a variety of tissues, including spinal and autonomic ganglia, connective tissue around the brain and spinal cord, and parts of the facial bones. [1880–85]

Neural Crest

Neural crest

A strip of ectodermal material in the early vertebrate embryo inserted between the prospective neural plate and epidermis. After closure of the neural tube the crest cells migrate into the body and give rise to parts of the neural system: the main part of the visceral cranium, the mesenchyme, the chromaffin cells, and pigment cells. The true nature of the neural crest eluded recognition for many years because this primary organ has a temporary existence; its cells and derivatives are difficult to analyze when dispersed throughout the body. The fact that mesenchyme arises from this ectodermal organ was directly contrary to the doctrine of the specificity of the germ layers.

Neural crest no doubt exists, with similar qualities, in all vertebrate groups, including the cyclostomes. It has been most thoroughly studied in amphibians and the chick. See Germ layers

Neural Crest

the fold of ectoderm that borders the neural, or medullary, plate during neurulation in chordates and man. The cells of the neural crest become distributed over the neural tube after neurulation, forming the ganglionic primordia. The neural crest gives rise to the spinal and sympathetic ganglia, the visceral skeleton, the pigment cells, and the connective tissue layer of the skin.

neural crest

[′nu̇r·əl ′krest] (embryology) Ectoderm composing the primordium of the cranial, spinal, and autonomic ganglia and adrenal medulla, located on either side of the neural tube.

neural crest

neu·ral crest

neuroectodermal cells that originate in the dorsal aspect of the neural folds or neural tube. These cells leave the neural tube or folds and differentiate into various cell types including posterior-root ganglion cells; autonomic ganglion cells; the chromaffin cells of the suprarenal medulla; Schwann cells; sensory ganglia cells of cranial nerves V, IX, and X; part of the meninges; or integumentary pigment cells. Synonym(s): ganglion ridge, ganglionic crest

neural crest

n. The part of the ectoderm in a vertebrate embryo that lies on either side of the neural tube and develops into the cranial, spinal, and autonomic ganglia.

neu·ral crest

(nūr'ăl krest) A band of neuroectodermal cells along either side of the line of closure of the embryonic neural groove; with the formation of the neural tube, these bands come to lie dorsolateral to the developing spinal cord and lateral to the brainstem, where they separate into clusters of cells that develop into, for example, spinal ganglion cells, autonomic ganglion cells, the chromaffin cells of the suprarenal medulla, Schwann cells, sensory ganglia of cranial nerves V, VII, VIII, IX, and X, part of the meninges, or integumentary pigment cells.

neural crest

the ridge of ectoderm occurring directly above the neural tube in the development of the vertebrate embryo; it gives rise to the PERIPHERAL nervous system.

单词	neural crest
释义	neural crest neural crest n. The part of the ectoderm in a vertebrate embryo that lies on either side of the neural tube and develops into the cranial, spinal, and autonomic ganglia. neu′ral crest′ n. a group of ectodermal cells of the embryo that develop into a variety of tissues, including spinal and autonomic ganglia, connective tissue around the brain and spinal cord, and parts of the facial bones. [1880–85] Neural Crest Neural crest A strip of ectodermal material in the early vertebrate embryo inserted between the prospective neural plate and epidermis. After closure of the neural tube the crest cells migrate into the body and give rise to parts of the neural system: the main part of the visceral cranium, the mesenchyme, the chromaffin cells, and pigment cells. The true nature of the neural crest eluded recognition for many years because this primary organ has a temporary existence; its cells and derivatives are difficult to analyze when dispersed throughout the body. The fact that mesenchyme arises from this ectodermal organ was directly contrary to the doctrine of the specificity of the germ layers. Neural crest no doubt exists, with similar qualities, in all vertebrate groups, including the cyclostomes. It has been most thoroughly studied in amphibians and the chick. See Germ layers Neural Crest the fold of ectoderm that borders the neural, or medullary, plate during neurulation in chordates and man. The cells of the neural crest become distributed over the neural tube after neurulation, forming the ganglionic primordia. The neural crest gives rise to the spinal and sympathetic ganglia, the visceral skeleton, the pigment cells, and the connective tissue layer of the skin. neural crest [′nu̇r·əl ′krest] (embryology) Ectoderm composing the primordium of the cranial, spinal, and autonomic ganglia and adrenal medulla, located on either side of the neural tube. neural crest neu·ral crest neuroectodermal cells that originate in the dorsal aspect of the neural folds or neural tube. These cells leave the neural tube or folds and differentiate into various cell types including posterior-root ganglion cells; autonomic ganglion cells; the chromaffin cells of the suprarenal medulla; Schwann cells; sensory ganglia cells of cranial nerves V, IX, and X; part of the meninges; or integumentary pigment cells. Synonym(s): ganglion ridge, ganglionic crest neural crest n. The part of the ectoderm in a vertebrate embryo that lies on either side of the neural tube and develops into the cranial, spinal, and autonomic ganglia. neu·ral crest (nūr'ăl krest) A band of neuroectodermal cells along either side of the line of closure of the embryonic neural groove; with the formation of the neural tube, these bands come to lie dorsolateral to the developing spinal cord and lateral to the brainstem, where they separate into clusters of cells that develop into, for example, spinal ganglion cells, autonomic ganglion cells, the chromaffin cells of the suprarenal medulla, Schwann cells, sensory ganglia of cranial nerves V, VII, VIII, IX, and X, part of the meninges, or integumentary pigment cells. neural crest the ridge of ectoderm occurring directly above the neural tube in the development of the vertebrate embryo; it gives rise to the PERIPHERAL nervous system. FinancialSeeCrestThesaurusSeecrest
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