neural crest(redirected from Ganglion ridge)
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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.
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.
the ectodermally derived cells along the outer surface of each side of the neural tube in the early stages of embryonic development. The cells migrate laterally throughout the embryo and give rise to spinal, cranial, enteric, and sympathetic ganglia; pigment cells; Schwann cells; and the adrenal medulla. Also called ganglionic crest, ganglionic ridge. See also neural tube formation.
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 crestthe ridge of ectoderm occurring directly above the neural tube in the development of the vertebrate embryo; it gives rise to the PERIPHERAL nervous system.
1. a projecting structure or ridge, especially one surmounting a bone or its border.
2. a term describing the upper margin of the neck; root of the mane in a horse.
3. in canaries, a crown of long feathers on the head, all radiating out from a central point; inherited as a dominant trait.
linear thickenings of the walls of the ampullae of the semicircular canals.
the maxillary ridge passing along the alveolar processes of the fetal maxillary bones.
ridges which extend from the epicondyles of the humerus to the shaft.
located on the inside surface of the nasal bones of the pig and dog.
external occipital crest
an extension of the external occipital protuberance to which the ligamentum nuchae is attached.
the prominent crest on the external aspect of the maxilla of horses stretching from beneath the orbit to the middle of the molar teeth. The masseter muscle is attached to its ventral surface.
the thickened cranial border of the ilium of dogs and cats.
the fatty, fibrous tissue above the nuchal ligament which gives the stallion's neck its characteristic elevated contour.
cords of nervous tissue which detaches from the developing spinal cord in the embryo; contribute tissue to the somatic and autonomic ganglia, and many other structures.
the thick, transverse crest on the occipital bone.
a low transverse ridge on the palatine bones.
divides the cranial cavity into cerebellar and cerebral compartments.
the median ridge in the pelvis of many kidneys onto which papillary ducts open.
the mucosal folds in the ruminant reticulum that form the cells of the honeycomb compartments of the walls.
the median crest is the fused dorsal spines of the sacral vertebrae; the lateral sacral crest is the fused articular processes.
the ridge in the middle of the skull which extends forwards from the occipital protuberance; more pronounced in some species, breeds and individuals.
a ridge which runs between the greater and lesser trochanters and forms the caudal wall of the trochanteric fossa.
a longitudinal ridge in the roof of the pelvic urethra formed from two folds of urinary bladder mucosa which fuse after separate origins at the ureteric orifices.
divides the vestibule of the inner ear into the spherical and elliptical recesses.