medullary groove

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a narrow, linear hollow or depression.
branchial groove pharyngeal groove.
Harrison's groove a horizontal groove along the lower border of the thorax corresponding to the costal insertion of the diaphragm; seen in advanced rickets in childhood.
medullary groove (neural groove) that formed by the beginning invagination of the neural plate of the embryo to form the neural tube.
pharyngeal groove a groove between a pair of pharyngeal arches in a mammalian embryo, homologous to the branchial cleft of a fish, formed by rupture of the membrane separating a corresponding entodermal pouch and ectodermal groove.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

neu·ral groove

the gutterlike groove formed in the midline of the embryo's dorsal surface by the progressive elevation of the lateral margins of the neural plate; the ultimate dorsal fusion of the margins results in the formation of the neural tube.
Synonym(s): medullary groove
Farlex Partner Medical Dictionary © Farlex 2012