Medullary groove
Medullary Med"ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m['e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster]

2. (Bot.) Filled with spongy pith; pithy. [1913 Webster]

{Medullary groove} (Anat.), a groove, in the epiblast of the vertebrate blastoderm, the edges of which unite, making a tube (the medullary canal) from which the brain and spinal cord are developed.

{Medullary rays} (Bot.), the rays of cellular tissue seen in a transverse section of exogenous wood, which pass from the pith to the bark.

{Medullary sheath} (Anat.), the layer of white semifluid substance (myelin), between the primitive sheath and axis cylinder of a medullated nerve fiber. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • medullary groove — n NEURAL GROOVE * * * neural g …   Medical dictionary

  • medullary groove — noun or medullary furrow : the median dorsal longitudinal groove formed in the vertebrate embryo by the medullary plate after appearance of the neural folds called also neural groove …   Useful english dictionary

  • Medullary — Med ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m[ e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster] 2. (Bot.) Filled with spongy pith;… …   The Collaborative International Dictionary of English

  • Medullary rays — Medullary Med ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m[ e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster] 2. (Bot.) Filled with… …   The Collaborative International Dictionary of English

  • Medullary sheath — Medullary Med ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m[ e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster] 2. (Bot.) Filled with… …   The Collaborative International Dictionary of English

  • medullary canal — noun or medullary cavity 1. : medullary groove 2. : the marrow cavity of a bone …   Useful english dictionary

  • medullary furrow — noun see medullary groove …   Useful english dictionary

  • groove — A narrow, elongate depression or furrow on any surface. SEE ALSO: sulcus. alveolobuccal g. the upper and lower half of the buccal vestibule on each side. SYN: alveolobuccal sulcus, gingivobuccal g., gingivobuccal sulcus. alveololabial g. 1. the… …   Medical dictionary

  • medullary streak — neural groove …   Medical dictionary

  • neural groove — n the median dorsal longitudinal groove formed in the vertebrate embryo by the neural plate after the appearance of the neural folds called also medullary groove * * * the groove produced by the invagination of the neural plate of the embryo… …   Medical dictionary

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