Medullary rays

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 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.

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