MEDULLARY

medullary. Medullary, a. pertaining to marrow, pithy, soft

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Med″ul‐la‐ry (?), a. [[L. medullaris, fr. medulla marrow: cf. F. médullaire.]] 1. 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata.
2. 2. (Bot.) Filled with spongy pith; pithy.
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.