red bone marrow

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Related to medulla ossium rubra: medulla ossium flava

red bone mar·row

[TA]
bone marrow in which the stroma primarily contain the developmental stages of erythrocytes, leukocytes, and megakaryocytes; it is present throughout the skeleton during fetal life and at birth. After the fifth postnatal year, it is gradually replaced in the long bones by yellow marrow.
Synonym(s): medulla ossium rubra [TA]

red bone marrow

n.
Bone marrow in which the meshes of the reticular network contain the developmental stages of red blood cells, white blood cells, and megakaryocytes.