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Definition

The spongy substance of bone that is initially formed after the replacement of cartilage, and consists of mineralized tissue, marrow and cartilage.

Supplement

Word origin: from Latin spongia, from Greek spongiā, from spongos; bone.

Related forms: primary spongiosum.

Synonym: primary trabecula.
Compare: secondary spongiosa.
See also: spongiosa.