medullary

[ med-l-er-ee, mej-uh-ler-ee, muh-duhl-uh-ree ]

/ ˈmɛd lˌɛr i, ˈmɛdʒ əˌlɛr i, məˈdʌl ə ri /

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adjective

pertaining to, consisting of, or resembling the medulla of an organ or the medulla oblongata.

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Origin of medullary

First recorded in 1610–20; medull(a) + -ary

post·med·ul·lar·y, adjective

He noticed the medullary rays, for which he uses the expressive term "Insertions."
Makers of British Botany; a collection of biographies by living botanists|Various
This is probably to be explained by the growth of the medullary fold at this point, which pushes back the primitive groove.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
So that it is clear that the medullary streak is not the notochord, as was thought to be the case by the authors above mentioned.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
The medullary folds are also flatter and broader than in the previous section.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour

These, though they cannot be considered as entirely the cause of the medullary groove, may perhaps help to make it deeper.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour