medullary

/med-l-er-ee, mej-uh-ler-ee, muh-duhl-uh-ree/US // ˈmɛd lˌɛr i, ˈmɛdʒ əˌlɛr i, məˈdʌl ə ri //

髓质,髓部,髓质的,髓质部

Definitions

adj.形容词 adjective

1
- : pertaining to, consisting of, or resembling the medulla of an organ or the medulla oblongata.

He noticed the medullary rays, for which he uses the expressive term "Insertions."
This is probably to be explained by the growth of the medullary fold at this point, which pushes back the primitive groove.
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 medullary folds are also flatter and broader than in the previous section.
These, though they cannot be considered as entirely the cause of the medullary groove, may perhaps help to make it deeper.