Meanings of medullary furrow in English

In its axis is seen the dorsal furrow or medullary furrow (a).

As the reader will remember, the straight medullary furrow first appears in the middle of the sandal-shaped embryonic shield.

On its dorsal side we find in the middle line the straight medullary furrow, bordered by the two parallel dorsal or medullary swellings.

This is even clearer a little later, when the medullary furrow is closed into the nerve-tube (Figure 1.93 mr).

Hence the primitive groove (Figure 1.128 pr), examined from above, appears to be the straight continuation of the fore-lying and younger medullary furrow (me).

Medullary furrow still wide open behind (z).

Medullary furrow still wide open from x; greatly widened at z. mp medullary plates, sp lateral plates, y limit of gullet-cavity (sh) and fore-gut (vd).