The primitive pit is a depression in the center of the primitive node, connecting to the notochord. It consists of part of the primitive streak.
Famous quotes containing the words primitive and/or pit:
“The most primitive places left with us are the swamps, where the spruce still grows shaggy with usnea.”
—Henry David Thoreau (1817–1862)
“The great snake lies ever half awake, at the bottom of the pit of the world, curled
In folds of himself until he awakens in hunger and moving his head to right and to left prepares for his hour to devour.”
—T.S. (Thomas Stearns)