Flagella.
Or, are you talking about cilia?
actin filaments
cell is smallest organ of all living organism we can't see cell through the neck eye. I think you are refering to the cilia of a cell.
Flagellum or Flagella
cilia
a wisdom tooth beginning to protrude
Cilia
The flagella protrude from cell's surface and enable movement of the cell. Many single celled eukaryotes use flagella for movement.
what is do not protrude below the level of foramen magnum
The noun for the verb "to protrude" is "protrusion".
Protrude is a verb. It means to extend beyond or stick out from a surface.
The ribs protrude from the body after the fall.
Protrude is extension or bulge its antonym is Recess(break out)