What causes the chalazae to have this spiral direction?

The chalazae, which are the twisted strands of egg white that anchor the yolk in place, have a spiral direction due to the way they form during egg development. As the egg is laid, the proteins in the egg white are secreted in a helical pattern by the hen's oviduct, creating the characteristic spiral shape. This structure helps maintain the yolk's position in the center of the egg, providing stability and protection. The unique spiral formation is a result of the rotational movement of the egg within the hen's reproductive tract during its formation.