chalaza

5 large egg yolks, chalazae (cordlike strands of egg white protein that are attached to the yolks) removed with fingers (eliminates need to strain pastry cream after cooking)

T1 plate divided; a dark brown bifurcated suranal plate on A10; primary setae dark brown to black on chalazae, evenly scattered over body segments, head, and over bifurcated suranal plate; spiracles creamy white to light brown.

Eggs and egg capsules were measured prior to first cleavage, and measurements were taken in the plane of the chalazae.

When you tried to pull it out, did attaching muscles cling to it like the chalazae of an egg or the tough strands that fasten a bivalve's body to its shell?

The layers are the chalaziferous layer which is continuous with the chalazae which hold the yolk in place, the inner thin layer, the firm or thick layer and the outer thin layer.