Chalaza

The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus.

A spiral band of thickened albuminous substance which exists in the white of the bird's egg, and serves to maintain the yolk in its position; the treadle.

one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell

basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined