The phrase
"neck cavity" refers to the hollow space inside the neck area.
Full definition
Put 1/2 cup vegetable mixture
inside neck cavity and 1/2 cup inside chest cavity of turkey.
Starting
at neck cavity, loosen skin from breast and drumsticks by inserting fingers, gently pushing between skin and meat.
Starting at
the neck cavity, loosen skin from breast and drumsticks by inserting fingers, gently pushing between skin and meat.
Remove and discard the fat just inside the body and
neck cavities.
If you've never done this before, flip the bird so it is breast - side - down and from
the neck cavity, cut along one side of the backbone.