Occipital and/or cervical extra-oral anchorage is used to
1. restrict anterior tooth movement.
2. enhance maxillary forward growth.
3. enhance mandibular forward growth.
4. encourage anterior tooth movement.
5. restrict maxillary forward growth.

(1) and (5)

(1) and (3)

(2) and (4)

(3) and (5)

(2) and (3)