The direction of resorption of the maxillary ridge is:
The maxilla resorbs in a superioposterior direction, and the mandible resorbs in an inferioanterior direction.

This will lead to confinement of maxillary arch within the mandibular arch in longstanding edentulous situations, giving a pseudo-class III ridge relationship.
Downwards and buccally
Upwards and lingually
Downwards and lingually
Upwards and buccally