Mnemonic: BUM BUL BUM
The superior articular process faces:
1. Cervical vertebra: BUM
- Back and Up (45 degrees to transverse plane)
- Medial
2. Thoracic vertebra: BUL
- Back and Up (60 degrees to transverse plane)
- Lateral (20 degrees)
3. Lumbar vertebra: BUM
- Back and Up (90 degrees to transverse plane)
- Medial (45 degrees)