| A | B |
|---|
| axis | 1st palpable spinous |
| C3 | hyoid bone |
| C4 | cephalad part of thyroid cartilage- larynx |
| C5 | caudad part of thyroid cartilage |
| C6 | last moveable spinous in flexion and extension |
| tranverse process of TP C6 | cricoid cartilage |
| C7 | vertebral prominens (70%) |
| T1 | vertebral prominens (30%) |
| T3 | spine of scapula |
| T4-T5 | sternal angle (2nd rib) angle of louis |
| T6 | inferior angle of scapula lying down |
| T7 | inferior angle of scapula upright |
| L4 | iliac crest |
| S2 | PSIS |
