Rule of 3's

Question 1

Briefly Describe Rule of 3s

Answer 1

Starting at T4, For each group of 3, the transverse processes move up.

• First group on level (T1-3)
• Second group 1/2 step UP
• 3rd group 1 full step UP
• each vertebra thereafter reverses the order per rib

Question 2

According to Rule of 3s, where is the transverse process for T10?

Answer 2

-With the spinous process of T9

It follows T7-T9 and should be located at the level of the spinous process of the vertebrae above

Question 3

According to Rule of 3s, where is the transverse process for T11?

Answer 3

-1/2 step above T10

It follows T4-6 and should be located 1/2 segment above the corresponding spinous process

Question 4

According to Rule of 3s, where is the transverse process for T12?

Answer 4

It follows T1-3 and should be located at the level of its spinous process