Back Muscle Groups

Question 1

What are the two classifications of back muscles?

Answer 1

EXTRINSIC GROUP
- upper limb movement and respiration

INTRINSIC GROUP
- superficial, intermediate (erector spine) and deep layers
- maintain posture
- control movement of the vertebral column

Question 2

what is the movement of muscles anterior to the spine?

Answer 2

Flexion (bilateral)

Question 3

what is the movement of muscles posterior to the spine?

Answer 3

Extension (bilateral) eg erector spinae

Question 4

What is the relationship between the erector spinae and the vertebral column?

Answer 4

• Extension of VC (bilaterally)
• Lateral flexion of VC (unilaterally)