Back Muscles

Question 1

What are the functions of the back muscles?

Answer 1

Extrinsic - upper limb movement and respiration.
Intrinsic - maintains posture and controls movement of the vertebral column.

Question 2

What are the functions of the bilateral muscles?

Answer 2

Flexion - anterior to the spine.
Rectus abdominis and psaos major.

Extension - posterior to the spine.
Erector spinae.

Question 3

What are the functions of the unilateral muscles?

Answer 3

Rotation - has oblique fibre orientation.
Lateral flexion.
External obliques, internal obliques, and erector spinae.

Question 4

What are the anterior abdominal muscles?

Answer 4

Three large flat muscles with different fibre orientations.
Rectus abdominis, transversus abdominis and obliques.
Anterior flexion, lateral flexion, and rotation of the trunk.

Question 5

What are the posterior abdominal muscles?

Answer 5

The iliacus, psoas major and quadratus.
Anterior flexion (psoas major).
Lateral flexion.