thorax and true muscles

Question 1

where does serratus posterior superior attach?

Answer 1

superior: nuchal ligament and spinous process C7-T3.
inferior: superior borders of 2-4 ribs.

Question 2

what is the action of serratus posterior inferior? which nerve supplies this muscle?

Answer 2

action: proprioception and depresses ribs.
innervation: T9-12 thoracic spinal nerves.

Question 3

where does serratus posterior inferior attach?

Answer 3

superior: spinous processes T11-L2.
inferior: inferior border of 8-12 ribs.

Question 4

what is the action of serratus posterior superior? and which nerve supplies the muscle?

Answer 4

action: proprioception and elevates ribs.
innervation: 2-5th intercostal nerves.