Back mm 2

Question 1

Serratus Posterior Superior

Answer 1

Intermediate Layer
Extrinsic
O: SPs of C7-T6
I: superior border of ribs 2-5, near the angles
Action: elevates the ribs in inspiration
INNE: Thoracic intercostal nn. (T2-T5)

Question 2

Serratus Posterior Inferior

Answer 2

Intermediate layer
Extrinsic
O: SPs of T11-L2
I: inferior border of ribs 8-12
Action: depresses ribs in expiration
INNE: (T9-T12)