Extrinsic Back Muscles - Intermediate Layer

Question 1

Serratus posterior superior (197)

2O, 1I, 1N, 1A

Answer 1

SA:
+ nuchal ligament
+ spinous processes of C7-T3

IA:
+ superior borders of 2nd-4th ribs

N:
+ 2nd-5th intercostal nerves

A:
+ elevates ribs

Question 2

Serratus posterior inferior

1O, 1I, 2N, 1A

Answer 2

SA:
+ inferior borders of 8th-12th ribs near their angles

IA:
+ spinous processes of T11-L2

N:
+ 9th-11th intercostal nerves
+ subcostal nerve (T12)

A:
+ depresses ribs