Intermediate Back Muscles

Question 1

Serratus posterior superior:

1. Origin of muscle
2. Insertion of muscle
3. Action of muscle
4. Innervation of muscle

Answer 1

Origin:

1. Lower part of the ligamentum nuchae, aka the nuchal ligament
2. C7-T3

Insertion: Ribs 2-5

Action: Elevates ribs 2-5

Innervation: Intercostal nerves

Question 2

Serratus posterior inferior:

1. Origin of muscle
2. Insertion of muscle
3. Action of muscle
4. Innervation of muscle

Answer 2

Broad and strong. (Under lats)

Origin: T11-L3

Insertion: ribs 9-12

Action: Depresses ribs 9-12

Innervation: Intercostal nerves