Layer 3 Back Muscles

Question 1

Which muscles are in the third layer of the back?

Answer 1

Serratus posterior superior and inferior

Question 2

What is the origin of serratus posterior superior?

Answer 2

Nuchal L and spinous processes C7-T3

Question 3

What is the insertion for serratus posterior superior?

Answer 3

Superior surface of ribs 2-4

Question 4

What is the serratus posterior superior muscle’s actions?

Answer 4

Elevate ribs with forced inspiration (primarily proprioceptive)

Question 5

What is the serratus posterior superior muscle Innervated by?

Answer 5

Intercostal nerve

Question 6

What is the origin for serratus posterior inferior?

Answer 6

Spinous processes T11-L2

Question 7

What is the insertion for serratus posterior inferior?

Answer 7

Ribs 8-12

Question 8

What is the action of the serratus posterior inferior muscle?

Answer 8

Depress ribs with forced expiration (primarily proprioceptive)

Question 9

What is the serratus posterior inferior muscle innervated by?

Answer 9

Anterior rami T9-12