Intermediate Back Muscles (extrinsic & intrinsic)

Question 1

Serratus Posterior Superior

Answer 1

O: Nuchal ligament, Spines C7 - T3

I: Ribs 2 - 5

Inn: Intercostal N.

BS: Posterior Intercostal A.

A: Elevate ribs 2 - 5, Resist respire motion

Question 2

Serratus Posterior Inferior

Answer 2

O: Spines T11 - L3

I: Ribs 8 - 12

Inn: Intercostal N.

BS: Posterior Intercostal A.

A: Depress ribs 8 -12, Resist respire motion

Question 3

Levator Costarum

Answer 3

O: C7 - T11 transverse processes

I: angle of inferior rib

Inn: Dorsal rami of Spinal N.

BS: Posterior Intercostal A.

A: Elevate ribs, resist respire motion

Question 4

Intertransversarii

Answer 4

O: Transverse processes vertebrae

I: transverse processes of adjacent vertebrae

Inn: Dorsal Rami of Spinal N.

BS: Vertebral A. & Posterior Intercostal A.

A: Ipsilateral flex, stabilize vertberal column

Question 5

Interspinales

Answer 5

O: spinous process of vertebrae

I: spinous process of superior vertebrae

Inn: dorsal rami of Spinal N.

BS: Vertebral A & Posterior Intercostal A

A: extend vertebral column, rotate vertebrae