Intermediate Intrinsic Back Muscles

Question 1

Where does the iliocostalis cervicis originate and insert?

Answer 1

originates at ribs 3-7 and inserts on the transverse process of C4-C6

Question 2

Where does the iliocostalis thoracis originate and insert?

Answer 2

originates at ribs 7-12 and inserts on ribs 1-6

Question 3

Where does the iliocostalis lumborum originate and insert?

Answer 3

originates at iliac crest, sacrum, and thoracolumbar fascia and inserts at ribs 6-12, deep layer of thoracolumbar fascia, and transverse process of upper lumbar vertebra

Question 4

What innverates the iliocostalis muscles?

Answer 4

spinal nerve C8-L1

posterior rami

Question 5

What are the actions of the iliocostalis?

Answer 5

bilaterally–> extends spine

unilaterally –> laterally flex to same side

Question 6

What are the intermediate intrinsic back muscles?

Answer 6

iliocostalis (cervicis, thoracis, lumborum)
longissimus (capitas, cervicis, thoracis)
spinalis (cervicis, thoracis)