Intermediate Extrinsic Back Muscles

Question 0

longissimus

Answer 0

O: broad tendon from post part of iliac crest, post surface of sacrum, sacroiliac ligaments, sacral and inf lumbar spinous processes, supraspinous ligament
I: ribs b/w tubercles and angles, T and C transverse processes, mastoid process
N: post rami of spinal nerves
A: bilaterally– extend vertebral column and head
unilaterally– lateral flexion of vertebral column

Question 1

Iliocostalis

Answer 1

O: broad tendon from post part of iliac crest, post surface of sacrum, sacroiliac ligaments, sacral and inf lumbar spinous processes, supraspinous ligament
I: angles of lower ribs and C transverse processes
N: post rami of spinal nerves
A: bilaterally– extend vertebral column and head
unilaterally– lateral flexion of vertebral column

Question 2

spinalis

Answer 2

O: broad tendon from post part of iliac crest, post surface of sacrum, sacroiliac ligaments, sacral and inf lumbar spinous processes, supraspinous ligament
I: spinous processes in upper T region and cranium
N: post rami of spinal nerves
A: bilaterally– extend vertebral column and head
unilaterally– lateral flexion of vertebral column