Intermediate Layer Of Intrinsic Back Muscles (erector spinae)

Question 0

Iliocoastalis insertion

Answer 0

Angles of lower ribs and cervical transverse processes

Question 1

Erector spinae origin

Answer 1

Broad ligament of posterior part of iliac crest, posterior surface of sacrum, sacro-iliac ligaments, sacral and inferior lumbar spinous processes, and supraspinous ligament

Question 2

Longissimus insertion

Answer 2

Between tubercles and angles of ribs in thoracic and cervical regions, and mastoid process

Question 3

Spinalis insertion

Answer 3

Spinous processes in upper thoracic region and to cranium

Question 4

Erector spinae main actions

Answer 4

Acting bilaterally: extend vertebral column and head

Acting unilaterally: laterally flex vertebral column