Dissection of thoracic and lumbosacral regions of back from a posterior approach

Components of erector spinae muscle in lower thoracic and lumbar regions

Stanford holds the copyright to the David L. Bassett anatomical images and has assigned Creative Commons license Attribution-Share Alike 4.0 International to all of the images.
For additional information regarding use and permissions, please contact Dr. Drew Bourn at dbourn@stanford.edu.

Image #213-7

Dissection of thoracic and lumbosacral regions of back from a posterior approach

Components of erector spinae muscle in lower thoracic and lumbar regions

Details of the lower part of the specimen shown in view 213-5 are illustrated in this photograph. The lumbar part of the mulitfidus muscle (14) is large and has an extensive origin from the deep surface of the aponeurosis of the erector spinae muscle.

1. Rib X
2. External intercostal muscle
3. Dorsal branch thoracic nerve XI (muscular and cutaneous branches)
4. Iliocostalis lumborum muscle
5. Rib XII
6. Internal oblique muscle (cut across close to origin)
7. Superior cluneal nerves
8. Iliac crest
9. Spinalis thoracis muscle
10. Longissimus thoracis muscle
11. Latissimus dorsi muscle
12. Spinous process vertebra L. II
13. External oblique muscle
14. Multifidus muscle