©2020 by The Goofy Anatomist

2.10.3. Serratus Posterior (Both Parts)
bonesintro.jpg

Overview

Tap/click to enlarge

The diagram shown here depicts the serratus posterior muscles. The diagram has been sketched from the perspective of an anatomist standing behind the subject. As such, you can see the posterior aspect of the vertebral column and the scapula on each side.

Serratus posterior superior

  • Origin: Lower C vertebrae and upper T vertebrae spinous processes.

  • Insertion: Upper ribs.

  • Nerve supply: Intercostal nerves.

  • Action: Raises ribs and therefore aids in inspiration.

Serratus posterior inferior

  • Origin: Upper L vertebrae and lower T vertebrae spinous processes.

  • Insertion: Lower ribs.

  • Nerve supply: Intercostal nerves.

  • Action: Depresses (lowers) ribs and therefore aids in expiration.

Additional Notes

If the thorax is the first anatomy module that you study, you will probably not need to remember the origins, insertions, etc, off by heart - at the least appreciate where the muscles lie and that they assist in forced respiration.