An Forgotten Purpose of Serratus Anterior
Prepared on August 31, 2021 at 7:33 am, by Eric Cressey
Serratus anterior receives:
1. A large amount of like as a scapular protractor
2. Some adore as a scapular upward rotator
3. Even fewer like as a posterior tilter of the scapula
4. Just about zero appreciate for its effect on rib inner/exterior rotation.
Most importantly, you are going to see that the higher fibers of the serratus anterior attach on the first rib – the incredibly bone which is eliminated for the duration of thoracic outlet operation.
Images by Anatomography – en:Anatomography (placing webpage of this graphic), CC BY-SA 2.1 jp, https://commons.wikimedia.org/w/index.php?curid=27010000
When the serratus fires, it depresses the initial rib and clears house below the clavicle for essential nerve and vascular constructions to move.
If you get a next to feel about it when hunting at the anatomy charts beneath, you are going to appreciate that this attachment effectively can make serratus anterior an antagonist to the scalenes and subclavius, which each elevate the first rib.
This is one particular cause why a whole lot of the thoracic outlet syndrome cases you are going to face are not your traditional kyphotic (hunchback) posture, but basically a great deal of flat thoracic backbone, major scapular downward rotation/despair, and horizontal clavicle shows.
Obtaining serratus anterior heading favorably impacts scapular upward rotation (which provides the clavicle up), to start with rib positioning, and the ideal convex-concave partnership involving the rib cage and scapula.
Enjoyment simple fact: serratus anterior also indirectly impacts contralateral thoracic rotation, but that’s a submit for another working day!
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