Infraspinatus: Difference between revisions
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[[Category:Anatomy]] [[Category:Muscles]] [[Category:Musculoskeletal/Orthopaedics|Orthopaedics]] [[Category:Shoulder]] [[Category:Shoulder - Anatomy]] [[Category:Anatomy | [[Category:Anatomy]] [[Category:Muscles]] [[Category:Musculoskeletal/Orthopaedics|Orthopaedics]] [[Category:Shoulder]] [[Category:Shoulder - Anatomy]] [[Category:Shoulder - Anatomy]] [[Category:Shoulder - Muscles]] | ||
Revision as of 16:12, 29 August 2019
Original Editor - Wendy Walker
Lead Editors - Kate Sampson, Kim Jackson, Wendy Walker, Lilian Ashraf, Oyemi Sillo, WikiSysop, Aya Alhindi, 127.0.0.1, Naomi O'Reilly and George Prudden
Description[edit | edit source]
A thick, triangular muscle; one of the 4 muscles which comprise the Rotator Cuff of the shoulder.
Origin[edit | edit source]
The infraspinatus fossa of scapula, with some fibres arising from the infraspinatous fascia which covers the muscle and separates it from Teres Major and Teres Minor.[1]
Insertion[edit | edit source]
The posterior aspect of greater tuberosity of humerus, and the capsule of shoulder joint.[2]
Nerve Supply[edit | edit source]
Suprascapular Nerve (C5 & C6)[3]
Blood Supply[edit | edit source]
Suprascapular and circumflex scapular arteries.[3]
Action[edit | edit source]
Infraspinatus is the main external rotator of the shoulder joint.
It assists in producing shoulder extension.
With the arm fixed, it abducts the inferior angle of the scapula. [2]
Function[edit | edit source]
It provides the primary muscle force for external rotation of the shoulder.
Along with the rest of the Rotator Cuff muscles it provides stability to the shoulder complex.[3]
Resources[edit | edit source]
References
[edit | edit source]
- ↑ Gray H. Anatomy of the Human Body. Philadelphia: Lea & Febiger, 1918. Available from https://www.bartleby.com/107/123.html (accessed on 29/2/2016)
- ↑ 2.0 2.1 Wheeles CR. Infraspinatus. Available from: http://www.wheelessonline.com/ortho/infraspinatus (last accessed 29/2/2016)
- ↑ 3.0 3.1 3.2 AnatomyExpert. 3D Infraspinatus- infraspinatus. Available from: http://www.anatomyexpert.com/app/structure/5510/554/ (last accessed on 29/2/2016)
