Infraspinatus: Difference between revisions
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== Origin == | == Origin == | ||
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|Teres Minor]].<ref name=" | 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|Teres Minor]].<ref name="p1">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)</ref> | ||
== Insertion == | == Insertion == | ||
The posterior aspect of greater tuberosity of humerus, and the capsule of shoulder joint.<ref name=" | The posterior aspect of greater tuberosity of humerus, and the capsule of shoulder joint.<ref name="p2">Wheeles CR. Infraspinatus. Available from: http://www.wheelessonline.com/ortho/infraspinatus (last accessed 29/2/2016)</ref> | ||
== Nerve Supply == | == Nerve Supply == | ||
Suprascapular Nerve (C5 & C6)<ref name=" | Suprascapular Nerve (C5 & C6)<ref name="p3">AnatomyExpert. 3D Infraspinatus- infraspinatus. Available from: http://www.anatomyexpert.com/app/structure/5510/554/ (last accessed on 29/2/2016)</ref> | ||
== Blood Supply == | == Blood Supply == | ||
Suprascapular and circumflex scapular arteries.<ref name=" | Suprascapular and circumflex scapular arteries.<ref name="p3" /> | ||
== Action == | == Action == | ||
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It assists in producing shoulder extension. | It assists in producing shoulder extension. | ||
With the arm fixed, it abducts the inferior angle of the scapula. <ref name=" | With the arm fixed, it abducts the inferior angle of the scapula. <ref name="p2" /> | ||
== Function == | == Function == | ||
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It provides the primary muscle force for external rotation of the shoulder. | 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.<ref name=" | Along with the rest of the Rotator Cuff muscles it provides stability to the shoulder complex.<ref name="p3" /> | ||
== Resources == | == Resources == | ||
Revision as of 12:44, 6 June 2017
Original Editor - Wendy Walker
Lead Editors - Kate Sampson, Kim Jackson, Wendy Walker, Lilian Ashraf, 127.0.0.1, Oyemi Sillo, WikiSysop, Aya Alhindi, 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]
Recent Related Research (from Pubmed)[edit | edit source]
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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)
- ↑ KenHub. Infraspinatus Muscle - Attachments &amp; Action/Function. Available from: https://www.youtube.com/watch?v=rdwyUrDQoUg (last accessed 29/2/2016)
