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The Deltoid Muscle
Introduction
muscle that forms the rounded contour of the shoulder.
Delta = triangle.
Frequent site for intra-muscular injections.
Origin
It arises in three sets of fibers:
" Anterior fibres: from the lateral third of the clavicle
" Middle fibres: from acromion
" Posterior fibres: from posterior spine of the scapula,
"
Insertion
fibers converge toward their insertion into V-shaped deltoid tuberosity on the middle of the lateral aspect of the shaft of the humerus.
Nerve supply
Axillary nerve (C5,C6).
Lateral supraclavicular nerve to some extent
Action
Anterior fibres - flexion of shoulder
Lateral fibres - abduction of shoulder
Posterior fibres - extension of shoulder
Structure
Multipennate muscle
Applied anatomy
Since the muscle derives its nerve from C5, C6 roots, in cervical myelopathy and brachial plexus injury the muscle gets wasted.
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Copyright © 2008 by Velsundar.K. All rights reserved.
learnvell™ is a trademark of Velsundar.K.
Please use the above e-mail address kasiviswanathanvatyahoodotcom for any suggestions for improvements. Please feel free to communicate any of your requirements.
