The Deltoid Muscle
muscle that forms the rounded contour of the shoulder.
Delta = triangle.
Frequent site for intra-muscular injections.
It arises in three sets of fibers:
Anterior fibres: from the lateral third of the
Middle fibres: from
Posterior fibres: from posterior spine of the
fibers converge toward their insertion into V-shaped deltoid tuberosity on the middle of the lateral aspect of the shaft of the humerus.
Axillary nerve (C5,C6).
Lateral supraclavicular nerve to some extent
Anterior fibres - flexion of shoulder
Lateral fibres - abduction of shoulder
Posterior fibres - extension of shoulder
Since the muscle derives its nerve from C5, C6 roots, in cervical myelopathy and brachial plexus injury the muscle gets wasted.
In cervical spondylosis pain felt in this muscle
One of the common sites for intramuscular injections
Deltoid Anterior View
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