The deltoid muscles are thick triangular muscles that
cover the shoulder joints. Each deltoid muscle comprises of three parts:
the anterior part, the lateral part, and the posterior part.
For a detailed illustration of their location see the pages about Anterior
Muscles and/or Posterior
Muscles in the Revision for Therapists Section of the IvyRose website.
Further information about the deltoid muscles is summarised
below:
Point(s) of Origin:
|
Anterior Part: Lateral clavicle.
Lateral Part: Acromium process (on the scapula bone).
Posterior Part: Spine of scapula.
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Point(s) of Insertion:
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Deltoid tuberosity of humerus
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Action(s):
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Anterior Part: Draws arm forward, inwardly rotates and aducts
the arm.
Lateral Part: Abducts the arm.
Posterior Part: Draws the arm back and abducts the arm.
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