Longissimus Capitis Muscle
Deltoid Muscle – Anterior and Middle Heads
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The deltoid muscle (derived its name from the Greek letter delta) is a large, triangular shoulder muscle occupying the upper arm and the shoulder giving it this rounded shape. The deltoid consists of three sets of fibers: anterior, middle, and posterior.
Deltoid Muscle - Anterior and Middle Heads
Attachments of Deltoid Muscle: Origin & Insertion
Origin: (proximal attachments)
a. Anterior (clavicular) head: anterior surface of the lateral clavicle.
b. Middle (acromial) head: acromion process and spine of the scapula.
Insertion: (distal attachments)
a. Deltoid tuberosity of the humerus.
Learn the muscles of the shoulder even faster with these handy muscle anatomy reference charts!
Actions of Deltoid Muscle:
Anterior Head:
a. at the (glenohumeral) shoulder joint.
b. Medially rotates the arm at the glenohumeral shoulder joint.
Middle Head:
a. Abducts the arm at the glenohumeral shoulder joint.
Innervation of Deltoid Muscle:
Nerves to the muscle:
Axillary nerve
Nerve roots:
C5 and C6
Interactive quiz with muscles that act on the arm
Muscles That Act On The Anterior Arm
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