Longissimus Capitis Muscle
Deltoid Muscle – Anterior and Middle Heads
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.
Attachments of Deltoid Muscle: Origin & Insertion
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:
b. Medially rotates the arm at the glenohumeral shoulder joint.
a. Abducts the arm at the glenohumeral shoulder joint.
Innervation of Deltoid Muscle:
Nerves to the muscle:
C5 and C6
Interactive quiz with muscles that act on the arm
Muscles That Act On The Anterior Arm