Rear Delt Anatomy
The rear delt is different though. Deltoid anatomy your rear delts are referred to physiologically as the posterior head of the deltoid joining the anterior and lateral heads to form the full deltoid muscle.
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The posterior deltoid is located on the back of your shoulder.
Rear delt anatomy. All three deltoid heads attach to the humerus. The three heads originate along the scapula shoulder blade and collarbone and connect midway down your humerus upper arm. Its main function is shoulder extension which is characterized by pulling your upper arms backward and bringing your shoulder blades together.
Anatomy of the shoulder muscles. When you lift your arms straight out to your sides the middle lateral and rear deltoids work hard along with the supraspinatus one of the four rotator cuff muscles which lies beneath the deltoid. In other words it arises from the lateral aspect of the spine of the scapula and inserts into the deltoid tubercle of the humerus.
The deltoid is a three headed muscle that caps the shoulder. Anatomy similar to the triceps there are 3 heads to the deltoids. The rear deltoid starts on the shoulder blade or rather on a diagonal spine that protrudes from the cuts across the top third of the scapula.
The rear delt attaches to the deltoid tuberosity on the upper arm bone humerus and has its opposite attachment to the spine of the scapula. The three heads of the deltoid are the anterior lateral and posterior. The posterior deltoid l.
It acts on the shoulder joint and is the prime mover in shoulder horizontal abduction. The anterior the middle and the posterior. In addition to this it also causes other bigger muscles to come into play such as the upper traps.
The anterior deltoid starts originates on the anterior surface of the clavicle collarbone the middle or lateral deltoid starts on the acromion and spine of the scapulashoulder blade. The anterior and lateral heads originate on the collar bone while the posterior head originates on the scapula. Rear delts can typically be isolated with machines cables and dumbbells.
This muscle is targeted in movements like the dumbbell rear deltoid raise face pull and bent over row. Unilateral one arm versions allow greater range of motion and intensity. Deltoides triangular refers to the rear head of the three headed deltoid muscle.
Going too heavy with rear delt exercises often leads to a lack of optimal muscle contraction of the posterior deltoid especially if you have never felt your rear delts work in the first place.
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