What are some Deltoid muscle actions?

Actions of the Deltoid Muscle

* Shoulder flexion, when the arm is brought forward from the side of the body.

* Shoulder abduction, when the arm is raised out to the side of the body.

* Shoulder extension, when the arm is brought back from the front or the side of the body.

* Shoulder internal rotation, when the arm is turned inward so that the palm is facing the body.

* Shoulder external rotation, when the arm is turned outward so that the palm is facing away from the body.

Deltoid Muscle Attachments

The deltoid muscle originates on the lateral (side) aspect of the clavicle (collarbone), the acromion process of the scapula (shoulder blade), and the spine of the scapula. It inserts onto the deltoid tuberosity of the humerus (upper arm bone).

Deltoid Muscle Innervation

The deltoid muscle is innervated by the axillary nerve, which arises from the brachial plexus.

Deltoid Muscle Blood Supply

The deltoid muscle is supplied by the axillary artery, which is a branch of the subclavian artery.

Deltoid Muscle Strengthening Exercises

There are several exercises that can be done to strengthen the deltoid muscle. These include:

* Shoulder press: This exercise can be done with a barbell, dumbbells, or a machine.

* Front raise: This exercise can be done with dumbbells or a machine.

* Lateral raise: This exercise can be done with dumbbells or a machine.

* Reverse fly: This exercise can be done with dumbbells or a machine.

Deltoid Muscle Injuries

The deltoid muscle can be injured in a number of ways, including:

* Muscle strains: These occur when the muscle is stretched or torn.

* Shoulder dislocations: These occur when the shoulder joint is forced out of its socket.

* Shoulder impingement: This occurs when the tendons of the rotator cuff muscles become trapped between the humerus and the acromion process of the scapula.

Deltoid Muscle Rehabilitation

The rehabilitation for deltoid muscle injuries depends on the severity of the injury. Treatment may include rest, ice, compression, and elevation (RICE), as well as physical therapy.