deltoid
triangular shoulder muscle that abducts the arm and is used as an injection site
The deltoid muscle is a three-headed muscle located on the shoulder. It is one of the major muscles involved in the movement of the upper arm and shoulder joint.
The three heads of the deltoid muscle are the anterior head, the middle head, and the posterior head. The anterior head is responsible for flexion and medial rotation of the arm, while the middle head is responsible for abduction of the arm. The posterior head is responsible for extension and lateral rotation of the arm.
The deltoid muscle is important for many daily activities, such as lifting and carrying objects, throwing a ball, and reaching overhead. It is also commonly used in weightlifting and bodybuilding exercises to develop and strengthen the shoulder muscles.
To strengthen the deltoid muscle, exercises such as shoulder presses, lateral raises, bent-over lateral raises, and front raises can be performed. However, it is important to use proper form and avoid overexertion to prevent injuries to the shoulder joint and surrounding muscles.
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