
The deltoid muscle is a large, triangular-shaped muscle that forms the rounded contour of the human shoulder. It is also known as the 'common shoulder muscle' and is one of the six intrinsic muscles of the shoulder. The deltoid is a very powerful muscle that is used in many everyday actions, such as lifting, pushing, pulling, and brushing the hair.
| Characteristics | Values |
|---|---|
| Shape | Triangular |
| Location | Over the glenohumeral joint |
| Function | Forms the rounded contour of the shoulder |
| Other names | Common shoulder muscle, deltoideus |
| Number of distinct sets of muscle fibres | Three |
| Number of groups that can be independently coordinated by the nervous system | At least seven |
What You'll Learn
- The deltoid muscle is a large, triangular-shaped muscle that lies superficially to other muscles of the shoulder
- The deltoid is one of the main abductors of the shoulder, helping lift the arm when reaching for objects
- The deltoid is one of six intrinsic muscles of the shoulder
- The deltoid is made up of three distinct sets of muscle fibres
- The deltoid is one of the most complex muscle groups in the body

The deltoid muscle is a large, triangular-shaped muscle that lies superficially to other muscles of the shoulder
The deltoid is one of the six intrinsic muscles of the shoulder. It is also known as the 'common shoulder muscle', particularly in other animals such as the domestic cat. The deltoid muscle is made up of three distinct sets of muscle fibres, which are pennate muscle fibres. However, electromyography suggests that it consists of at least seven groups that can be independently coordinated by the nervous system.
The deltoid muscle is connected with many other muscles and bones in the upper back, neck, and shoulder region. It is extremely mobile and helps to keep the upper body balanced. Its minimal attachments to the bone allow it to move in almost any direction without restrictions.
The deltoid muscle is responsible for forming the shoulder's rounded contour. It is a very powerful muscle and is used in many everyday activities, such as putting on clothes, carrying shopping bags, and washing hair. It is also used in athletic activities.
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The deltoid is one of the main abductors of the shoulder, helping lift the arm when reaching for objects
The deltoid is a large, triangular-shaped muscle that lies superficially to other muscles of the shoulder. It is one of the six intrinsic muscles of the shoulder, and is also known as the 'common shoulder muscle'. The deltoid is one of the main abductors of the shoulder, helping lift the arm when reaching for objects. It is also active when carrying heavy weights, like a suitcase or grocery bags, in order to prevent dislocation of the glenohumeral joint.
The deltoid is a very powerful muscle and is used in many everyday actions such as putting clothes on a line, carrying shopping bags, and washing hair. It is also used in athletic activities. The deltoid is extremely mobile, keeping the upper body balanced and helping with actions like pushing and pulling. It is connected with many other muscles and bones in the upper back, neck, and shoulder region.
The deltoid is made up of three distinct sets of muscle fibres, which are pennate muscle. Electromyography suggests that it consists of at least seven groups that can be independently coordinated by the nervous system. The deltoid is also one of the most complex muscle groups in the body, with minimal attachments to the bone, allowing it to move in almost any direction without restrictions.
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The deltoid is one of six intrinsic muscles of the shoulder
The deltoid is a large, triangular-shaped muscle that forms the rounded contour of the shoulder. It is one of the six intrinsic muscles of the shoulder, alongside the teres major and the four rotator cuff muscles. The deltoid is a superficial muscle, located overlying the glenohumeral joint, where the upper arm meets the torso. It is connected to many other muscles and bones in the upper back, neck and shoulder region. The deltoid is a very powerful and complex muscle group, with minimal attachments to the bone, allowing it to move in almost any direction without restrictions. It is one of the main abductors of the shoulder, responsible for lifting the arm when reaching for objects or brushing the hair. The deltoid is also active when carrying heavy weights, such as a suitcase or grocery bags, helping to prevent dislocation of the glenohumeral joint. Anatomically, the deltoid muscle is made up of three distinct sets of muscle fibres: the anterior or clavicular, middle or acromial, and posterior or spinal. These fibres are pennate muscle, and electromyography suggests that the deltoid consists of at least seven groups that can be independently coordinated by the nervous system.
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The deltoid is made up of three distinct sets of muscle fibres
The deltoid muscle is a large, triangular-shaped muscle that lies superficially to other muscles of the shoulder. It is responsible for forming the shoulder's rounded contour. The deltoid is made up of three distinct sets of muscle fibres: the anterior or clavicular, the middle or acromial, and the posterior or spinal. These fibres are pennate muscle, and they allow the deltoid to be one of the most mobile muscle groups in the body. The deltoid has minimal attachments to the bone, which means it can move in almost any direction without restrictions. This mobility enables the deltoid to perform a variety of functions, including lifting, pushing, and pulling. The deltoid is also one of the main abductors of the shoulder, helping to lift the arm when reaching for objects or brushing hair. It is active in carrying heavy weights to prevent dislocation of the glenohumeral joint.
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The deltoid is one of the most complex muscle groups in the body
The deltoid muscle is made up of three distinct sets of muscle fibres. These are the anterior or clavicular, middle or acromial, and posterior or spinal. Electromyography suggests that it consists of at least seven groups that can be independently coordinated by the nervous system. The deltoid is a very powerful muscle and is used in many everyday activities, such as putting clothes on a line, carrying shopping bags, or washing hair. It is also used in athletic activities.
The deltoid is a superficial muscle located overlying the glenohumeral joint and is one of the six intrinsic muscles of the shoulder. It is connected with many other muscles and bones in the upper back, neck, and shoulder region and is extremely mobile. The deltoid keeps the upper body balanced and helps perform everyday actions like lifting, pushing, and pulling.
The deltoid muscle is also known as the 'common shoulder muscle', particularly in other animals such as the domestic cat. It was previously called the deltoideus (plural deltoidei) and the name is still used by some anatomists. It is called so because it is in the shape of the Greek capital letter delta (Δ).
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Frequently asked questions
The deltoid muscle is a large, triangular-shaped muscle that forms the rounded contour of the shoulder. It is also known as the 'common shoulder muscle'.
The deltoid is a superficial muscle located overlying the glenohumeral joint, where the upper arm meets the torso.
The deltoid is one of the main abductors of the shoulder, meaning it helps lift the arm when reaching for objects. It is also active when carrying heavy weights, like a suitcase or grocery bags, in order to prevent dislocation of the glenohumeral joint.

