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The deltoid muscle, often shortened to delt, is a large, rounded, triangular muscle that forms the contour of the human shoulder. It is a powerful muscle that helps move the arm in different directions and is used in many everyday activities, such as putting on clothes or carrying shopping bags, as well as athletic activities like swimming and tennis. The deltoid is a skeletal muscle, meaning it is a voluntary muscle that can be moved by choice. It is also an abductor of the shoulder, assisting in forward elevation.
| Characteristics | Values |
|---|---|
| Name | Deltoid Muscle |
| Alternative Names | Delt, Common Shoulder Muscle, Deltoideus |
| Shape | Triangular |
| Muscle Parts | Anterior or Clavicular, Middle or Acromial, Posterior or Spinal |
| Muscle Fibers | Pennate |
| Neuromuscular Segments | 7 |
| Function | Shoulder Stabilizer, Shoulder Abduction, Shoulder Flexion, Shoulder Extension, Shoulder Rotation |
| Blood Supply | Thoracoacromial Branch of the Axillary Artery |
| Innervation | Axillary Nerve |
| Average Mass | 192 grams |
| Range of Mass | 84 grams to 366 grams |
| Injury Treatment | Rest, Ice, Medication |
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What You'll Learn
Delt muscles are made up of three distinct parts
The deltoid muscle, often shortened to "delt" in slang, is a thick, triangular shoulder muscle that forms the rounded contour of the human shoulder. It is a key shoulder stabilizer and is used in many everyday activities and athletic movements.
The delt muscles are made up of three distinct parts: the anterior or clavicular part (also known as the front delt), the posterior or scapular part (also known as the rear delt), and the intermediate or acromial part (also known as the side delt). These three parts correspond to two or three discernible areas of insertion and three areas of origin. The anterior and posterior portions are unipennate, while the lateral region is multipennate. The acromial part is the largest and strongest of the three sections.
Each of these parts has a different function and attaches to a different region of the shoulder. The anterior deltoids are used when moving the arm forward in front of the body, such as when walking or running. They are also activated when moving the thumb inward toward the body. The posterior deltoids are used when reaching backward or rotating the shoulder and can assist in external rotation of the humerus. The lateral or intermediate deltoids are the largest of the three and are used when moving the arms out to the side. When the three parts of the deltoid contract simultaneously, it results in the abduction of the shoulder when the arm is already held at 15 degrees of abduction.
The deltoid muscle is one of the most complex and mobile muscle groups in the body. It has minimal attachments to the bone, allowing it to move in almost any direction without restrictions. This mobility also makes it prone to injury. The deltoid muscle can be injured by repeated overhead activities, sports injuries, and vehicle crashes, often in conjunction with rotator cuff tears or traumatic shoulder dislocations.
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They are a key shoulder stabiliser
The deltoid muscle, often shortened to "delt" in slang, is a key shoulder stabiliser. It is a large, triangular-shaped muscle that forms the rounded contour of the human shoulder. It gets its name from its shape, which resembles the inverted Greek letter delta. The deltoid muscle is made up of three distinct sets of muscle fibres: the anterior or clavicular part (commonly known as the front delt), the posterior or scapular part (commonly known as the rear delt), and the intermediate or acromial part (commonly known as the side delt).
The deltoid muscle is a powerful muscle that plays a crucial role in shoulder abduction and stabilisation. It is responsible for elevating the arm in the scapular plane, and its contraction elevates the humeral head. The deltoid muscle is also involved in forward elevation and assists in arm flexion and internal rotation during walking or running motions. The anterior and posterior parts of the deltoid work together to stabilise the arm, while the lateral segment assists in raising the arm from 15° to 100° degrees.
The deltoid muscle has a very broad origin and a narrow base, creating its triangular shape. It originates from the scapular spine, superior acromial surface, and lateral third of the clavicle. The muscle then attaches distally to the deltoid tuberosity of the humerus. This U-shaped attachment mirrors the trapezius muscle's distal insertion. The deltoid muscle receives its blood supply from various branches of the axillary artery and is innervated by the axillary nerve.
The deltoid muscle is susceptible to injuries, especially during overhead activities, sports, and motor vehicle crashes. These activities can lead to tears or strains. Additionally, repeated intramuscular injections can also cause injury to the deltoid muscle. It is important to perform specific exercises and routines to maintain strong and flexible deltoid muscles and prevent injuries. Some examples of deltoid-strengthening exercises include wall push exercises, dumbbell weight exercises, and resistance band exercises.
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They are one of the most complex muscle groups in the body
The deltoid muscle, often shortened to "delt" in slang, is a large, triangular-shaped shoulder muscle that forms the rounded contour of the human shoulder. It is comprised of three distinct portions: the anterior or clavicular, middle or acromial, and posterior or spinal. The deltoid is a very powerful muscle and is used in many everyday activities and athletic movements.
The deltoid is one of the most complex muscle groups in the body. It has minimal attachments to the bone, which means it can move in almost any direction without restrictions. This mobility also makes it one of the areas most prone to injury. Shoulder injuries are one of the most common reasons for a visit to the doctor, with nearly eight million people seeking medical attention for shoulder pain annually.
The deltoid muscle has a very broad origin and a narrow base, creating its triangular shape. It passes inferiorly, surrounding the glenohumeral joint on all sides, and inserts onto the humerus. The deltoid is formed of acromial, clavicular, and scapular spinal parts. The acromial part, or the middle fibres, is the largest and strongest of the three parts. It abducts the arm, while the clavicular and scapular spinal parts play a significant role in stabilization, ensuring a steady plane of abduction.
The deltoid muscle has a broad origin, spanning the clavicle, acromion, and spine of the scapula. The anterior or clavicular fibres arise from the anterior border and upper surface of the lateral third of the clavicle. The intermediate or acromial fibres arise from the superior surface of the acromion process of the scapula. The posterior or spinal fibres arise from the lower lip of the posterior border of the spine of the scapula. These fibres then converge towards their insertion on the deltoid tuberosity of the humerus.
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They are susceptible to injury
The deltoid muscle is a large, triangular-shaped shoulder muscle. It is responsible for lifting the arm and giving the shoulder its range of motion. It is a common site for intramuscular injections, including vaccinations.
Deltoid muscles are susceptible to injury. They are used in many everyday activities and athletic activities such as putting on clothes, carrying shopping bags, swimming, and playing netball. People who use their shoulders and deltoid muscles repetitively, especially athletes, have an increased risk of deltoid injury. The most common causes of deltoid pain are overuse injuries and strains. Strains can happen suddenly or develop slowly over time due to repetitive overhead arm movements. Shoulder tendonitis is another common injury, caused by inflamed tendons in the shoulder, which can make it difficult to use shoulder muscles or move the joint.
Deltoid muscle injuries can be caused by accidents, such as a trip or fall, or by sports or occupational trauma. They can also be caused by axillary nerve injury, rupture of the deltoid, or iatrogenic damage to the muscle. The axillary nerve supplies sensation to the deltoid muscle, and it can be damaged during surgery or by a traumatic injury or overuse of a crutch. This can lead to shoulder weakness or numbness, especially around the deltoid muscle.
To prevent deltoid injuries, it is important to warm up sufficiently before beginning a workout and to take rest days to allow the muscle to recover. It is also important to use the proper safety equipment and follow best practices if the activity is work-related. Sports massages can also help to relieve tension in the muscles.
If a deltoid injury occurs, most conditions can be healed with nonsurgical treatments. These include ice or cold compresses to reduce inflammation, pain relievers or muscle relaxants, physical therapy, and steroid injections to relieve pain and swelling. For more serious injuries, a doctor may recommend additional treatments such as compression wraps and rest.
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They are involved in flexion, internal rotation and horizontal adduction
The deltoid muscle, often shortened to "delt", is a large triangular-shaped muscle that forms the rounded contour of the human shoulder. It is comprised of three distinct portions: the anterior or clavicular, middle or acromial, and posterior or spinal. 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, as well as athletic activities like netball, swimming, and water polo.
The deltoid is a key shoulder stabilizer. It prevents inferior glenohumeral joint displacement while bearing a heavy load, as in deadlift exercises. It is also the prime mover of arm abduction along the frontal plane. The arm must be medially rotated for the deltoid to have maximum effect. This makes the deltoid an antagonist muscle of the pectoralis major and latissimus dorsi during arm adduction.
The deltoid's primary function is flexion, internal rotation, and horizontal adduction. Flexion refers to a movement that decreases the angle between two body parts. For example, flexion at the elbow decreases the angle between the ulna and the humerus. Internal rotation is a rotational movement towards the midline of the body. To understand this, imagine rotating your leg to point your toes inward. Horizontal adduction refers to a movement towards the midline of the body.
To strengthen the deltoid muscle, exercises such as standing next to a wall with your back and elbow straight and gently pushing your arm against the wall as hard as possible without pain can be performed. This exercise should be repeated 10 times on each side, provided it is pain-free. Other exercises include suitable dumbbell weight, arm raises, and resistance band forward raises, lateral raises, and pullbacks.
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Frequently asked questions
The deltoid muscle, also known as the delt, is a large triangular-shaped shoulder muscle. It is comprised of three distinct portions: the anterior or clavicular, middle or acromial, and posterior or spinal.
The deltoid muscle is a key shoulder stabilizer. It assists in abduction of the arm, flexion, and extension movements. It also helps with everyday actions like lifting, pushing, and pulling.
Some exercises to strengthen the deltoid muscle include:
- Standing next to a wall with a straight back and elbow, and gently pushing the arm against the wall.
- Resistance band forward raises, lateral raises, and pullbacks.
- Dumbbell weight, arm raises anterior, lateral, and posterior.
The deltoid muscle is one of the areas most prone to injury due to its high mobility. Common injuries include tears, strains, tendonitis, and bursitis. It can also be injured by repeated overhead activities, sports injuries, and motor vehicle crashes.
The deltoid muscle covers the very top of your arm and is easy to find. To locate it, touch the side of your neck and follow your shoulder line outward to where your arm slants downward.
