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The serratus anterior muscle, also known as the boxer's muscle, is a fan-shaped muscle that originates at the first 8-9 ribs and inserts onto the medial border of the scapula (shoulder blade). It is responsible for protraction and upward rotation of the scapula, keeping the shoulder blade close to the thoracic wall and allowing for forward elevation of the arm. This muscle is essential for shoulder girdle performance and health, and when weak, can lead to scapular winging or poor scapular control. Training the serratus anterior can improve shoulder stability, reduce the risk of injury, and enhance overall shoulder health. To effectively train this muscle, exercises such as scapular push-ups, regular push-ups, push-up plus, and dumbbell rotational punches can be performed. These exercises involve shoulder blade movements, which activate the serratus anterior and improve its strength and control.
| Characteristics | Values |
|---|---|
| Location | The serratus anterior muscle is located below the armpits. |
| Appearance | The muscle has a serrated appearance and resembles a set of fingers squeezing the upper torso. |
| Function | The muscle is responsible for protraction and upward rotation of the scapula, allowing for forward elevation of the arm and pulling the scapula forward around the rib cage. It also helps stabilize the scapula and optimize shoulder movement. |
| Exercises | Scapular push-ups, scapular pull-ups, punches, overhead pressing movements, ab rollout, pullover, and dumbbell rotational punch. |
| Benefits | Training the serratus anterior can improve shoulder health, reduce the risk of injury, and improve posture. It can also contribute to a well-defined physique. |
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What You'll Learn
The serratus anterior muscle's role in shoulder health
The serratus anterior muscle is a fan-shaped muscle that originates from the first to eighth or ninth rib and attaches to the medial border of the scapula (shoulder blade). It is an important muscle for shoulder health and performance, but it is often overlooked by people experiencing shoulder pain and even by exercise trainers.
The serratus anterior has three components: superior, middle, and inferior. The superior component originates from the first and second ribs and inserts into the superior medial angle of the scapula, acting as an anchor that allows the scapula to rotate when the arm is lifted overhead. The middle component stems from the third to fifth ribs and inserts on the vertebral border of the scapula, serving to protract the scapula. The inferior component creates upward rotation, which is necessary for achieving a full range of motion in the shoulder joint. This upward rotation allows the arm to be lifted above shoulder height.
The serratus anterior contributes to shoulder health by providing support for the shoulder blades to stay in a neutral position with the arms by the side. It also helps bring the arms overhead. When the serratus anterior is weak, it can increase the rounding of the shoulders, and the shoulder blades may sit further away from the spine. This can put more strain on the shoulder joint and the AC joint, where the collarbone and shoulder blade connect, leading to issues such as shoulder impingement and rotator cuff tears.
A weak or inactive serratus anterior can lead to scapular dysfunction, causing the scapula to exhibit winging or tilting, which alters the mechanics of shoulder movement and places excessive stress on surrounding structures. This can contribute to shoulder pain, impingement, and reduced shoulder performance. Therefore, it is important to include exercises that target the serratus anterior to maintain shoulder health and prevent injuries.
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Exercises to train the serratus anterior
The serratus anterior is a fan-shaped muscle that originates at the first eight or nine ribs and inserts onto the medial border of the scapula (shoulder blade). It is an important muscle for shoulder girdle performance and health, helping to stabilize the shoulder muscles and assisting with overhead movements.
There are three parts to the serratus anterior: the superior, middle, and inferior. The superior portion serves as an anchor that allows the scapula to rotate when the arm is lifted overhead, while the middle component protracts the scapula. The inferior component is the most powerful and prominent part, creating upward rotation.
- Scapular push-ups: These strengthen the serratus anterior and can also improve core strength and posture. They can be done as part of a warm-up if you find bodybuilding exercises challenging.
- Regular push-ups: Bodyweight push-ups train various muscle groups in the upper body, including the serratus anterior.
- Push-up plus: This is another great exercise to train the serratus anterior, and you can dictate how much load to place on your shoulders.
- Wall slide: This exercise is designed to target the serratus anterior by maximizing scapular upward rotation, not elevation.
- Dumbbell rotational punch: This exercise can help train the serratus anterior, which is needed for a variety of arm movements.
- Lie down with a weight in one hand: Lie down on a bed with your back flat and hold a weight in one hand. Lift your arm above your face and punch straight up in the air.
For best results, try different exercises to see what works for you and do them consistently over a period of time.
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The serratus anterior's role in posture
The serratus anterior, also known as the "Big Swing Muscle" or the "Boxer's Muscle", is a fan-shaped muscle that plays a crucial role in maintaining a strong and balanced posture. It originates at the far inside border of the shoulder blade, travelling between the shoulder blade and the thorax, and attaches to the first eight or nine ribs.
The serratus anterior is responsible for protraction and upward rotation of the scapula, keeping the shoulder blade close to the thoracic wall. This muscle helps to anchor and stabilise the shoulder blade, allowing for fluid and efficient movement of the shoulders. When the serratus anterior functions properly, it facilitates a smooth and pain-free range of motion in everyday activities and athletic movements. It also plays a role in scapular upward rotation and disassociating scapular movement from the rib cage, which improves core control and posture.
A well-functioning and strong serratus anterior can help to alleviate neck and shoulder pain, reduce forward head posture, and prevent "scapular winging", where the shoulder blade abnormally moves away from the thorax during arm movements. This muscle also improves core function through its connections with the external obliques, enhancing hip function and reducing back pain.
To strengthen the serratus anterior, exercises such as scapular push-ups, regular push-ups, push-up plus, bear crawl, and dumbbell rotational punch can be performed. These exercises can help improve posture and prevent injuries by ensuring the serratus anterior functions efficiently.
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The serratus anterior's impact on a person's physique
The serratus anterior, also known as the "boxer's muscle" or the "big swing muscle", is a fan-shaped muscle that originates at the first eight or nine ribs and inserts onto the medial border of the scapula (shoulder blade). It is responsible for protraction and upward rotation of the scapula, keeping the shoulder blade close to the thoracic wall and allowing for overhead lifting. This muscle is essential for shoulder health and stability, preventing "scapular winging" where the shoulder blade abnormally moves away from the thorax during arm movements.
The serratus anterior has three components: superior, middle, and inferior. The superior portion, originating from the first and second ribs, serves as an anchor that allows the scapula to rotate when the arm is lifted overhead. The middle component stems from the third to fifth ribs and serves to protract the scapula. The inferior part, originating from the fourth to eighth or ninth rib, is the most prominent and powerful, creating upward rotation.
The serratus anterior is important for posture and avoiding neck pain. When functioning properly, it allows for fluid and efficient movement of the shoulders, reducing the impact on the neck. A weak serratus anterior can lead to shoulder impingement and even rotator cuff tears as the body will compensate with trick movements to lift the arm, often by shrugging the shoulders.
Training the serratus anterior can give a person a more defined look below the armpits and improve their overall physique. Exercises that target this muscle include scapular push-ups, regular push-ups, push-up plus, bear crawl, and dumbbell rotational punch.
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The serratus posterior muscle
The serratus muscle group consists of two muscles: the serratus anterior and the serratus posterior. This article will focus on the serratus posterior muscle.
The serratus posterior is an intermediate layer of back muscles, consisting of the serratus posterior superior and serratus posterior inferior. These muscles are located in the upper and lower back, extending obliquely from the vertebral column to the rib cage. The serratus posterior superior originates from the C7-T3 vertebrae spinous process and nuchal ligament, inserting at the upper border of the 2nd-5th ribs. The serratus posterior inferior originates from the T11-L2 vertebrae spinous process, inserting at the lower border of the 9th-12th ribs.
The main function of the serratus posterior muscles is to facilitate respiration. The serratus posterior superior elevates the ribs, supporting inspiration, while the serratus posterior inferior depresses the ribs during expiration. These muscles may also contribute to myofascial pain syndrome, particularly when improper posture or muscle use is involved, such as holding a phone between the ear and shoulder. This can lead to scapulocostal syndrome, causing pain and paresthesia along the medial border of the scapula, radiating to the neck, chest, and upper extremities.
To expose the serratus posterior superior muscle for self-massage, manoeuvre the shoulder blade by crossing your arm to the opposite side and using the other hand to hold a massage ball or trigger fairy. Place it beside your shoulder blade at the level of the spine of the scapula, then move your arm to the other side to expose the muscle. Once a trigger point is found, apply slow, precise movements or circular movements with the massage tool.
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Frequently asked questions
The serratus anterior muscle, also known as the "Big Swing Muscle" or the Boxer's Muscle, is a muscle that helps optimise the movement of our shoulders. It is a broad, flattened muscle that runs from the lateral surface of the ribs, passes posteriorly around the thoracic wall, and inserts on the costal surface of the medial border of the scapula.
The serratus anterior muscle is essential for good shoulder mobility and helps to stabilise the shoulder muscles. It also assists with overhead movements such as the overhead press and dumbbell bench press. Training this muscle can help reduce the risk of injury, especially in the shoulders.
Some exercises that can help train the serratus anterior muscle include scapular push-ups, regular push-ups, push-up plus, bear hug, unilateral banded chest press, wall slide, dumbbell pullover, ab roller workouts, bear crawl, and dumbbell rotational punch.
