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The latissimus dorsi muscle, commonly known as the 'lats' muscle, is the widest muscle in the human body. It is a large, flat muscle that covers the back and stretches to the sides, behind the arms. The lats muscle is an important muscle for several activities, including rowing, swimming, and chopping. It is also one of the main stabilizers of the spine and assists in breathing by enhancing the movement of the trunk during inhalation and exhalation. The lats muscle can be injured due to overuse, poor posture, or improper form during sports and exercises such as weightlifting, pull-ups, and bench presses. So, is there muscle under the lats?
| Characteristics | Values |
|---|---|
| Common Names | Latissimus Dorsi, Lats Muscle, Lats |
| Location | Lower Posterior Thorax, Back |
| Function | Upper Extremity Movement, Accessory Respiratory Muscle |
| Innervation | Thoracodorsal Nerve (C6-C8), Sixth to Eighth Cervical Nerves |
| Blood Supply | Thoracodorsal Artery, Subscapular Artery |
| Attachments | Vertebral Processes (T7-L5), Thoracolumbar Fascia, Scapula, Humerus |
| Fibres | Horizontal (Upper), Vertical (Lower) |
| Related Muscles | Teres Major, Pectoralis Major, Levator Scapulae, Rhomboid |
| Exercises | Chin-ups, Chair-assisted Chin-ups, Swimming, Rock Climbing |
| Injuries | Strains, Tears, Pulls, Sports Injuries (Golf, Baseball, Swimming) |
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What You'll Learn
- The latissimus dorsi muscle is the widest muscle in the human body
- It assists in deep inspiration and expiration
- It is one of the main stabilisers of the spine
- It is a potential source of muscle for breast reconstruction surgery
- It can be injured due to overuse, poor posture, or poor form in sports and exercise
The latissimus dorsi muscle is the widest muscle in the human body
The latissimus dorsi muscle, commonly known as 'the lats muscle' or simply 'the lats', is the widest muscle in the human body. It is a large, flat muscle that covers almost all back muscles at the
Functionally, the latissimus dorsi muscle is involved in the muscles of the scapular motion. It can pull the inferior angle of the scapula in various directions, resulting in movements of the shoulder joint, including internal rotation, adduction, and extension of the arm. The muscle also plays a role in the extension and lateral flexion of the lumbar spine. The latissimus dorsi is an accessory respiratory muscle, assisting with deep inspiration and expiration by elevating or depressing the ribs, respectively. These actions are achieved depending on which of the muscle's fibres are activated. The muscle assists in violent expiration, as it attaches to the ribs. During a cough or sneeze, the muscle can be felt pressing forcibly inward, as it acts to compress the thorax and abdomen.
The latissimus dorsi works collaboratively with the teres major and pectoralis major muscles to perform actions of the upper extremity. Together, these muscles adduct, medially rotate, and extend the arm at the glenohumeral joint. The latissimus dorsi is also active in moving the trunk forward and upward when the upper extremities are fixed overhead, as in climbing or performing an activity such as a chin-up. It is one of the main stabilisers of the spine during its various movements.
Injury to the latissimus dorsi muscle can occur due to overuse, poor posture, or poor form during sports and exercise. Common exercises that engage the muscle include weightlifting, pull-ups, and bench presses. Specific sports that can increase the risk of injury include golf, baseball, skiing, rowing, tennis, and swimming. Treatment for an injured latissimus dorsi muscle typically includes rest, ice, compression, and elevation, along with non-steroidal anti-inflammatory medication if the pain or swelling is severe.
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It assists in deep inspiration and expiration
The latissimus dorsi muscles, commonly known as "lats", are triangular back muscles located below the shoulder blade and to the left and right of the spine. They are the widest muscles in the human body. The lats help stabilise your back while extending your shoulders, allowing you to do things like pull-ups, vertical climbing and swimming.
The lats also assist with the breathing process. They are accessory breathing muscles, which means they enhance the movements of the trunk during inhalation and exhalation. During inhalation, the lats lift and expand the circumference of the rib cage, which may increase the volume of air that enters your lungs. During exhalation, the latissimus dorsi muscle helps decrease the circumference of the trunk, which may have the effect of squeezing more air out.
The latissimus dorsi is also active during violent expiration, as it attaches to the ribs. During a cough or sneeze, the muscle can be felt pressing forcibly inward, as it acts to compress the thorax and abdomen.
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It is one of the main stabilisers of the spine
The latissimus dorsi muscle, commonly known as the 'lats' muscle, is the widest muscle in the human body. It is a large, flat muscle that covers almost all back muscles at the posterior trunk, except the trapezius. The latissimus dorsi is responsible for extension, adduction, transverse extension (also known as horizontal abduction or horizontal extension), flexion from an extended position, and (medial) internal rotation of the shoulder joint.
The latissimus dorsi is one of the main stabilisers of the spine during its various movements. It has a synergistic role in the extension and lateral flexion of the lumbar spine. It also assists as a muscle of both forced expiration (anterior fibres) and an accessory muscle of inspiration (posterior fibres). The latissimus dorsi enhances the movements of the trunk during inhalation and exhalation. It lifts (expands) the circumference of the rib cage when you inhale, which may increase the volume of air that enters your lungs. During exhalation, the latissimus dorsi muscle helps decrease the circumference of the trunk, which may have the effect of squeezing more air out.
The latissimus dorsi is also active during violent expiration, as it attaches to the ribs. During a cough or sneeze, the muscle can be felt pressing forcibly inward, as it acts to compress the thorax and abdomen. The muscle assists in holding the scapula against the thorax during upper limb movements. The attachment of the muscle to the inferior angle of the scapula allows this. In activities such as walking with crutches, where the humerus becomes the fixed point when standing, the latissimus dorsi has the ability to pull the trunk forwards relative to the arms. With this action, there is also a lifting of the pelvis.
The latissimus dorsi is implicated in patients with restrictions of motion of abduction, flexion and lateral rotation. Assessment of this muscle is crucial for patients with upper extremity pathology. For patients with low back pain, it is important to assess the length and flexibility of the latissimus dorsi due to the attachments on the spine and pelvis. A decrease in length or an increase in stiffness of this muscle can lead to alterations in movement patterns and/or postures which can exacerbate low back pain.
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It is a potential source of muscle for breast reconstruction surgery
The latissimus dorsi is a large, flat muscle on the back that stretches to the sides, behind the arm. It is commonly known as the "lats", especially among bodybuilders. This muscle is responsible for extension, adduction, transverse extension, flexion from an extended position, and (medial) internal rotation of the shoulder joint. It also plays a role in the extension and lateral flexion of the lumbar spine.
The latissimus dorsi is a potential source of muscle for breast reconstruction surgery, also known as a latissimus dorsi flap. This procedure involves taking the latissimus dorsi muscle, along with the skin and fat that covers it, from the back and moving it to the front of the chest, with the arteries and veins still attached. This type of surgery is particularly useful for women who are active in sports such as golf, climbing, swimming, or tennis, or for those who do not have enough tissue in the abdomen for other types of reconstruction, such as TRAM flaps. It can also be a good option for patients who need additional tissue coverage or who have had prior complications with other forms of reconstruction.
During breast reconstruction surgery, the surgeon will take the latissimus dorsi muscle from the lower back while leaving it attached to the upper arm to maintain its blood supply. The muscle is then tunnelled under the skin, moved below the armpit, and used to form a new breast shape. This procedure can be combined with an implant to achieve a larger breast size or create a more symmetrical look. The flap provides additional tissue to cover the implant, resulting in a more natural appearance and feel.
It is important to note that there may be potential risks and complications associated with the latissimus flap procedure, including infection, fluid buildup, scarring, or issues with wound healing. Additionally, there is a small risk of back weakness. Patients should consult with their doctor to understand the potential risks and benefits of this procedure and to determine if it is a suitable option for their individual needs.
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It can be injured due to overuse, poor posture, or poor form in sports and exercise
The latissimus dorsi, or lats, is a large muscle in the back that is essential for everyday movement and everyday life. It is a broad, flat muscle that occupies the majority of the lower posterior thorax and is known for its large, flat "V" shape. The lats can be injured due to overuse, poor posture, or poor form during sports and exercise.
Overuse injuries can occur when a person repeatedly performs the same movement, causing micro-tears in the muscle fibres. This can happen during sports or exercise activities that involve a lot of repetitive motions, such as swimming, rowing, or throwing. Poor posture can also lead to latissimus dorsi injuries, as slouching or hunching over can put strain on the muscle. This is especially common in people who sit for long periods, such as those who work at a desk.
Poor form during sports and exercise can also cause latissimus dorsi injuries. This can happen when a person uses incorrect technique or form during activities that involve the lats, such as chin-ups, swimming, or throwing. For example, if a person arches their back too much during a swimming stroke, it can put strain on the lats and lead to injury. Similarly, if a person does not properly warm up or stretch before exercising, they may be more likely to injure their lats.
To prevent latissimus dorsi injuries, it is important to maintain good posture and avoid slouching. It is also crucial to properly stretch and warm up before exercising or playing sports. Additionally, drinking plenty of water throughout the day, especially before and after exercising, can help prevent latissimus dorsi injuries. Finally, if you feel any pain or tightness in your lats, it is important to rest and do some home exercises to loosen the muscle.
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Frequently asked questions
The latissimus dorsi muscle, commonly known as the 'lats' muscle, is the widest muscle in the human body. It is a large, flat muscle that covers almost all back muscles at the posterior trunk, except the trapezius.
The primary function of the latissimus dorsi muscle is in upper extremity movement. It is responsible for extension, adduction, transverse extension, flexion from an extended position, and internal rotation of the shoulder joint. It also assists in the act of side bending, or lateral flexion. The latissimus dorsi is also an accessory respiratory muscle, assisting with inspiration and expiration.
The latissimus dorsi muscle can be trained by performing strength exercises such as chin-ups, rock climbing, swimming, weightlifting, pull-ups, and bench presses.
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