Dominic Stone
The latissimus dorsi, commonly known as the 'lats', is a large, flat muscle that covers the width of the middle and lower back. It is the widest muscle in the human body. The lats are responsible for several functions, including extension, adduction, internal rotation of the shoulder joint, and assisting in breathing. The lats work with other muscles such as the teres major and pectoralis major to perform these actions. Injury to the lats can cause pain and affect the range of motion in the arms and trunk.
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What You'll Learn
The latissimus dorsi is the widest muscle in the human body
The latissimus dorsi, commonly known as the lats, is the widest muscle in the human body. It is a large, flat muscle that covers the width of the middle and lower back. The muscle is relatively thin and covers almost all back muscles at the posterior trunk, except the trapezius. The latissimus dorsi is a climbing muscle. With the arms fixed above the head, it can raise the trunk upwards, together with the help of the pectoralis major. It is an important muscle in rowing, swimming (especially during the downstroke), and chopping.
The latissimus dorsi is a broad, flat muscle that occupies the majority of the lower posterior thorax. The muscle's primary function is in the upper extremity, but it is also considered a respiratory accessory muscle. Along with the levator scapulae, trapezius, and rhomboid muscles, the latissimus dorsi belongs to the superficial layer of extrinsic back muscles. The muscle 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.
The latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity. Together, these muscles work to adduct, medially rotate, and extend the arm at the glenohumeral joint. The latissimus dorsi, along with the teres major and the sternal head of pectoralis major, is also active in the extension of the humerus. Extension and adduction are strongest when the motion is started from a position of partial flexion or abduction, or a combination of the two motions.
The latissimus dorsi is supplied predominantly by the thoracodorsal artery, a continuation of the subscapular artery, which is a branch of the third part of the axillary artery. The thoracodorsal artery and its venae comitantes enter the muscle at a single point on the anterior surface of the muscle, 6 cm to 12 cm from the bifurcation of the subscapular artery and 1 cm to 4 cm medial to the lateral margin of the muscle. The skin covering the latissimus dorsi muscle is supplied by roots T4 to T12, inclusive by both ventral and dorsal rami, as well as the dorsal rami of L1 to L3.
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It is a large, flat muscle that covers the middle and lower back
The latissimus dorsi muscle, commonly known as the lats, is a large, flat muscle that covers the middle and lower back. It is the widest muscle in the human body, stretching to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline. The muscle derives its name from Latin, with "latissimus" meaning "broadest" and "dorsum" meaning "back", thus earning its moniker as the "broadest of the back".
The latissimus dorsi is a climbing muscle that can raise the trunk upwards when the arms are fixed above the head. It is an important muscle in rowing, swimming, and chopping. The muscle is also active during violent expiration, as it attaches to the ribs and aids in coughing and sneezing. The latissimus dorsi is further classified as an accessory breathing muscle, enhancing the movements of the trunk during inhalation and exhalation.
In terms of function, the latissimus dorsi collaborates with the teres major and pectoralis major muscles to perform actions of the upper extremity. Together, these muscles work to 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 a chin-up.
The latissimus dorsi is susceptible to injury, particularly with overuse or improper technique in sports or similar activities. Pain in this muscle can manifest as a result of muscle pulls, strains, or tears. It is important to consult a healthcare professional for proper diagnosis and treatment, which may include rest, anti-inflammatory medication, moist heat, and physical therapy.
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It is also an accessory breathing muscle
The latissimus dorsi muscles, or "lats", are triangular back muscles located below the shoulder blade and to the left and right of the spine. The lats are large muscles, extending from the shoulder blades, across the back, and to the pelvis.
The latissimus dorsi muscles are accessory respiration muscles, meaning they support major breathing muscles such as the diaphragm. They help you take deep breaths by expanding and contracting your chest. They are also active when you cough or sneeze. You will use these muscles more if you have breathing and lung problems such as chronic obstructive lung disease or respiratory muscle fatigue.
The lats help you breathe and are involved in strong breathing-related actions such as coughing and sneezing. They are also active during violent expiration, as they attach 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 muscles support upper-body movement. They help your shoulders move in different directions, including pulling, reaching forward, and rotation. They also help you perform physical activities that involve pulling the body upward and forward while your arms are over your head, such as rowing, pull-ups, or "muscle-up" exercises.
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The lats can be injured through overuse or incorrect form when exercising
The latissimus dorsi, or "lats", is a large, flat muscle on the back that stretches to the sides, behind the arm. It is one of the largest muscles in the body and is used in everyday activities such as standing, walking, and sitting. The lats can be injured through overuse or incorrect form when exercising.
Overuse of the lats can lead to muscle strains or tendonitis, causing pain in various places throughout the body. This can include the shoulder blade, upper and lower back, arms, or fingers. The pain often worsens when a person extends their hands to the front, raises their hands above their head, or throws an object. Poor posture or technique, and a failure to warm up before exercising can also contribute to lat muscle strain. Playing sports that involve repetitive movements, such as baseball and golf, can overstretch the lats and lead to pain and reduced mobility.
Athletes are at a particularly high risk of tearing the latissimus dorsi. Water skiers, golfers, baseball pitchers, rock climbers, track athletes, volleyball players, and gymnasts are more likely to suffer from this injury. However, it is important to note that a serious injury can also cause a tear in this muscle.
To prevent injury to the lats, it is crucial to maintain good posture and avoid slouching. Proper warm-up and cool-down routines, including stretching, can also help to reduce the risk of strain. Applying a heating pad to the back before exercising and drinking plenty of water throughout the day are further preventive measures.
If latissimus dorsi pain occurs, it usually goes away with rest, physical therapy, and specific exercises. Yoga poses, for example, can help reduce pain and strengthen the muscle. In some cases, a doctor may recommend surgery, especially if the pain persists. They may use an MRI scan to assess the injury and determine the best treatment approach.
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The muscle is important for climbing, swimming and rowing
The latissimus dorsi muscle is a large, flat muscle that covers most of the lower posterior thorax. It is often referred to as 'lats' and is one of the superficial extrinsic back muscles. The latissimus dorsi muscle is essential for movements of the upper extremity, particularly the arm and shoulder.
The muscle is responsible for several movements of the arm at the glenohumeral joint, including adduction, internal rotation, and extension. It also assists in moving the trunk forward and upward when the arms are fixed overhead, as in climbing or performing a chin-up. This quality of the muscle makes it especially important for climbing, as it helps to raise the trunk upward when the arms are in a fixed position above the head. The muscle is also active during violent expiration, such as coughing or sneezing, and it attaches to the ribs, compressing the thorax and abdomen.
The latissimus dorsi muscle is also crucial for swimmers, especially during the downstroke phase of the stroke. It works in collaboration with the teres major and pectoralis major muscles to perform actions requiring upper-body strength. Together, these muscles help in extending and adducting the arm, with the strongest movements occurring when started from a position of partial flexion or abduction.
In rowing, the latissimus dorsi muscle is essential for the backward movement of the body, as it helps to pull the trunk forward relative to the arms. This action also results in a lifting of the pelvis. Therefore, the latissimus dorsi muscle, or 'lats', play a significant role in climbing, swimming, and rowing due to their ability to produce various movements in the shoulder and arm, as well as assist in trunk movement.
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Frequently asked questions
The latissimus dorsi muscle, also known as the 'lats' muscle, is the widest muscle in the human body. It is a large, flat muscle that covers the width of the middle and lower back.
The latissimus dorsi is located in the lower posterior thorax, covering the serratus posterior muscles. It is one of the superficial layer of extrinsic back muscles.
The primary function of the latissimus dorsi muscle is related to the upper extremity. It works with the teres major and pectoralis major muscles to perform actions such as adduction, medial rotation, and extension of the arm at the glenohumeral joint. The latissimus dorsi is also involved in breathing, assisting in inhalation and exhalation.
The latissimus dorsi muscle can be injured through overuse, poor technique in sports or exercises, or not using the correct form while exercising. It is important to consult a healthcare professional for proper diagnosis and treatment.
Some exercises that target the latissimus dorsi muscle include vertical pulling movements such as pull-downs and pull-ups, horizontal pulling movements such as bent-over rows, and shoulder extension movements with straight arms such as straight-arm lat pulldowns.
