Maximus Gage
The latissimus dorsi muscles, commonly referred to as the 'lats', are a pair of large, flat, triangular muscles located below the shoulder blade and on either side of the spine. They are one of the largest muscles of the back, stretching from the shoulder blades, across the back, and down to the pelvis. The lats play a crucial role in upper extremity movement, internal rotation, adduction, extension, and depression of the arm, as well as assisting with the breathing process. They are also implicated in various sports, with injuries occurring disproportionately in baseball pitchers.
| Characteristics | Values |
|---|---|
| Common names | Latissimus dorsi, lats |
| Location | Lower posterior thorax, below the shoulder blade, left and right of the spine |
| Shape | Triangular, flat |
| Function | Extension, adduction, transverse extension, flexion from an extended position, internal rotation of the shoulder joint, and medial internal rotation of the shoulder |
| Innervation | Thoracodorsal nerve (C6-C8), a branch of the brachial plexus |
| Blood supply | Thoracodorsal branch of the subscapular artery, a branch of the axillary artery |
| Attachments | Vertebral processes of spinal levels T7-L5, thoracolumbar fascia, posterior iliac crest, lower three to four ribs, inferior angle of the scapula |
| Exercises | Pull-downs, pull-ups, bent-over rows, T-bar rows, straight-arm lat pulldowns, pull-overs, dumbbell rows |
| Injuries | Overuse, poor posture, or poor form in sports and exercise, specifically golf, baseball, and swimming |
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What You'll Learn
- The latissimus dorsi muscle is one of the largest muscles in the upper body
- The lats help stabilise your back and shoulders during movement
- The lats are a common source of back and shoulder pain
- The lats are used in exercises such as pull-ups, swimming and climbing
- The lats can be injured during sports such as golf, baseball and swimming
The latissimus dorsi muscle is one of the largest muscles in the upper body
The latissimus dorsi muscle, commonly referred to as the 'lats', is one of the largest muscles in the upper body. It is a large, flat muscle that starts below the shoulder blades and extends along the spine to the pelvis and across the width of the back. The muscle fibres are oriented in different directions, with the uppermost fibres being horizontal and the lower fibres being more vertical.
The latissimus dorsi plays a crucial role in upper body movement and respiratory functions. It assists in depressing the arm and adducting, extending, and internally rotating the shoulder. When the arms are in a fixed overhead position, such as during a chin-up or climbing, the latissimus dorsi pulls the trunk upward and forward, aiding in these movements. Additionally, the muscle is active during deep inspiration and forceful respiratory actions like coughing and sneezing.
The latissimus dorsi is an extrinsic back muscle, originating from the myogenic cells in the developing upper limb buds. It has several attachment points, including vertebrae T7-L5, the thoracolumbar fascia, the posterior iliac crest, the lower three to four ribs, and the inferior angle of the scapula. These fibres then extend towards the axilla, wrapping around the teres major muscle, and inserting on the floor of the intertubercular sulcus of the humerus.
Training the latissimus dorsi provides benefits beyond aesthetics for bodybuilders; it improves everyday movement and overall quality of life. Common exercises that engage this muscle include weightlifting, pull-ups, bench presses, and dumbbell rows. However, it is important to note that excessive tightness in the latissimus dorsi can contribute to chronic shoulder and back pain, so maintaining proper length and flexibility is crucial.
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The lats help stabilise your back and shoulders during movement
The latissimus dorsi muscles, commonly referred to as the "lats", are triangular back muscles located below the shoulder blades, extending across the back to the pelvis. They are the largest muscles in the upper half of the body, and among the largest on the back.
The lats are essential for smooth and fluid upper-body movements. They work in tandem with the teres major and pectoralis major muscles to adduct, extend, and internally rotate the shoulder at the glenohumeral joint. When the arms are in a fixed overhead position, the lats pull the trunk upward and forward, as in climbing or performing a pull-up.
The lats are also implicated in shoulder abduction, flexion, and lateral rotation. A decrease in the length or an increase in the stiffness of this muscle can lead to alterations in movement patterns and postures, which may exacerbate low back pain. Therefore, for patients with low back pain, it is important to assess the length and flexibility of the lats due to their attachments to the spine and pelvis.
The lats can be strengthened through exercises such as pull-ups, chin-ups, rock climbing, swimming, and rowing.
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The lats are a common source of back and shoulder pain
The latissimus dorsi, commonly known as the lats, are the largest muscles in the upper half of the body. They start below the shoulder blades and extend to the spine in the lower back. The lats are responsible for several functions, including extension, adduction, transverse extension, flexion from an extended position, and internal rotation of the shoulder joint.
Due to their size and role in upper body movement, the lats are a common source of back and shoulder pain. Tightness in the lats can lead to sub-optimal glenohumeral joint (shoulder) function, resulting in chronic pain or tendinitis in the fasciae connecting the lats to the spine. Poor posture, such as slouching or adopting a rounded shoulder position, can contribute to lat tightness and subsequent pain.
Latissimus dorsi pain can manifest in several areas, including the shoulder blade, upper and lower back, arms, or fingers. The pain typically worsens with movements such as reaching forward, extending the arms, or reaching overhead. In some cases, a decrease in the length or an increase in the stiffness of the lats can also contribute to low back pain.
To address latissimus dorsi-related pain, various treatments are available. Rest and physical therapy are often recommended, along with stretching and warming up before exercising. Massage, acupuncture, and cryotherapy can also help loosen tight lats and alleviate pain. In more severe cases, nonsteroidal anti-inflammatory drugs may be prescribed to manage pain.
It is important to note that an assessment by an experienced physiotherapist or healthcare provider is crucial to determine the underlying cause of the pain and to rule out other conditions. They can provide specific exercises or treatments targeting the lats to help improve pain and restore function.
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The lats are used in exercises such as pull-ups, swimming and climbing
The latissimus dorsi, or lats, are the largest muscles in the upper half of the body. They start below the shoulder blades and extend to the spine in the lower back. The lats are responsible for several functions, including extension, adduction, horizontal abduction, and internal rotation of the arm.
When performing exercises such as pull-ups, swimming, and climbing, the lats are engaged and play a crucial role in achieving the required movements.
During a pull-up, a wide grip allows for more emphasis to be placed on the lats. The wide-grip pull-up simulates a wide-grip pulldown, which is primarily used for lat development. It is recommended to aim for a good contraction of the lats by getting the chin to the bar level. Additionally, performing pull-ups consistently helps develop functional strength and improves grip and forearm strength.
Swimming is another exercise that engages the lats. The lat pulldown, a multi-joint exercise, is often used by swimmers to target the lats and other back, shoulder, and arm muscles. Research has shown that using a pronated grip (palms away) and pulling to the top of the chest effectively targets the lats.
Climbing also requires the use of the lats. When the arm is fixed overhead, the lats contract and pull the body toward the arm, facilitating the climbing motion.
Overall, exercises such as pull-ups, swimming, and climbing provide an excellent opportunity to strengthen and develop the lats, contributing to overall fitness and functional strength.
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The lats can be injured during sports such as golf, baseball and swimming
The latissimus dorsi, or lats, are the "broadest muscles of the back". They are responsible for extension, adduction, transverse extension, flexion from an extended position, and internal rotation of the shoulder joint. The lats can be injured during sports such as golf, baseball and swimming.
In golf, overuse injuries are common and can affect the lats. This can be caused by a faulty golf swing, which can lead to low back pain, as well as shoulder and wrist injuries. A "C-shaped posture" during the swing, for example, can cause damage to the lats over time.
Baseball pitchers are also susceptible to lat injuries. The layback position, where the arm transitions from external rotation to internal rotation, is a particularly vulnerable time for injury. The latissimus dorsi is very active during this phase, contracting nearly twice as aggressively as during a manual muscle test. This can lead to micro-injuries of the muscles in the arm, including the lat.
Swimming is a great exercise to work on the lats, but it is important to follow a few rules to avoid injury. It is recommended to always warm up before any exercise and to work at a steady pace.
Overall, the lats can be injured in a variety of sports, including golf, baseball and swimming. These injuries can be caused by overuse, faulty technique, or a lack of warm-up, and can result in pain and loss of function in the shoulder, back, and arm.
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Frequently asked questions
Colloquially known as the 'lats', the latissimus dorsi muscles are large, flat muscles that occupy the majority of the lower posterior thorax. They are considered to be accessory respiratory muscles and are involved in moving the upper extremity.
The latissimus dorsi muscles are involved in several functions, including extension, adduction, transverse extension, flexion from an extended position, and internal rotation of the shoulder joint. They also play a role in climbing, swimming and rowing.
There are several exercises that can be performed to train the latissimus dorsi muscles, including pull-downs, pull-ups, bent-over rows, and shoulder extension movements with straight arms.
