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The Importance of the Long Thoracic Nerve in Shoulder Function

Can understanding the anatomy and function of the long thoracic nerve help individuals make informed healthcare decisions after an injury to the nerve?

Long Thoracic Nerve

Also referred to as the posterior thoracic nerve, the long thoracic nerve/LTN is a thin superficial nerve that runs from the cervical spine to the chest wall side of the trunk. It supplies motor function to the thorax’s serratus anterior muscle, helping stabilize the shoulder blade. Injury to this nerve can cause limited or abnormal shoulder and shoulder blade motion, including difficulty raising the arm during overhead reaching.

Anatomy

The long thoracic nerve originates from the ventral rami of cervical nerves C5, C6, and C7. (Waxenbaum JA, Reddy V, Bordoni B. 2023) In some individuals, the root from C7 is absent; in others, a small nerve root branches from C8. The nerve roots from C5 and C6 go through the medial scalene muscle to join the C7 nerve. It travels behind the brachial plexus axillary artery and vein and courses down the lateral side of the thorax. The long thoracic nerve terminates at the lower portion of the serratus anterior muscle, sending small nerve tendrils to each muscle’s projections, which attach to the ribs. Because the long thoracic nerve is located on the lateral side of the chest, it is vulnerable to injury during sports or surgical procedures. The nerve also has a smaller diameter than other cervical and brachial plexus nerves, which increases its potential for injury.

Function

The long thoracic nerve attaches to the underside of the shoulder blade and inserts as muscular slips into the ribs. It supplies motor function to the serratus anterior muscle, essential for normal shoulder motion. When it contracts, it pulls the shoulder blade against the ribs and thorax, helping to move and stabilize the arm as it moves forward and up during shoulder motions. Injury to the long thoracic nerve causes a condition called scapular winging. This occurs when the serratus anterior muscle becomes weakened or paralyzed after injury. (Lung K, St Lucia K, Lui F. 2024)

Susceptibility to Injury

The LTN is relatively unprotected and can be damaged by several things, including:

  • Heavy backpacks
  • Sports
  • Activities the body is not used to, like digging
  • Using crutches

Conditions

Injury to the long thoracic nerve may occur as a result of trauma, lifting heavy weights above the shoulder, or a surgical procedure. Surgical procedures that may place the nerve at risk for injury may include: (Lung K, St Lucia K, Lui F. 2024)

  • Axillary lymph node dissection
  • Improperly placed intercostal drains
  • Chest tube placements
  • Mastectomy
  • Thoracotomy

The long thoracic nerve is protected during these procedures by the surgeon and proper surgical technique, but occasionally, difficulties arise during surgery, and the nerve may become injured. Individuals may also have an anatomical variance that places their nerves in varying positions. The surgeon may not see it and accidentally injure their nerves during surgery.

The superficial long thoracic nerve may also be injured during sports or trauma to the trunk. A blow to the side or a sudden overhead stretch to the shoulder may be enough to damage the nerve, paralyzing the serratus anterior muscle.

Weakness or paralysis of the serratus anterior muscle will result in a winged scapula. To test for this:

  • Stand about two feet from a wall, facing it.
  • Place both hands on the wall and gently push against it.
  • If one of the shoulder blades sticks out abnormally, it could be a winged scapula.
  • Have a family member or friend stand behind you and check the shoulder blade position.
  • If you suspect a winged scapula, visit a physician who can assess the condition and determine if there is a long thoracic nerve injury.

Winging the scapula may result in difficulty lifting the arm overhead. The serratus anterior muscle works with other scapular stabilizers, such as the upper trapezius and levator scapula, to properly position the shoulder blade when lifting the arm. Failure of the serratus to stabilize the shoulder blade may make lifting the arm impossible.

Clinical examination is usually used to diagnose a long thoracic nerve injury. X-rays and MRIs cannot show the nerve injury directly, although an MRI can show some secondary signs to help confirm the diagnosis. An electromyographic or EMG test may also be performed to examine the function of the long thoracic nerve.

Treatment and Rehabilitation

Treatment for LTN pain and reduced movement may include:

  • Rest
  • Heat or ice
  • Anti-inflammatory pain medication
  • Neck support or a pillow
  • Avoiding strenuous activity and driving

If the long thoracic nerve is severely injured and the serratus anterior is completely paralyzed, the best course of action is to be active and monitor the condition. Full recovery of arm function can take one to two years. If permanent nerve injury has occurred, surgery may be an option to restore shoulder motion and function. Several different kinds of surgery can be used to address winged scapula. (Vetter M. et al., 2017)

  • One involves transferring the pectoralis major tendon to the scapula (Vetter M. et al., 2017) so it functions as the serratus.
  • Often, the tendon has to be lengthened, which may be done using part of the hamstring tendon.
  • After surgery, individuals will likely wear a sling on their arm for a few weeks, and then gentle range-of-motion exercises will be initiated.
  • After eight to ten weeks, gentle progressive strengthening of the new tendon can begin.
  • Full shoulder motion and strength recovery are expected six to 12 months after surgery.

Physical therapy may be used to help improve serratus anterior functions. (Berthold J. B., Burg T. M., & Nussbaum R. P. 2017) Exercises to strengthen serratus function may include:

Supine Punches

  • Lie on your back and raise both arms toward the ceiling.
  • Make a fist and punch up toward the ceiling.
  • Ensure the motion is steady and deliberate, and keep the elbow straight.
  • Hold the position for three seconds, then slowly lower the arm to the starting position.
  • Perform 10 to 15 repetitions.
  • Holding a small dumbbell in your hands can make the exercise more challenging.

Pushup

  • Lie on your stomach and place your hands flat on the ground by your shoulders as if you were going to perform a pushup.
  • Perform a pushup and press further, allowing the shoulder blades to wrap around the thorax.
  • Hold this position for three seconds, and slowly release.
  • Perform 10 to 15 reps.
  • If this is too difficult, perform the pushup against a wall to reduce the effect of gravity on the exercise.

Scapular Winging in Depth

References

Waxenbaum, J. A., Reddy, V., & Bordoni, B. (2024). Anatomy, Head and Neck: Cervical Nerves. In StatPearls. https://www.ncbi.nlm.nih.gov/pubmed/30844163

Lung, K., St Lucia, K., & Lui, F. (2024). Anatomy, Thorax, Serratus Anterior Muscles. In StatPearls. https://www.ncbi.nlm.nih.gov/pubmed/30285352

Vetter, M., Charran, O., Yilmaz, E., Edwards, B., Muhleman, M. A., Oskouian, R. J., Tubbs, R. S., & Loukas, M. (2017). Winged Scapula: A Comprehensive Review of Surgical Treatment. Cureus, 9(12), e1923. https://doi.org/10.7759/cureus.1923

Berthold, J. B., Burg, T. M., & Nussbaum, R. P. (2017). Long Thoracic Nerve Injury Caused by Overhead Weight Lifting Leading to Scapular Dyskinesis and Medial Scapular Winging. The Journal of the American Osteopathic Association, 117(2), 133–137. https://doi.org/10.7556/jaoa.2017.025

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Exploring the Importance of Planes of Motion

Can understanding the planes of motion help individuals adjust fitness training to maximize fitness for physical and sports performance and reduce the risk of injury?

Planes of Motion

The body’s planes of motion are the sagittal, frontal, and transverse planes, which divide it into left and right, front and back, and top and bottom halves. The body moves in different dimensions during daily work, house chores, and physical activity/exercises. The movements in each plane correspond to forward/backward, side-to-side, and rotational motions. Think of each plane as an imaginary line or a pane of glass that divides the body into opposing segments when standing in the anatomical position. (National Academy of Sports Medicine, 2024)

  • Sagittal plane -Divides the body into right and left sides.
  • Frontal plane – Divides the body into front and back.
  • Transverse plane – Divides the body into top and bottom sections.

To determine the plane of motion of a particular movement, consider how the movement would interact with the imaginary lines or plates. When a movement runs parallel to the imaginary line, the movement is occurring in that plane of motion. For example, when going upstairs, the forward and upward movement at the hip, knee, and ankle occurs primarily in the sagittal plane because that movement runs parallel to the imaginary line that divides the body into right and left sides. Frontal plane movements occur while you walk up the stairs and reach for the handrail. The movement is in the frontal plane because the lateral hand reach runs parallel to the line, dissecting the body into front and back sections. If you turn around to look behind, the rotational movement occurs in the transverse plane because your upper torso runs parallel to the line, dissecting the body into an upper and lower section. Individual movements at any joint in the body can occur in a single plane or multiple planes. Complex movements usually happen in several planes of motion concurrently.

Sagittal Plane

Movement in the sagittal plane generally happens in front or behind. This is the most familiar plane of motion because many typical day-to-day activities happen within arm’s reach in front. Walking, texting, or computer work involves movement primarily in the sagittal plane.  Several eating mechanics occur in the sagittal plane. Movements include:

  • Flexion – A bending movement that decreases the angle at a joint
  • Extension – An extending movement that increases the angle at a joint
  • Hyperextension – Extending the angle at a joint beyond neutral
  • Dorsiflexion – Bending at the ankle so the top of the foot moves toward the shin
  • Plantarflexion – Pushing the foot down and away from the body

Many strength-training exercises in the sagittal plane include biceps curls, forward or reverse lunges, squats, vertical jumping, running, downward dog, and yoga chair poses.

Frontal Plane

The frontal plane divides the body into front/anterior and back/posterior sections. Frontal plane movements are lateral or side-to-side and include:

  • Abduction – Moving the body or a limb laterally and away from the body’s midline.
  • Adduction – Moving the body or a limb towards the body’s midline.
  • Elevation – Moving the shoulder blades up.
  • Depression – Moving the shoulder blades down.
  • Eversion – Rolling the foot towards the inside/medial side.
  • Inversion – Rolling the foot towards the outside/lateral side.

Frontal plane movements are less common than sagittal movements. For example, individuals walk forward more than side to side or reach for something in front rather than directly to the side. Frontal plane movements in fitness include side lunges, lateral shoulder raises, and side shuffles, and in yoga poses, standing side bends and the triangle.

Transverse Plane

The transverse plane divides the body into upper/superior and lower/inferior sections. Transverse plane movements generally involve rotation. Movement in this plane is less common. Exercise injuries most often occur during transverse/rotational movements. (National Academy of Sports Medicine, 2024) Movements include:

  • Rotation – Moving the torso or a limb around its vertical axis.
  • Pronation – Rotating the forearm or foot to a palm-side or foot-side down position.
  • Supination – Rotating the forearm or foot to a palm-side or foot-side-up position.
  • Horizontal Abduction – Moving the upper arm away from the body’s midline when elevated to 90 degrees.
  • Horizontal Adduction – Moving the upper arm towards the body’s midline when elevated to 90 degrees.

Typical everyday activities in the frontal plane include turning the head to look behind or turning a doorknob. Exercises in the transverse plane include hitting a golf ball, swinging a baseball bat, or performing a seated twist.

Training Within the Planes of Motion Benefits

Training in all three planes can help with movement in several ways, providing greater ease in life and sports.

Prepares Body for Daily Tasks

Many traditional strength-training programs focus on training one muscle at a time, often in a single plane of motion. For example, weight lifters might do bicep curls to primarily work the biceps in the sagittal plane, a chest fly exercise to primarily work the pectoral muscles in the transverse plane, or lateral raises to work the shoulders in the frontal plane. However, compound exercises have recently become much more common. Compound movements allow individuals to train several muscle groups simultaneously and in different planes of motion.

In this way, training activities mimic daily living activities. For example, individuals often lift several heavy bags of groceries and turn to open the car or trunk, involving both sagittal and transverse movement. Preparing the body for complex activities with compound exercises allows individuals to perform them more easily throughout the day.

Prepares Body for Sports and Physical Activities

Complex multi-planar movements help prepare for safe and effective physical activity and sports performance (National Academy of Sports Medicine, 2024). Researchers and experts understand that many physical and athletic activities require the body to move in different directions, often quickly and under high stress. Several studies have found that anterior cruciate ligament/ACL injuries are more likely to occur during multi-planar rather than single-planar movements. (Quatman C. E., Quatman-Yates C. C., & Hewett T. E. 2010) Training the body to perform multi-planar movements safely and effectively through exercise can help reduce the risk of injury during daily activities or stressful athletic competitions.

Encourages Variation For Full Body Strengthening

Individuals tend to fall into certain movement patterns, such as repeatedly performing the same fitness activity or exercises. This can cause them to have a favorite plane of motion. One way to break away from the same routine is to include movement from all planes of motion. For example, many abdominal workout machines help train in multiple planes of motion, challenging your body to move in different ways. Dumbbells, kettlebells, TRX straps, and bands allow individuals to move joints freely in various planes of motion and work several muscles.

Runners train primarily in the sagittal plane, even if they cross-train by swimming, cycling, or using cardio machines. For this reason, trainers and coaches often recommend doing some form of yoga or weight training that allows them to move their joints in different ways, including lateral movements or rotation. Even flexibility training should incorporate all three planes of motion. For example, walkers might choose to do a simple calf or hamstring stretch at the end of their workout but may also benefit from a seated spine rotation or a lying hip stretch.

Injury Medical Chiropractic and Functional Medicine Clinic

Understanding the concept and importance of training in the three planes of motion can help improve sports and physical performance and prevent musculoskeletal injuries. Chiropractic care aims to help individuals enhance movement with less pain due to condition, after injury, or surgery. Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to build optimal health and wellness solutions. We focus on what works for you to relieve pain, restore function, prevent injury, and help mitigate issues through adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal problems.

The Difference of Using Custom Foot Orthotics

References

National Academy of Sports Medicine. (2024). Sagittal, Frontal and Transverse Body Planes: Exercises & Movements. NASM. https://blog.nasm.org/exercise-programming/sagittal-frontal-traverse-planes-explained-with-exercises?utm_source=blog&utm_medium=referral&utm_campaign=organic&utm_content=ReasonsToBecomeCES

Quatman, C. E., Quatman-Yates, C. C., & Hewett, T. E. (2010). A ‘plane’ explanation of anterior cruciate ligament injury mechanisms: a systematic review. Sports medicine (Auckland, N.Z.), 40(9), 729–746. https://doi.org/10.2165/11534950-000000000-00000