Scalene

Original Editor - Joshua Samuel

Description

Scalene are a group of three pairs of muscles in the lateral neck: scalenus anterior, scalenus medius and scalenus posterior. Sometimes a fourth muscle, the scalenus minimus is present behind the lower portion of the scalenus anterior. The brachial plexus and subclavian artery pass between the anterior and middle scalenes, while the subclavian vein and phrenic nerve pass anteriorly to the anterior scalene as the muscle crosses over the first rib.

Scalenemuscles.jpg


Origin

  • Scalenus Anterior: Anterior tubercles of the transverse processes of vertebrae C3-C6
  • Scalenus Medius: Posterior tubercles of the transverse processes of vertebrae C2-C7
  • Scalenus Posterior: Posterior tubercles of the transverse processes of vertebrae C5-C7

Insertion

  • Scalenus Anterior: Scalene tubercle of the first rib
  • Scalenus Medius: Upper surface of the first rib behind the subclavian artery
  • Scalenus Posterior: Lateral surface of the second rib

Nerve Supply

  • Scalenus Anterior: Brachial plexus, C5-C7
  • Scalenus Medius: Brachial plexus, C3-C8
  • Scalenus Posterior: Brachial plexus, C7-C8

Blood Supply

Ascending cervical artery, a branch of the Thyro-cervical trunk for all the 3 divisions of the Scalenus muscle.

Action

Flexes & rotates neck

Function

The action of the anterior and middle scalene muscles is to Elevates the first rib; flexes and laterally bends the neck to same side.The action of the posterior scalene is to elevate the second rib and tilt the neck to the same side.

They also act as accessory muscles of inspiration, along with the sternocleidomastoids[1]

Pathologies:

Scalene myofascial pain syndrome is a regional pain syndrome wherein pain originates over the neck area and radiates down to the arm. This condition may present as primary or secondary to underlying cervical pathology.[2]Trigger point activity in the Scalene muscle group plays a significant role in many upper body pain complaints. A therapist must know this muscle group and its trigger points very well if they are to offer effective solutions to their client’s chest pain, upper back pain, shoulder pain, radiating arm pain or thoracic outlet syndrome, wrist pain, and hand pain complaints.

                                                    Scalene referral.jpg


These trigger points can cause chest pain and breathing difficulties, many clients become very concerned that they are experiencing cardiac symptoms[3].Clinical diagnoses to which this muscle symptoms may contribute are:

Activities that cause scalene pain and symptoms:

Whiplash injuries
Excessive coughing
Gasping for air (people who suffer with asthma, emphysema, or have bronchitis or pneumonia are especially susceptible to problematic scalene muscles
Pulling or lifting with arms level with the waist
Working for long-periods with head turned to one side (“word-processor headache”)
Sleeping on your stomach with your head turned to one side
Carrying a heavy backpack or purse
Wearing a tight collar or tie.[4]

Test for scalene:

Individual Position: The individual is lying supine with their head elevated and rotated to the contralateral side to be assessed; with their hands raised above their head.

Practitioner Position: The practitioner is standing at the head of the table with the fingers of their hand on the forehead of the individual.

Description of Muscle Test: The individual is requested to flex their head to their chest against the practitioner’s mild resistance.

                                                            Image001 (1).jpg

Treatment:

The first thing you need to do to get rid of your scalene trigger points is to eliminate the underlying causes.[4]

  • Gently place the tips of the fingers on your right hand on the left side of your neck. Hold with slight pressure on a spot on the side of the neck. Repeat in a slightly different area of the neck and to both sides.Repeat 5 to 10 times on both sides of the neck.[5]

    Scalenes-trigger.jpg                       Scalene self release.jpg


It may be helpful to apply a hot pack or heating pad across the neck for 10 to 15 minutes before performing this stretch. Between stretches, use proper diaphragmatic breathing, taking deep, slow, breaths, to relax the neck.

  • To stretch Lie supine (face up) in your bed or on the floor

Lower and anchor the shoulder of the side to be stretched by placing that side's hand under your buttock
Bring the opposite hand over your head so that your fingers make contact with the top of the ear.
Gently pull the head and neck so that it tilts to the opposite side of the side you want to stretch, relaxing your neck muscles as you do so. Try to pull your ear down to your shoudler.

  • Now, you will rotate your head, and the degree of rotation will determine which scalene is targeted.
  1. To target the posterior scalene, turn your face toward the arm that is pulling
  2. To target the anterior scalene, turn your face away from the pulling arm.
  3. To target the middle scalene, look straight up at the ceiling, or just slightly toward the pulling arm.

Concentrate your efforts on the muscle that feels the tightest when you rotate your head to target that muscle
Hold the stretch for around six to seven second.



  • To strength scalene Sit in a comfortable chair. Place the palm of your right hand on the right side of your head. This hand acts as a stabilizer in the exercise. Begin to move your right ear toward your right shoulder while maintaining the resistance provided by your right hand. Repeat 8 to 12 times on each side. By strengthening the scalene muscle you will increase your ability to stabilize your cervical spine, which reduces the risk of a future injury.[6]

Recent Related Research (from Pubmed)

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References

  1. http://en.wikipedia.org/wiki/Scalene_muscles
  2. Scalene Myofascial Pain Syndrome Mimicking Cervical Disc Prolapse: A Report of Two CasesfckLRNizar Abd Jalil,1 Mohammad Saufi Awang,2 and Mahamarowi Omar1
  3. https://www.painscience.com/articles/spot-04-scalenes.php
  4. 4.0 4.1 http://www.gustrength.com/muscles:scalene-muscles-location-actions-trigger-points
  5. http://healthyliving.azcentral.com/scalene-muscle-exercises-5951.html
  6. http://healthyliving.azcentral.com/scalene-muscle-exercises-5951.html