Manual Muscle Test

Upper Trapezius

· 1. Neurological & Functional Insights

· Integrates visual, vestibular, and cervical proprioceptive inputs to regulate head–neck orientation and scapular positioning.

· Contributes to head-righting reflexes, cervico-ocular coordination, and upper thoracic extension during dynamic movement.

· Coordinates with deep cervical stabilizers to maintain head alignment during gait and overhead activity.

· 2. Clinical Relevance

· Commonly overactive in forward-head posture and prolonged sitting.

· Contributes to tension headaches, upper cervical discomfort, and altered scapular mechanics.

· Increased recruitment seen when diaphragmatic function is reduced.

· 3. Origin

· External occipital protuberance

· Medial superior nuchal line

· Ligamentum nuchae

· Spinous processes C1–C7

· 4. Insertion

· Lateral one-third of clavicle

· Acromion

· Spine of the scapula

· 5. Innervation

· Spinal accessory nerve (CN XI)

· C3–C4 (sensory/proprioceptive)

· 6. Actions – Open Kinetic Chain (OKC)

· Scapular elevation

· Upward rotation

· Ipsilateral cervical side-bending

· Contralateral cervical rotation

· Assists cervical extension

· 7. Actions – Closed Kinetic Chain (CKC)

· Scapular stabilization during loading

· Supports cervical extension when shoulder girdle is fixed

· Elevates upper ribs during accessory inspiration

· 8. Associated Ligaments

· Ligamentum nuchae

· Sternoclavicular ligament

· Cervicothoracic fascia

· 9. Associated Organs

Fascial:

· Pleural dome

· Deep cervical fascia

· Upper mediastinum

Viscerosomatic:

· T1–T5 (cardiac)

· T2–T7 (pulmonary)

TCM:

· Gallbladder meridian

VM:

· Pleural and mediastinal tension influencing upper trapezius tone

Middle Trapezius

· 1. Neurological & Functional Insights

· Provides major proprioceptive input for mid-thoracic orientation and scapular positioning.

· Central stabilizer for horizontal scapular alignment.

· Balances anterior–posterior scapular forces during arm motion.

· 2. Clinical Relevance

· Weakness contributes to scapular protraction, rounding, and thoracic collapse.

· Often inhibited in individuals with thoracic kyphosis.

· Important for restoring proper pulling mechanics.

· 3. Origin

· Spinous processes T1–T5

· 4. Insertion

· Medial margin of scapular spine

· 5. Innervation

· Spinal accessory nerve (CN XI)

· C3–C4

· 6. Actions – Open Kinetic Chain (OKC)

· Scapular retraction

· 7. Actions – Closed Kinetic Chain (CKC)

· Scapular stabilization during pushing and pulling

· Supports thoracic extension during upper-limb tasks

· 8. Associated Ligaments

· Thoracic fascia

· Acromioclavicular ligament (via fascial continuity)

· 9. Associated Organs

Fascial:

· Posterior pleural fascia

Viscerosomatic:

· T2–T7

TCM:

· Urinary Bladder meridian

VM:

· Posterior rib restrictions altering middle trapezius activation

Lower Trapezius

· 1. Neurological & Functional Insights

· Key component of the upward rotation force couple during overhead elevation.

· Controls scapular posterior tilt and helps maintain subacromial space.

· Works with serratus anterior for stable overhead mechanics.

· 2. Clinical Relevance

· Frequently inhibited in overhead athletes, sedentary individuals, and shoulder pain cases.

· Weakness contributes to impingement, anterior tilt, and poor overhead control.

· Important for efficient scapular depression and posterior tilt.

· 3. Origin

· Spinous processes T6–T12

· 4. Insertion

· Medial end of the scapular spine

· 5. Innervation

· Spinal accessory nerve (CN XI)

· C3–C4

· 6. Actions – Open Kinetic Chain (OKC)

· Scapular depression

· Upward rotation

· Retraction (lower angle)

· 7. Actions – Closed Kinetic Chain (CKC)

· Stabilizes scapula during overhead activities

· Supports thoracic extension

· 8. Associated Ligaments

· Thoracolumbar fascia

· Posterior scapular fascia

· 9. Associated Organs

Fascial:

· Diaphragmatic fascia

· Thoracic fascia

Viscerosomatic:

· T6–T9

TCM:

· Urinary Bladder meridian

VM:

· Diaphragmatic tension reducing lower trapezius recruitment

Rhomboids

· 1. Neurological & Functional Insights

· Provide powerful scapular fixation to the thorax.

· Important for downward rotation, retraction, and posterior stability.

· High proprioceptive density supporting mid-scapular awareness.

· 2. Clinical Relevance

· Weakness contributes to winging, anterior tilt, and poor rowing mechanics.

· Commonly inhibited when pectoralis minor is shortened.

· Essential for restoring posterior chain balance.

· 3. Origin

· Spinous processes C7–T5

· 4. Insertion

· Medial border of scapula

· 5. Innervation

· Dorsal scapular nerve (C5)

· 6. Actions – Open Kinetic Chain (OKC)

· Scapular retraction

· Downward rotation

· Scapular fixation

· 7. Actions – Closed Kinetic Chain (CKC)

· Stabilizes thorax during pulling

· Supports rib mechanics

· 8. Associated Ligaments

· Costovertebral ligaments

· Thoracic fascia

· 9. Associated Organs

Fascial:

· Posterior ribs and pleura

Viscerosomatic:

· T2–T7

TCM:

· Urinary Bladder / Small Intestine meridians

VM:

· Rib restrictions increasing rhomboid tone

Levator Scapulae

· 1. Neurological & Functional Insights

· Influences cervical loading patterns and rotation mechanics.

· Participates in cervical–scapular coupling.

· Sensitive to sympathetic activation and upper rib mechanics.

· 2. Clinical Relevance

· Ongoing tightness common in forward-head posture and desk workers.

· Associated with cervicogenic headaches and reduced cervical rotation.

· Often overloaded in chronic downward-rotated scapula positions.

· 3. Origin

· Transverse processes C1–C4

· 4. Insertion

· Superior angle of the scapula

· 5. Innervation

· Dorsal scapular nerve (C5)

· C3–C4

· 6. Actions – Open Kinetic Chain (OKC)

· Scapular elevation

· Downward rotation

· Ipsilateral cervical sidebend

· 7. Actions – Closed Kinetic Chain (CKC)

· Provides cervical anchoring during upper-limb load

· 8. Associated Ligaments

· Cervical facet capsules

· Deep cervical fascia

· 9. Associated Organs

Fascial:

· Pleural dome

· Cervical fascia

Viscerosomatic:

· Upper thoracic segments

TCM:

· Gallbladder meridian

VM:

· First-rib restrictions increasing levator scapulae tone

Serratus Anterior

· 1. Neurological & Functional Insights

· Primary anti-winging muscle ensuring scapular adhesion to thorax.

· Drives upward rotation and posterior tilt during elevation.

· Strongly interconnected with rib mobility and respiratory mechanics.

· 2. Clinical Relevance

· Weakness leads to winging, poor overhead mechanics, and reduced upward rotation.

· Inhibited in rotator cuff pathology and dysfunctional breathing.

· Rib stiffness significantly decreases recruitment quality.

· 3. Origin

· Ribs 1–8

· 4. Insertion

· Anterior medial border of scapula

· 5. Innervation

· Long thoracic nerve (C5–C7)

· 6. Actions – Open Kinetic Chain (OKC)

· Protraction

· Upward rotation

· Posterior tilt

· 7. Actions – Closed Kinetic Chain (CKC)

· Thoracic stabilization during pushing

· Maintains rib–scapula integrity

· 8. Associated Ligaments

· Intercostal fascia

· 9. Associated Organs

Fascial:

· Pleural fascia

Viscerosomatic:

· T2–T7

TCM:

· Lung meridian

VM:

· Pleural restrictions decreasing serratus anterior function

Serratus Anterior (Variation)

· 1. Neurological & Functional Insights

· Different fiber orientations produce angle-specific upward rotation and protraction.

· Useful for evaluating selective fiber recruitment in overhead athletes.

· 2. Clinical Relevance

· Helps identify rib-driven dysfunction when standard serratus anterior testing is inconclusive.

· Important in load-bearing and high-angle overhead tasks.

· 3. Origin

· Ribs 1–8

· 4. Insertion

· Medial border of scapula

· 5. Innervation

· Long thoracic nerve

· 6. Actions – Open Kinetic Chain (OKC)

· Angle-specific protraction

· Upward rotation

· 7. Actions – Closed Kinetic Chain (CKC)

· Rib–scapula stabilization across different elevation angles

· 8. Associated Ligaments

· Intercostal fascia

· 9. Associated Organs

Fascial:

· Upper rib fascia

Viscerosomatic:

· Upper thoracics

TCM:

· Lung meridian

VM:

· First–second rib tension affecting serratus anterior fiber recruitment

Subclavius

· 1. Neurological & Functional Insights

· Stabilizes the sternoclavicular joint during arm elevation.

· Influences first-rib mechanics and thoracic outlet dynamics.

· Acts as a tension regulator between clavicle, rib cage, and shoulder girdle.

· 2. Clinical Relevance

· Overactivity may contribute to thoracic outlet symptoms.

· Influences scapular motion through clavicular control.

· Highly active during dysfunctional breathing patterns.

· 3. Origin

· First rib and costal cartilage

· 4. Insertion

· Subclavian groove of clavicle

· 5. Innervation

· Nerve to subclavius (C5–C6)

· 6. Actions – Open Kinetic Chain (OKC)

· Clavicular depression

· Sternoclavicular joint stabilization

· 7. Actions – Closed Kinetic Chain (CKC)

· First-rib stabilization during respiration

· 8. Associated Ligaments

· Costoclavicular ligament

· 9. Associated Organs

Fascial:

· Suprapleural membrane

Viscerosomatic:

· T1–T2

TCM:

· Lung meridian region

VM:

· First-rib restrictions altering subclavius tension

Module references

· Standring S, ed. Gray’s Anatomy: The Anatomical Basis of Clinical Practice. Elsevier.

· Neumann DA. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. Elsevier.

· Kendall FP et al. Muscles: Testing and Function with Posture and Pain. Lippincott Williams & Wilkins.

· Netter FH. Atlas of Human Anatomy. Elsevier.

· Barral JP, Mercier P. Visceral Manipulation. Eastland Press (framework-specific associations).

· Deadman P, Al-Khafaji M, Baker K. A Manual of Acupuncture. Journal of Chinese Medicine Publications (traditional channel associations).

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