Manual Muscle Test

Brachialis

· 1. Neurological & Functional Insights

· Primary flexor of the elbow regardless of forearm position.

· High proportion of slow-twitch fibers for stability and sustained flexion control.

· Provides strong proprioceptive input for humeroulnar joint alignment.

· 2. Clinical Relevance

· Weakness leads to compensatory overuse of biceps.

· Important for stabilizing the elbow during gripping tasks.

· Often tight in individuals with chronic flexion postures.

· 3. Origin

· Distal half of anterior humerus

· 4. Insertion

· Ulnar tuberosity

· Coronoid process

· 5. Innervation

· Musculocutaneous nerve (C5–C6)

· Radial nerve branch (C7)

· 6. Actions – Open Kinetic Chain (OKC)

· Elbow flexion (primary)

· 7. Actions – Closed Kinetic Chain (CKC)

· Stabilizes humeroulnar joint during weight bearing

· 8. Associated Ligaments

· Anterior elbow capsule

· 9. Associated Organs

Fascial:

· Anterior arm fascia

Viscerosomatic:

· C5–C6

TCM:

· Lung meridian region

VM:

· Anterior arm fascial tension influencing elbow function

Brachioradialis

· 1. Neurological & Functional Insights

· Functions as an elbow flexor strongest in neutral (thumbs-up) position.

· Acts as a dynamic stabilizer for rapid flexion movements.

· High spindle density for rapid reflexive contribution.

· 2. Clinical Relevance

· Tightness common in gripping and manual labor athletes.

· Overuse contributes to lateral elbow pain patterns.

· Important stabilizer during hammering, lifting, pulling.

· 3. Origin

· Lateral supracondylar ridge of humerus

· 4. Insertion

· Radial styloid process

· 5. Innervation

· Radial nerve (C5–C6)

· 6. Actions – Open Kinetic Chain (OKC)

· Elbow flexion (neutral)

· Assists pronation/supination toward neutral

· 7. Actions – Closed Kinetic Chain (CKC)

· Forearm stabilization during load transfer

· 8. Associated Ligaments

· Lateral elbow fascia

· 9. Associated Organs

Fascial:

· Lateral forearm fascia

Viscerosomatic:

· C5–C6

TCM:

· Large Intestine meridian

VM:

· Lateral fascial tension altering brachioradialis tone

Anconeus

· 1. Neurological & Functional Insights

· Assists terminal elbow extension and stabilizes the ulna.

· Important for dynamic posterior elbow stability.

· Contributes to fine control of elbow locking.

· 2. Clinical Relevance

· Often under-recognized contributor to elbow pain syndromes.

· Helps unload triceps during low‑force extension.

· Supports ulnar stability during pushing.

· 3. Origin

· Lateral epicondyle

· 4. Insertion

· Olecranon

· Proximal ulna

· 5. Innervation

· Radial nerve (C7–T1)

· 6. Actions – Open Kinetic Chain (OKC)

· Terminal elbow extension

· Ulna stabilization

· 7. Actions – Closed Kinetic Chain (CKC)

· Posterior elbow stability during weight bearing

· 8. Associated Ligaments

· Posterior elbow capsule

· 9. Associated Organs

Fascial:

· Posterior forearm fascia

Viscerosomatic:

· C7–T1

TCM:

· Triple Burner meridian region

VM:

· Posterior elbow fascial tension patterns

Coracobrachialis

· 1. Neurological & Functional Insights

· Provides anterior GH stability, especially in midrange.

· Synergist with biceps short head for flexion and adduction.

· Contributes to humeral head positioning during forward reach.

· 2. Clinical Relevance

· Tightness can cause anterior humeral glide.

· Underrecognized contributor to shoulder pain patterns.

· Important stabilizer in pushing and horizontal tasks.

· 3. Origin

· Coracoid process

· 4. Insertion

· Medial humeral shaft

· 5. Innervation

· Musculocutaneous nerve (C5–C7)

· 6. Actions – Open Kinetic Chain (OKC)

· Flexion

· Adduction

· 7. Actions – Closed Kinetic Chain (CKC)

· Anterior shoulder stability during reaching

· 8. Associated Ligaments

· Coracohumeral ligament

· 9. Associated Organs

Fascial:

· Coracoid / clavipectoral fascia

Viscerosomatic:

· C5–C7

TCM:

· Lung / Heart region

VM:

· Anterior shoulder fascial tension influencing coracoid cluster

Biceps Brachii (Long & Short Head)

· 1. Neurological & Functional Insights

· Long head stabilizes humeral head superiorly.

· Short head connects scapula to forearm, integrating elbow & shoulder.

· Important proprioceptive contributor to anterior GH mechanics.

· 2. Clinical Relevance

· Overload common in overhead athletes.

· Long head tendinopathy contributes to anterior shoulder pain.

· Important for stabilizing during deceleration.

· 3. Origin

· Long head: supraglenoid tubercle

· Short head: coracoid process

· 4. Insertion

· Radial tuberosity

· Bicipital aponeurosis

· 5. Innervation

· Musculocutaneous nerve (C5–C6)

· 6. Actions – Open Kinetic Chain (OKC)

· Flexion of shoulder

· Elbow flexion

· Supination

· 7. Actions – Closed Kinetic Chain (CKC)

· Anterior GH stability under load

· 8. Associated Ligaments

· Bicipital pulley complex

· 9. Associated Organs

Fascial:

· Bicipital sheath

Viscerosomatic:

· C5–C6

TCM:

· Lung meridian region

VM:

· Bicipital groove fascial drag influencing LH tension

Triceps Brachii (Long Head)

· 1. Neurological & Functional Insights

· Contributes to posterior GH stability.

· Assists in extension and adduction from hyperflexed positions.

· Links scapula to elbow, integrating arm extension mechanics.

· 2. Clinical Relevance

· Important stabilizer during closed-chain upper limb tasks.

· Overload common in weightlifting and throwing.

· Helps resist superior humeral translation.

· 3. Origin

· Infraglenoid tubercle

· 4. Insertion

· Olecranon process

· 5. Innervation

· Radial nerve (C6–C8)

· 6. Actions – Open Kinetic Chain (OKC)

· Shoulder extension

· Adduction

· Elbow extension

· 7. Actions – Closed Kinetic Chain (CKC)

· Posterior humeral stability during load

· 8. Associated Ligaments

· Posterior GH capsule

· 9. Associated Organs

Fascial:

· Posterior shoulder fascia

Viscerosomatic:

· C7–C8

TCM:

· Small Intestine meridian region

VM:

· Triceps fascial continuity affecting posterior GH control

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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