Ortho U/E Muscles

Tightness in this muscle creates an anterior pelvic tilt or an anterior pelvic tilt created by tight psoas, weak gluteals, weak deep abdominals can caus tightness of this muscle, predisposing one to glenohumeral impingement

Tightness in this muscle creates glenohumeral IR/adduction (forward shoulders

Weakness in this muscle causes synergistic dominance of subscapularis

This muscle is inhibited by dysfunction at the iliosacral joint, thoracic spine and scapulothoracic joint (arthrokinetic inhibition)

Weakness in this muscle leads to synergistic dominance of the upper trap and levator scapula to initiate arm elevation, leading to glenohumeral impingement 

Weaknes of this muscle leads to scapulothoracic instability, which in turn causes impaired upper extremity elevation and may be the cause of headache symptoms (due to trigger points in the upper trapezius muscle)

Weakness in this muscle decreases scapular stability and increases stress to the rotator cuf (normally acts as a stabilizing synergist for teres maor)

Tightness in this muscle results in a downward rotated position of the scapula which leads to decreased passive stability of the dependent arm and requiring excessive firing of the rotator cuff muscles (especially the supraspinatus) 

Inhibition of this muscle may be created by thoracic spine immobility (i.e. rotated posture to the opposite will shorten; rotated same will lengthen/weaken this muscle

This muscle works synergistically with the upper trapzius and the serratus anterior to upwardly rotate the scapula

Weakness in this muscle allows synergistic dominance of upper trapezius, levator scapula and serratus anterior. 

Thoracic spine dysfunction creates arthrokinematic inhibition of this muscle (excessive kyphosis may lengthen/weaken this muscle)

This muscle stabilizes medial border of scapula, creating a stable base for arm function

This muscle is synergistic to upper, lower trap and serratus anterior

Weakness in this muscle allows pstural compensations (increased scapular protraction)

This muscle is inhibited by tight pectoralis major/minor

This muscle is arthrokinematically inhibited by thoracic spine dysfunction (ex: increased kyphosis)

This muscle is synergistic with lower trapezius and serratus anterior to produce upward rotation of the scapula during arm elevation

Tightness in this muscle may create cerival spine dysfunction

Tightness in this muscle creates reciprocal inhibition of the lower trapezius

Weakness in this muscle decreases force couple relationship of the scapula

This muscle may compensate for functional leg length discrepancy and thoracic spine compensation by shortening or lengthening

Sternoclavicular joint dysfunctioncreates inhibition of this muscle

Tightness in this muscle creates inhibition of rhomboids, mid and lower trapezius

Tightness in this muscle may create rib dysfunction

Tightness in this muscle creates humeral IR

This muscle is synergistic to pectoralis major

Tightness in this muscle crates inhibition of rhomboids, mid/low traps and vice versa

Dysfunction of rib 3-5 will create inhibition of pec minor. affecting respiration and leading to dominance of accesory respiratory muscles (i.e. scalenes)

Anterior and posterior fibers of this muscle act as neutralizers during abduction

Inhibition of this musle creates rotator cuff impingement and may lead to tissue overload of the infraspinatus/teres minor during deceleration activities 

Peripheral axillary nerve entrapment due to tight lats, teres major or triceps will decrease neural input to this muscle, leading to synergistic dominance of the rotator cuff

Tight levator scapula or upper trapezius alters length/tension relationship of this muscle

Tight subscapularis decreases neural drive to this muscle and infraspinatus decreasing caudal glide and dynamic stabilization of the glenohumeral joint