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Shoulder muscles

upper extremity

QuestionAnswer
Sternoclavicular Joint lies in clavicular notch of the manubrium and gliding/rotational
Acromioclavicular Joint Slight gliding movement when elevation and depression takes place
Coracoclavicular ligament: Trapezoid more lateral. Opposes forward, upward, and lateral movement of clavicle
Coracoclavicular ligament: Conoid opposes backward, upward, and medial movement
Glenohumeral ligaments lie beneath the anterior surface of the joint capsule and reinforce the capsule
Capsular Ligament attaches anatomical neck to circumference of the glenoid of the scapula
Coracohumeral ligament passes from base of coracoid process to anterior aspect of humerus
Coracoacromial Ligament Functions to limit superior movement of the humeral head
Glenoid lip or labrum helps deepen the glenoid fossa, adding stability to the shoulder joint
Brachial Plexus Constitutes the entire nerve supply for upper extremities and shoulder region
Rotator Cuff Supraspinatus; Infraspinatus; Teres minor; Subscapularis
What is the purpose of the rotator cuff? maintain joint stability
Supraspinatus Origin? Supraspinous fossa
Supraspinatus Insertion? Proximal facet of the greater tubercle
Supraspinatus Action? -Shoulder abduction -Stabilizer of the Glenohumeral (GH) joint
Supraspinatus Synergist? Deltoid
Supraspinatus nerve? Suprascapular Nerve
Infraspinatus Origin? Infraspinous fossa
Infraspinatus Insertion? Middle facet of greater tubercle
Infraspinatus Action? -External/lateral rotation and extension -GH joint stability
Infraspinatus Synergists? Teres minor, post deltoid (external rotation), latissimus dorsi, teres major
Infraspinatus Nerve? Suprascapular Nerve
Teres minor Origin? Upper and middle portions of lateral border of scapula
Teres minor Insertion? Distal facet of greater tuberosity
Teres minor Action? -External rotation and extension -Stabilization of GH joint
Teres minor Synergists? Infraspinatus, post deltoid (external rotation), post. deltoid; latissimus dorsi, teres major
Teres minor Nerve? Axillary Nerve
Subscapularis Origin? Subscapular fossa
Subscapularis Insertion? Lesser tuberosity of the humerus
Subscapularis Action? -Shoulder flexion; medial (internal) rotation -stabilizes GH joint
Subscapularis Synergists? Teres major, pectoralis major, latissimus dorsi (medial rotation)
Subscapularis Nerve? Upper Subscapular and Lower Subscapular
Deltoids Anterior Origin? lateral/anterior clavicle
Deltoids Middle Origin? lateral acromion process
Deltoids Posterior Origin? inferior spine of scapula
Deltoids Insertion? Deltoid tuberosity
Deltoids Anterior Action? adduction*, flexion, internal rotation of shoulder; horizontal adduction
Deltoids Middle Action? abduction of shoulder
Deltoids Posterior Action? adduction*, extension, external rotation of shoulder; horizontal abduction
Deltoids Nerve? Axillary Nerve
Pectoralis minor Origin? Costal bones (ribs) 3-5
Pectoralis minor Insertion? Coracoid process
Pectoralis minor Action? -Downward rotation; protraction; depression of scapula -anterior shoulder stabilizer
Pectoralis minor Synergists? Serratus Anterior (protraction, stabilizer
Pectoralis minor Nerve? Medial Pectoral (C8-T1)
Serratus Anterior Origin? Anterior lateral aspects of upper 9 ribs
Serratus Anterior Insertion? Anterior surface of vertebral border of scapula
Serratus Anterior Action? -Rotates scapula upward and laterally; protraction, depression -Stabilizes scapula
Serratus Anterior Synergists? Trapezius (Lat. Rotation); Pectoralis minor (protraction, stabilizer)
Serratus Anterior Nerve? Long Thoracic (C5,6,7)
Subclavius Origin? 1st rib at junction of costal cartilage
Subclavius Insertion? Subclavian groove on inferior surface of clavicle, between costoclavicular conoid ligaments
Subclavius Action? -Depresses clavicle; pulls it inferiorly and anteriorly -Assists SC ligaments with joint stability
Subclavius Nerve? Subclavian Nerve
Created by: rmart11