Pectoral and Intrisic Muscles of the Shoulder Flashcards
Pectoralis major: origin
-clavicle -sternum -costal cartilages of superior ribs
Pectoralis major: insertion
anteromedial aspect of proximal humerus
Pectoralis major: innervation
-Medial pectoral nerve (C8, T1) -Lateral pectoral nerve (C5,C6, C7)
Pectoralis major: action
Glenohumeral joint: -Adduction -Flexion -Medial rotation
Pectoralis minor: origin
ribs 3-5
Pectoralis minor: insertion
Coracoid process of scapula
Pectoralis minor: innvervation
Medial pectoral nerve (C8, T1)
Pectoralis minor: action
Scapula: -Protraction -Depression -stabilization
Serratus Anterior: origin
lateral aspect of ribs 1-8
Serratus Anterior: insertion
Anterior surface of scapula medial border
Serratus Anterior: innervation
Long thoracic nerve (C5, C6, C7)
Serratus Anterior: action
Scapula: -protraction -Upward rotation -Fixes scapula to thoracic wall
Deltoid: origin
-clavicle -acromion -spine of the scapula
Deltoid: insertion
Deltoid tuberosity of humerus
Deltoid: innervation
axillary nerve (C5, C6)
Deltoid: action
anterior: flexion and medial rotation of Glenohumeral joint middle: abduction of glenohumeral joint after 15 degrees posterior: extension and lateral rotation of the glenohumeral joint
Teres major: origin
inferior angle of the scapula
Teres major: insertion
anteromedial aspect of proximal humerus
Teres major: innervation
Lower subscapular (C5, C6)
Teres major: action
Glenohumeral joint: -medial rotation -adduction
Teres minor: origin
lateral border of scapula
Teres minor: insertion
greater tubercle of humerus
Teres minor: innervation
Axillary (C5, C6)
Teres minor: action
Glenohumeral joint: -lateral rotation -stabilize the glenohumeral joint
