Shoulder Flashcards
Supraspinatus
O: supraspinus fossa of scapula
I: greater tubercle of humerus
A: abduction, stabilise ghj
Infraspinatus
O: infraspinous fossa of scapula
I: greater tubercle of humerus
A: lateral rotation, transverse abduction, stabilise ghj
Teres minor
O: posterior aspect of superior half of lateral border of scapula
I: greater tubercle of humerus
A: lateral rotation, transverse abduction, stabilise ghj
Subscapularis
O: subscauplar fossa of scapula
I: lesser tubercle of humerus
A: medial rotation, stabilise ghj
Subclavius
Very small muscle under clavicle
O: superior surface of costal end of first rib and adjacent first costal cartilage
I: inferior surface of the middle one third of clavicle
A: stabilise clavicle
Coracobrachialis
O: coracoid process of scapula
I: middle third of medial aspect of humerus
A: adduction, flexion at ghj
Teres major
O: posterior aspect of inferior angle of scapula
I: crest of lesser tubercle of humerus
A: adduction, medial rotation
Serratus anterior
O: external surface of first to ninth rib
I: medial border of scapula
A: protract and upwardly rotate pectoral girdle
Rhomboid minor
O: nuchal ligament and spinous processes of C7-T1
I: medial border of scapula, adjacent to spine of scapula
A: retraction and downward rotation of shoulder girdle
Rhomboid major
O: spinous processes of T2-T5
I: medial border of scapula, inferior to spine of scapula
A: Retraction and downward rotation of shoulder girdle
Levator scapulae
O: transverse processes of C1-C2, posterior tubercles of transverse processes of C3-C4
I: superior angle of scapula, medial border of scapula superior to spine of scapula
A: elevation and downward rotation of shoulder girdle, extension and lateral flexion of neck
Pec minor
O: anterior ends of third to fifth ribs
I: coracoid process of scapula
A: protraction and downward rotation of shoulder girdle
Pec major
O: clavicular head - anterior aspects of medial half of clavicle;
:sternocostal head - manubrium, sternal body, true ribs and their costal cartilages
:abdominal part - external abdominal oblique aponeurosis
I: crest of greater tubercle of humerus
A: adduction, medial rotation, transverse adduction, depression of shoulder girdle
Anterior deltoid (clavicular part of deltoid)
O: lateral one third of clavicle
I: deltoid tuberosity of humerus
A: flexion and medial rotation
Middle deltoid (acromial part of deltoid)
O: acromion of scapula
I: deltoid tuberosity of humerus
A: abduction
Posterior deltoid (scapular spinal part of deltoid)
O: spine of scapula
I: deltoid tuberosity of humerus
A: extension, lateral rotation, transverse abduction
Long head triceps brachii
O: infraglenoid tubercle of scapula
I: olecranon of ulna and adjacent antebrachial fascia
A: elbow extension
Lateral head of triceps brachii
O: posterior surface of humerus, superior to radial groove
I: olecranon of ulna and adjacent antebrachial fascia
A: elbow extension
Medial head of triceps brachii
O: posterior surface of humerus, inferior to radial groove
I: olecranon of ulna and adjacent antebrachial fascia
A: elbow extension
Long head of bicep brachii
O: supraglenoid tubercle of scapula
I: radial tuberosity and antebrachial fascia
A: forearm supination, elbow flexion (elbow flexion most effective when forearm is supinated)
Short head of biceps brachii
O: apex of coracoid process of scapula
I: radial tuberosity and antebrachial fascia
A: forearm supination, elbow flexion (elbow flexion most effective when forearm is supinated)
Ascending part of trapezius
O: spinous processes of T5-T12
I: medial end of spine of scapula
A: shoulder depression, retraction, upward rotation (acromioclavicular and sternoclavicular joints)
Transverse part of trapezius
O: spinous processes of C7-T4
I: acromion of scapula, lateral end of spine of scapula
A: shoulder retraction (acromioclavicular and sternoclavicular joints)
Descending part of trapezius
O: external occipital protuberance and superior nuchal line of occipital bone, nuchal ligament, spinous process of C7
I: posterior aspect of lateral 1/3 of clavicle, acromion of scapula
A: shoulder elevation, retraction, upward rotation (acromioclavicular and sternoclavicular joint), neck/head extension and lateral flexion
