Shoulder & Arm Flashcards
Deltoid
O: lateral third of clavicle, acromion, spine of scapula
I: deltiod tuberosity
A: abduct GH
Ant fibres: flex GH, int rotation GH, horizontal adduct GH
Post fibres: extend GH, ext rotation GH, horizontal abduct GH
N: axillary C5, C6
Trapezius
O: external occipital protuberance, medial portion of superior nuchal line of occiput, ligamentum nuchae, SPs of C7-T12
I: lateral third of clavicle, acromion, spine of scapula
A: upper fibres: bilaterally extend neck
Unilaterally: ipsilateral laterally flex neck, contralateral rotation neck, elevate scapula, upwardly rotate scapula
Middle fibres: adduct scapula, stabilize scapula
Lower fibres: depress scapula, upwardly rotate scapula
N: spinal portion of CNXI (accessory), ventral ramus C2, 3, 4
Latissimus Dorsi
O: inferior angle of scapula, SPs of last 6 thoracic vertebrae, last 3 or 4 ribs, thoracolumbar fascia, posterior iliac crest
I: intertubercular groove of humerus
A: extend GH, adduct GH, int rotation GH
N: thoracordorsal C6, 7, 8
Teres Major
O: inferior angle and lower third of lateral border of scapula
I: crest of lesser tubercle of humerus
A: extend GH, adduct GH, int rotation GH
N: lower subscapular C5, 6, 7
Supraspinatus
O: supraspinous fossa of scapula
I: greater tubercle of humerus
A: abduct GH, stabilize head of humerus in glenoid cavity
N: suprascapular C4, 5, 6
Infraspinatus
O: infraspinous fossa of scapula
I: greater tubercle of humerus
A: ext rotation GH, adduct GH, stabilize head of humerus in glenoid cavity
N: suprascapular C4, 5, 6
Teres Minor
O: upper two-thirds lateral border of scapula
I: greater tubercle of humerus
A: ext rotation GH, adduct GH, stabilize head of humerus in glenoid cavity
N: axillary C5, 6
Subscapularis
O: subscapular fossa of scapula
I: lesser tubercle of humerus
A: int rotation GH, stabilize head of humerus in glenoid cavity
N: upper and lower subscapular C5, 6, 7
Rhomboid Major
O: SPs of T2-T5
I: medial border of scapula btwn spine of scapula and inferior angle
A: adduct scapula, elevate scapula, downwardly rotate scapula
N: dorsal scapular C4, 5
Rhomboid Minor
O: SPs of C7 and T1
I: upper portion of medial border of scapula, across from spine of scapula
A: adduct scapula, elevate scapula, downwardly rotate scapula
N: dorsal scapular C4, 5
Levator Scapula
O: TVPs of C1-C4
I: medial border of scapula btwn superior angle and superior portion of spine of scapula
A: bilaterally extend neck
Unilaterally: elevate scapula, downwardly rotate scapula, laterally flex neck, ipsilateral rotate neck
N: cervical 3, 4, dorsal scapular C4, 5
Serratus Anterior
O: external surfaces of upper 8 or 9 ribs
I: anterior surface of medial border of scapula
A: orgin fixed: abduct scapula,m upwardly rotate scapula, depress scapula, hold medial border of scapula against rib cage
Scapula fixed: elevate thorax during forced inhalation
N: long thoracic C5, 6, 7, 8
Pectoralis Major
O: medial half of clavicle, sternum, cartilage of ribs 1-6
I: crest of greater tubercle of humerus
A: all fibres: adduct GH, int rotation GH, assist elevate thorax during forced inhalation (with arm fixed)
Upper fibres: flex GH, horizontal adduct GH
Lower fibres: extend GH
N: upper fibres: lateral pectoral C5, 6, 7
Lower fibres: lateral and medial pectoral C6, 7, 8, T1
Pectoralis Minor
O: ribs 3, 4, 5
I: medial surface of coracoid process of scapula
A: depress scapula, abduct scapula, downwardly rotate scapula, assist elevate thorax during forced inhalation (with scapula fixed)
N: medial pectoral with fibres from a communicating branch of lateral pectoral C(6), 7, 8, T1
Subclavius
O: first rib and cartilage
I: inferior surface of middle third of clavicle
A: depress clavicle and draw anteriorly, elevate first rib (assist inhalation), stabilize sternoclavicular joint
N: sunclavian C5, 6
Biceps Brachii
O: short head: coracoid process of scapula
Long head: supraglenoid tubercle of scapula
I: tuberosity of radius and aponeurosis of biceps brachii
A: flex elbow, supinate forearm, flex GH
N: musculocutaneous C5, 6
Triceps Brachii
O: long head: infraglenoid tubercle of scapula
Lateral head: posterior surface of proximal half of humerus
Medial head: posterior surface of distal half of humerus
I: olecranon process of ulna
A: ext elbow
Long head: ext GH, adduct GH
N: radial C6, 7, 8, T1
Coracobrachalis
O: corporate process of scapula
I: medial surface of mid-humeral shaft
A: flex GH, adduct GH
N: musculocutaneous C6, 7
