Shoulder Myology Flashcards
pectoralis major origin
medial half of clavicle, anterior sternum, superior 6 costals
pectoralis major insertion
lateral lip of intertubercular groove
pectoralis major action
horizontal adduction, medial rotation
pectoralis major nerve
medial and lateral pectoral nerve
pectoralis minor origin
ribs 3-5
pectoralis minor insertion
coracoid process
pectoralis minor action
scapular protraction and depression
pectoralis minor nerve
medial pectoral nerve
subclavius origin
junction of first rib and costal cartilage
subclavius insertion
inferior surface of clavicle
subclavius action
anchors and depresses clavicle
subclavius nerve
nerve to subclavius
serratus anterior origin
external surface of lateral ribs 1-8
serratus anterior insertion
anterior surface of medial border of scapula
serratus anterior action
scapular protraction, prevents scapular winging
serratus anterior nerve
long thoracic nerve
trapezius origin
external occipital protuberance, spinous processes C7-T12
trapezius insertion
distal clavicle, AC joint, spine of scapula
upper trapezius action
elevates and upwardly rotates scapula
middle trapezius action
retracts scapula
lower trapezius action
depresses and upwardly rotates scapula
trapezius nerve
CN 11 (spinal accessory nerve)
latissimus dorsi origin
spinous processes T6-T12, iliac crest, thoracolumbar fascia
latissimus dorsi insertion
floor of intertubercular groove
latissimus dorsi action
extension, adduction, internal rotation
latissimus dorsi nerve
thoracodorsal nerve
levator scapulae origin
transverse processes of C1-C4
levator scapulae insertion
superior part of medial border of scapula
levator scapulae action
elevates and downwardly rotates scapula
levator scapulae nerve
dorsal scapular nerve
rhomboid major origin
T2-T5 spinous processes
rhomboid minor origin
C7-T1 spinous processes
rhomboids insertion
medial border of scapula below spine
rhomboids action
scapular retraction, downward rotation
rhomboids nerve
dorsal scapular nerve
deltoid origin
distal clavicle, AC joint, spine of the scapula
deltoid insertion
deltoid tuberosity
deltoid action
abduction of shoulder
deltoid nerve
axillary nerve
teres major origin
dorsal surface of inferior angle of scapula
teres major insertion
medial lip of intertubercular groove
teres major action
internal rotation and adduction
teres major nerve
lower subscapular nerve
rotator cuff muscles
supraspinatus, infraspinatus, teres minor, subscapularis
supraspinatus origin
supraspinous fossa
supraspinatus insertion
superior facet of greater tuberosity
supraspinatus action
abduction of shoulder in first 15 deg., compresses glenohumeral joint
supraspinatus nerve
suprascapular nerve
infraspinatus origin
infraspinous fossa
infraspinatus insertion
middle facet of greater tuberosity
infraspinatus action
external rotation of shoulder
infraspinatus nerve
suprascapular nerve
teres minor origin
superior part of lateral scapular border
teres minor insertion
inferior facet of greater tuberosity
teres minor action
external rotation of shoulder
teres minor nerve
axillary nerve
subscapularis origin
subscapular fossa
subscapularis insertion
lesser tuberosity
subscapularis action
internal rotation of shoulder
subscapularis nerve
upper and lower subscapular nerves
coracobrachialis origin
coracoid process
coracobrachialis insertion
middle 1/3 of medial humerus
coracobrachialis action
shoulder flexion, adduction
coracobrachialis nerve
musculocutaneous nerve
biceps brachii origin
long head: supraglenoid tubercle
short head: coracoid process
biceps brachii insertion
radial tuberosity and bicipital aponeurosis
biceps brachii action
elbow and shoulder flexion
biceps brachii nerve
musculocutaneous nerve
triceps brachii origin
long head: infraglenoid tubercle
lateral and medial heads: shaft of humerus
triceps brachii insertion
olecranon process
triceps brachii action
elbow extension, shoulder extension and adduction
triceps brachii nerve
radial nerve
