Shoulder Flashcards
deltoid orgin
lateral 1/3 of clavicle, acromion process, and spine of the scapula
deltoid insertion
deltoid tuberosity of the humerus
deltoid actions
abducts the shoulder (all fibers)
flexes, internally rotates, and horizontally adducts shoulder (anterior fibers)
pectoralis major orgin
medial clavicle
sternum
costal cartilages of ribs 1-7
pectoralis major insertion
lateral lip of the bicipital groove of the humerus
pectoralis major actions
flexes the shoulder (clavicular fibers)
extends the shoulder from overhead position (costal fibers)
coracobrachialis orgin
coracoid process of the scapula
coracobrachialis insertion
medial shaft, middle 1/3 of the humerus
coracobrachialis actions
flexes and adducts the shoulder
biceps brachaii orgin
long head: supraglenoid tubercle of the scapula
short head: coracoid process of the scapula
biceps brachaii insertion
radial tuberosity and bicipital aponeurosis overlying common flexor tendon
biceps brachaii actions
flexes, abducts (long head)
adducts (short head)
flexes and supinates the forearm
pectoralis minor orgin
ribs 3-5
pectoralis minor insertion
coracoid process of the scapula
pectoralis minor actions
protracts and depresses the scapula
elevates ribs 3-5
subclavius orgin
1st rib at the junction with the costocartilage
subclavius insertion
inferior surface of the middle 1/3 of the clavicle
subclavius actions
flexes the clavicle inferiorly or elevates the 1st rib
trapezius orgin
entire muscle: occiput, nuchal ligament and spinous process of C7-T12
upper fibers: external occipital protuberance, medial 1/3 of the superior nuchal line of the occiput, nuchal ligament and spinous process of C7
middle fibers: spinous processes of T1-T5
lower fibers: spinous processes of T6-T12
trapezius insertions
lateral 1/3 of the clavicle
acromion process
spine of the scapula
levator scapulae orgin
transver processes of C1-C4
levator scapulae insertion
superior angle of the scapula
levator scapulae actions
elevates and downwardly rotates the scapula
extends, laterally flexes, and rotates the neck to the same side (ipsilaterally)
trapezius actions
extends and laterally flexes the head and neck to the same side (ipsilaterally)
rotates the head and neck to the opposite side (contralaterally)
elevates and upwardly rotates the scapula (upper fibers)
retracts the scapula (entire muscle)
depresses and upwardly rotates the scapula (lower fibers)
rhomboid major and minor orgin
minor: spinous processes of C7-T1
major: spinous processes of T2-T5
rhomboid major and minor insertions
medial border of the scapula from the root of the spine to the inferior angle
rhomboid major and minor actions
retracts, elevates, and downwardly rotates the scapula
latissimus dorsi orgins
spinous processes of T7-L5
posterior iliac crest
posterior sacrum (via thoracolumbar aponeurosis)
latissimus dorsi insertions
medial lip of the bicipital groove of the humerus
latissimus dorsi actions
adducts the shoulder
horizontally abducts the shoulder
extends the shoulder
internally rotates the shoulder
teres major orgin
posterior surface of the inferior angle of the scapula
teres major insertion
medial lip of the bicipital groove on the humerus
teres major actions
adducts the shoulder
extends the shoulder
internally rotates the shoulder
serratus anterior orgin
later surfaces of upper 8 or 9 ribs
serratus anterior insertion
costal surface of medial border of the scapula
serratus anterior actions
protracts, depresses, and upwardly rotates the scapula
assists with forced inspiration when the insertion is fixed
supraspinatus orgin
supraspinous fossa of the scapula
supraspinatus insertion
greater tubercle of the humerus
supraspinatus actions
initiates abduction of the shoulder
infraspinatus orgin
infraspinous fossa of the scapula
infraspinatus insertion
greater tubercle of the humerus
infraspiantus actions
externally rotates, extends, and horizontally abducts the shoulder
teres minor orgin
upper 2/3 of the lateral border of the scapula
teres minor insertion
greater tubercle of the humerus
teres minor action
externally rotates, extends, adducts, and horizontally abducts the shoulder
subscapularis orgin
subscapular fossa of the scapula
subscapularis insertion
lesser tubercle of the humerus
subscapularis actions
internally rotates the shoulder
triceps brachaii orgin
long head: infraglenoid tubercle of the scapula
lateral head: proximal 1/2 of the posterior shaft of the humerus
media head: distal 1/2 of the posterior shaft of the humerus
triceps brachaii insertion
olecranon prcoess of the ulna
triceps brachaii actions
extends and adducts the shoulder (long head)
extends the elbow
