Shoulder Muscles Flashcards
Rhomboid minor
O: spinous processes C7-T1
I: medial border of scapula
A: (scapula) adduction, downward rotation, and elevation
Rhomboid major
O: spinous processes T2-T5
I: medial border of scapula
A: (scapula) adduction, downward rotation, and elevation
Levator scapulae
O: transverse processes of C1-C4
I: medial border of scapula
A: (scapula) elevation and downward rotation
Serratus anterior
O: ribs 1-9
I: medial border of scapula
A: (scapula) depression, abduction and upward rotation. (ribs) elevation
Pectoralis minor
O: ribs 3-5
I: coracoid process
A: (scapula) depression, downward rotation, and abduction (ribs) elevation
Trapezius
O: occipital bone, spinous processes of C7-T12
I: lateral 1/3 of clavicle, acromion, and scapula spine
A: (scapula) elevation, adduction, depression and upward rotation
Supraspinatus
O: supraspinatus fossa
I: the greater tubercle of the humerus
A:(deltoid) abduction, (GH joint) stabilization
Infraspinatus
O: infraspinatus fossa
I: greater tubercle of the humerus
A: (shoulder) external rotation, abduction, and horizontal abduction (GH joint) stabilization
Teres minor
O: lateral border of scapula
I: greater tubercle of humerus
A: (shoulder) external rotation and horizontal abduction (GH joint) stabilization
Subscapularis
O: subscapular fossa
I: lesser tubercle of humerus
A: (humerus head) internal rotation
Anterior Deltoid
O: lateral 1/3 of clavicle
I: deltoid tuberosity
A: (shoulder) flexion, horizontal adduction, and internal rotation
Middle Deltoid
O: acromion
I: deltoid tuberosity
A: (shouder) abduction
Posterior Deltoid
O: scauplar spine
I: deltoid tuberosity
A: (shoulder) extension, horizontal abduction, and external rotation
Pectoralis major
O: distal sternum
I: intertubercular groove
A: (shoulder) adduction and internal rotation
Latissimus dorsi
O: spinous processes of T7-T12, L1-L5, and sacrum
I: intertubercular groove
A: (shoulder) extension, adduction, and internal rotation (scapula) downward rotation, depression, adduction (spine) lateral flexion
Triceps brachii lateral head
O: posterior surface of humerus
I: olecranon
A: (forearm) extension
Triceps brachii long head
O: infraglenoid tuberosity
I: olecranon
A: (forearm) extension (shoulder) extension and adduction
Triceps brachii medial head
O: posterior surface of humerus
I: olecranon
A: (forearm) extension
Coracobrachialis
O: coracoid process
I: medial surface of humerus
A: (shoulder) flexion, adduction, and horizontal adduction
Biceps brachii short head
O: coracoid process
I: radial tuberosity
A: (elbow) flexion and supination (shoulder) flexion
Biceps brachii long head
O: supraglenoid tubercle
I: radial tuberosity
A: (elbow) flexion and supination (shoulder) flexion
