Muscle 1 (Origins, Insertions, Actions)

what are the four rotator cuff muscles?

Supraspinatus
Infraspinatus
Teres Minor
Subscapularis

Origin of Sternocleidomastoid

Manubrium of Sternum and Medial Clavicle

Insertion of Sternocleidomastoid

Mastoid Process

Action of Sternocleidomastoid

Lateral rotation of neck

Origin of Pectoralis Major

Sternum and sternal end of clavicle

Insertion of Pectoralis Major

Intertubercular groove of humerus

Action of Pectoralis Major

Medial rotation of humerus

Origin of trapezius

Occipital bone and spinous processes of C7-T12

Insertion of Trapezius

Lateral clavicle, lower acromian, and spine of scapula

Action of Trapezius

retraction of scapula

Origin of Deltoid

lateral clavicle

Insertion of Deltoid

Deltoid tuberosity of humerus

Action of Deltoid

Abduction of humerus

Origin of Latissimus Dorsi

Insertion of Latissimus Dorsi

Intertubercular groove of humerus

Action of Latissimus Dorsi

Adduction of humerus

Origin of Serratus Anterior

Outer anterior surface of upper 8 ribs

Insertion of Serratus Anterior

medial boarder of scapula

Action of Serratus Anterior

lateral upward rotation

Origin of Rhomboids

Spinous process C7-T5

Insertion of Rhomboids

medial border of scapula

Action of Rhomboids

retraction of scapula

Origin of Teres Major

inferior angle of scapula

Insertion of Teres Major

intertubercular groove of humerus

Action of Teres Major

adduction of humerus

origin of supraspinatus

supraspinous fossa of scapula

insertion of supraspinatus

greater tubercle of humerus 

action of supraspinatus

aids in abduction of humerus

Origin of infraspinatus

infraspinous fossa of scapula

insertion of infraspinatus

greater tubercle of humerus

action of infraspinatus

lateral rotation of humerus

orign of teres minor

lateral border of scapula

insertion of teres minor

greater tubercle of humerus

action of teres minor

lateral rotation of humerus

Origin of Subscapularis

subscapular fossa of scapula

Insertion of subscapularis

lesser tubercle of humerus

action of subscapularis

medial rotation of humerus

origin of biceps brachii

superglenoid tubercle and coracoid process of scapula

insertion of biceps brachii

radial tuberosity

action of biceps brachii

flexion of elbow

origin of triceps brachii

infraglenoid tubercle of scapula

insertion of triceps brachii

olecranon process of ulna

action of triceps brachii

extension of elbow

origin of brachioradialis

lateral supracondylar ridge of humerus

insertion of brachioradialis

styloid process of radius

action of brachioradialis

flexes elbow

origin of pronator teres

medial epicondyle of humerus

insertion of pronator teres

lateral shaft of radius

action of pronator teres

pronation of forearm