Origins, Insertion, Action for Muscle

what is the origin, insertion, and action for the sternocleidomastoid?

Origin: manubrium of sternum and medial clavicle.

Insertion: mastoid process

Action: flexion of neck, lateral rotation of neck

what is the origin, insertion, and action for the petoralis major?

Origin: sternum and medial half(sternal end) of clavicle

Insertion: intertubercular groove of the humerus

Action: flexion, adduction, and medial rotation of humerus

what is the origin, insertion, and action for the trapezius?

Origin: occipital and spinous process of C7-T12

Insertion: lateral clavicle, lower acromion, and spine of scapula

Action: lateral rotation, elevation, depression, retraction of scapula.

what is the origin, insertion, and action for the deltoid?

Origin: acromion and spine of scapula; lateral clavicle

Insertion: deltoid tuberosity of humerus

Action: abduction of humerus; aids flexion, extension, rotation of arm

What is the origin, insertion, and action of the latissimus dorsi?

Origin: aponeurosis from T7 to posterior 3rd of iliac crest.

Insertion: intertubercular groove of humerus

Action: extension, adduction, medial rotation of humerus

What is the origin, insertion, and action of the serratus anterior?

Origin: outer anterior surface of upper 8 ribs

Insertion: medial (vertebral) border of scapula

Action: lateral upward rotation, protraction of scapula, stabilizes scapula against chest

What is the origin, insertion, and action of the rhomboids?

Origin: spinous process C7-T5

Insertion: vertebral border of scapula

Action: retraction, downward rotation of scapula

What is the origin, insertion, and action of the teres major?

Origin: inferior angle of scapula

Insertion: intertubercular groove of humerus

Action: medial rotation, adduction of humerus

What is the origin, insertion, and action of the supraspinatus?

Origin: supraspinous fossa of scapula

Insertion: greater tubercle of humerus

Action: aids in abduction of humerus, stabilizes shoulder joint

What is the origin, insertion, and action of the infraspinatus?

Origin: infraspinous fossa of scapula

Insertion: greater tubercle of humerus

Action: lateral rotation of humerus; stabilizes shoulder joint

What is the origin, insertion, and action of the subscapularis?

Origin: subscapular fossa of scapula

Insertion: lesser tubercle of humerus

Action: medial rotation of humerus; stabilizes shoulder joint

What is the origin, insertion, and action of the biceps brachii

Origin:

long head: supraglenoid tubercle of scapula

short head: coracoid process of scapula

Insertion: radial tuberosity

Action: flexion of elbow and supination of forearm

What is the origin, insertion, and action of the triceps brachii

Origin:

Long head: infraglenoid tubercle of scapula

Lateral head: upper posterior humerus

Medial head: lower posterior humerus

Insertion: olecranon process of ulna

Action: extension of elbow, aids in adduction of humerus, Long head: stabilizes shoulder joint; extension of humerus

What is the origin, insertion, and action of the brachioradialis?

Origin: upper, lateral supracondylar ridge of humerus

Insertion: styloid process of radius

Action: flexes elbow

What is the origin, insertion, and action of the pronator teres?

Origin: medial epicondyle of humerus coronoid process of ulna

Insertion: lateral shaft of radius

Action: pronation of forearm; flexes elbow