Shoulder and Arm MOINA

origin of pectoralis major

clavicle, sternum, upper 6 costal cartilages

insertion of pectoralis major

Lateral lip of bicipital groove of humerus

innervation of pectoralis major

medial and lateral pectoral nerves

action of pectoralis major

adducts arm and rotates it medially; clavicular fibers also flex arm

origin of pectoralis minor

ribs 3-5

insertion of pectoralis minor

coracoid process of scapula

innervation of pectoralis minor

medial pectoral nerve

action of pectoralis minor

depress point of shoulder; if scapula is fixed, it elevates ribs of origin

origin of subclavius

first costal cartilage

insertion of subclavius

clavicle

innervation of subclavius

nerve to subclavius from upper trunk of brachial plexus

action of subclavius

depress clavicle and steadies it during movements of shoulder girdle

origin of serratus anterior

upper 8 ribs

insertion of serratus anterior

medial border and inferior angle of scapula

innervation of serratus anterior

long thoracic nerve

action of serratus anterior

draws scapula forward around the thoracic wall; rotates scapula

origin of trapezius

Occipital bone; ligamentum nuchae; spines of C7 and all thoracic vertebrae

insertion of trapezius

upper fibers: lateral third of clavicle;

middle and lower fibers: acromion and spine of scapula

innervation of trapezius

spinal part of accessory nerve (motor) and C3 and C4 (sensory)

action of trapezius

upper fibers: elevate scapula;

middle fibers: pull scapula medially;

lower fibers: pull medial border of scapula downward

origin of latissimus dorsi

illiac crest, lumbar fascia, spines of lower 6 thoracic vertebrae, lower 3-4 ribs, inferior angle of scapula

insertion of latissimus dorsi

Floor of bicipital groove of humerus

innervation of latissimus dorsi

thoracodorsal nerve

action of latissimus dorsi

extends, adducts, and medially rotates arm

origin of levator scapulae

transverse processes of C1-C4

insertion of levator scapulae

medial border of scapula

innervation of levator scapulae

C3 to C4 and dorsal scapular nerve

action of levator scapulae

raises medial border of scapula

origin of rhomboid minor

Ligamentum nuchae and spinous processes C7-T1

insertion of rhomboid minor

medial border of scapula

Innervation of rhomboid minor

dorsal scapular nerve

action of rhomboid minor

raises medial border of scapula upward and medially

origin of rhomboid major

2nd to 5th thoracic spines

insertion of rhomboid major

medial border of scapula

innervation of rhomboid major

dorsal scapular nerve

action of rhomboid major

raises medial border of scapula upward and medially

origin of deltoid

Lateral third of clavicle, acromion and spine of scapula

insertion of deltoid

Middle of lateral surface of humerus (deltoid tuberosity)

innervation of deltoid

axillary nerve

action of deltoid

abducts arm; anterior fibers flex & medially rotate the arm; posterior fibers extend & laterally rotate the arm

origin of supraspinatus

supraspinous fossa of scapula

insertion of supraspinatus

Greater tuberosity of humerus; capsule of shoulder joint

innervation of supraspinatus

suprascapular nerve

action of supraspinatus

abducts arm and stabilizes shoulder joint

origin of infraspinatus

infraspinous fossa of scapula

insertion of infraspinatus

Greater tuberosity of humerus; capsule of shoulder joint

innervation of infraspinatus

suprascapular nerve

action of infraspinatus

laterally rotates arm and stabilizes shoulder joint

origin of teres major

lower third of lateral border of scapula

insertion of teres major

medial lip of bicipital groove of humerus

innervation of teres major

lower subscapular nerve

action of teres major

medially rotates arm and adducts arm and stabilizes shoulder joint

origin of teres minor

upper 2/3 of lateral border of scapula

insertion of teres minor

Greater tuberosity of humerus; capsule of shoulder joint

innervation of teres minor

axillary nerve

action of teres minor

laterally rotates arm and stabilizes shoulder joint

origin of biceps brachii

long head: supraglenoid tubercle of scapula;

short head: coracoid process of scapula

insertion of biceps brachii

tuberosity of radius and bicipital aponeurosis into deep fascia of forearm

innervation of biceps brachii

musculocutaneous nerve

action of biceps brachii

supinator of forearm and flexor of elbow joint; weak flexor of shoulder joint

origin of coracobrachialis

coracoid process of scapula

insertion of coracobrachialis

medial aspect of shaft of humerus

innervation of coracobrachialis

musculocutaneous nerve

action of coracobrachialis

flexes arm and weak adductor

origin of brachialis

front of lower half of humerus

insertion of brachialis

coronoid process of ulna

innervation of brachialis

musculocutaneous nerve

action of brachialis

flexor of elbow joint

origin of triceps brachii

Long head: infraglenoid tubercle of scapula

Lateral head: upper half of posterior surface of shaft of humerus

Medial head: lower half of posterior surface of shaft of humerus

insertion of triceps brachii

olecranon process of ulna

innervation of triceps brachii

radial nerve

action of triceps brachii

extensor of elbow joint