UPPER BODY MUSCLES

trapezius origin

nuchal line, occipital protuberance, ligamentum nuchae, spinous processes of CVIII to TXII

trapezius insertion

lateral 1/3 of clavicle, acromion, spine of scapula

trapezius main actions

assists in rotating scapula during abduction of humerus above horizontal

trapezius motor innervation

accessory nerve (XI)

latissimus dorsi origin

spinous processes of TVII to LV and sacrum, iliac crest, ribs X to XII

latissimus dorsi insertion

intertubercular sulcus of humerus

latissimus dorsi innervation

thoracodorsal nerve

latissimus dorsi main actions

extends, adducts, medially rotates humerus

levator scapulae origin

transverse process of CI to CIV

levator scapulae insertion

medial border of scapula

levator scapulae innervation

dorsal scapular nerve

levator scapulae main actions

elevates scapula

anterior scalene origin

transverse processes of CIII to CVI

anterior scalene insertion

scalene tubercle and rib 1

anterior scalene innervation

anterior rami of CI to CIII

anterior scalene main actions

elevates rib 1

rhomboids origin

ligamentum nuchae, spinous processes of CVII to TV

rhomboids insertion

medial border of scapula at spine

rhomboids innervation

dorsal scapular nerve

rhomboids main actions

retracts (aDducts) and elevates scapula

deltoid origin

spine of scapula, acromion, lateral 1/3 of clavicle

deltoid insertion

deltoid tuberosity of humerus

deltoid innervation

axillary nerve

deltoid main actions

abductor of arm

pectoralis major origin

clavicle, sternum, costal cartilages (first 7), 6th rib

pectoralis major insertion

intertubercular sulcus of humerus

pectoralis major innervation

medial and lateral pectoral nerves

pectoralis major main actions

flexion, aDduction, medial rotation of arm at glenohumeral jt, flexion/extension of flexed arm

pectoralis minor origin

ribs III to V, intercostal spaces

pectoralis minor insertion

coracoid process of scapula

pectoralis minor innervation

medial pectoral nerves

pectoralis minor main actions

pulls tip of shoulder down; protracts scapula

serratus anterior origin

8-9 ribs

serratus anterior insertion

medial border of scapula

serratus anterior innervation

long thoracic nerve

serratus anterior main actions

protraction and rotation of the scapula

supraspinatus origin

supraspinous fossa of the scapula

supraspinatus insertion

greater tubercle of humerus

supraspinatus innervation

suprascapular nerve

supraspinatus main actions

aBduction of the glenohumeral jt (rotator cuff muscle)

infraspinatus origin

infraspinous fossa of scapula

infraspinatus insertion

greater tubercle of humerus

infraspinatus innervation

suprascapular nerve

infraspinatus main actions

lateral rotation of arm at glenohumeral jt (rotator cuff muscle)

teres minor origin

upper 2/3 of flattened strip of bone on the posterior surface of scapula

teres minor insertion

greater tubercle of humerus

teres minor innervation

axillary nerve

teres minor main actions

lateral rotation of arm at the glenohumeral jt (rotator cuff muscle)

subscapularis origin

subscapular fossa

subscapularis insertion

lesser tubercle of humerus

subscapularis innervation

upper and lower scapular nerve

subscapularis main actions

medial rotation of arm at glenohumeral jt (rotator cuff mm)

teres major origin

oval area of scapula

teres major insertion

intertubercular sulcus of humerus

teres major innervation

lower subscapular nerve

teres major main actions

medial rotation and extension of arm at glenohumeral jt

biceps brachii long head origin

supraglenoid tubercle of scapula

biceps brachii short head origin

apex of coracoid process

biceps brachii insertion

radial tuberosity

biceps brachii innervation

musculocutaneous nerve

biceps brachii main actions

flexor of the forearm at elbow jt, supinator of forearm

coracobrachialis origin

apex of coracoid process

coracobrachialis insertion

mid-shaft of humerus

coracobrachialis innervation

musculocutaneous nerve

coracobrachialis main actions

flexor of the arm at glenohumeral jt, aDducts arm

brachialis origin

anterior aspect of humerus

brachialis insertion

tuberosity of ulna

brachialis innervation

musculocutaneous nerve

brachialis main actions

flexor of forearm at elbow jt

brachioradialis origin

lateral supraepicondylar ridge of humerus

brachioradialis insertion

distal end of radius

brachioradialis innervation

radial nerve

brachioradialis main actions

accessory flexor of elbow jt when forearm is mid-pronated

triceps brachii long head origin

infraglenoid tubercle on scapula

triceps brachii medial head origin

posterior surface of humerus

triceps brachii lateral head origin

posterior surface of humerus

triceps brachii insertion

olecranon process of ulna

triceps brachii innervation

radial nerve

triceps brachii main actions

extension of forearm at the elbow jt

pronator quadratus origin

linear ridge of ulna

pronator quadratus insertion

distal anterior surface of radius

pronator quadratus innervation

median nerve

pronator quadratus main actions

pronation

pronator teres origin

humeral head and ulnar head

pronator teres insertion

mid-shaft of radius

pronator teres innervation

median nerve

pronator teres main actions

pronation

supinator origin

lateral epicondyle of humerus, supinator crest of ulna

supinator insertion

lateral surface of radius

supinator innervation

posterior interosseous nerve

supinator main actions

supination

flexors of hand and wrist origin

medial epicondyle of humerus

flexors of hand and wrist insertion

metacarpals, phalanges, palmar aponeurosis

extensors of hand and wrist origin

lateral epicondyles of humerus

extensors of hand and wrist insertion

metacarpals and phalanges

flexors of hand and wrist action

flexion

flexors of hand and wrist innervation

median and ulnar nerve

extensors of hand and wrist innervation

radial nerve

extensors of hand and wrist action

extension