AOI and Innervation of the Upper and Lower Body

trapezius origin

occipital protuberance, nuchal ligament, spinous process of C7-T12

trapezius insertion

clavicle, acromion process, spine of scapula

trapezius action

extends and abducts head, rotates and adducts scapula, flexes scapula

latissimus dorsi origin

T7-12, L1-5, sacrum, iliac crest, ribs 10-12

latissimus dorsi insertion

intertubercular groove of humerus

latissimus dorsi action

extends, adducts, and medially rotates arm; depresses shoulder

deltoid origin

clavicle, acromion process, spine of scapula

deltoid insertion

deltoid tuberosity of humerus

deltoid action

abducts, flexes, and extends arm; medially and laterally rotates arm

deltoid innervation

axillary nerve

rhomboideus major origin

spines of T1-4

rhomboideus major insertion

inferior, medial border of scapula

rhomboideus major action

adducts scapula

rhomboideus major innervation

dorsal scapular nerve

rhomboideus minor origin

nuchal ligament, spines of C6-7

rhomboideus minor insertion

medial border of scapula at scapular spine

rhomboideus minor action

adducts scapula

rhomboideus minor innervation

dorsal scapular nerve

levator scapulae origin

C1-4

levator scapulae insertion

superior angle of scapula

levator scapulae action

elevates scapula, abducts and rotates neck

supraspinatus origin

supraspinous fossa

supraspinatus insertion

greater tubercle of humerus

supraspinatus action

abducts arm (stabilizes shoulder joint)

supraspinatus innveration

suprascapular nerve

infraspinatus origin

infraspinous fossa

infraspinatus insertion

greater tubercle of humerus

infraspinatus action

extends and laterally rotates arm (stabilizes shoulder joint)

infraspinatus innervation

suprascapular nerve

subscapularis origin

subscapular fossa

subscapularis insertion

lesser tubercle of humerus

subscapularis action

Extends and medially rotates arm (stabilizes shoulder joint)

subscapularis innervation

subscapular nerve

teres minor origin

lateral border of scapula

teres minor insertion

greater tubercle of humerus

teres minor action

extends, laterally rotates, and adducts arm (stabilizes shoulder joint)

teres minor innervation

axillary nerve

teres major origin

lateral border of scapula

teres major insertion

crest of lesser tubercle of humerus

teres major action

extends, adducts, and medially rotates arm

teres major innervation

subscapular nerve

triceps brachii origin

infraglenoid tubercle of scapula, lateral and posterior surface of humerus

triceps brachii insertion

olecranon process of ulna

triceps brachii action

extends and adducts arm, extends forearms

triceps brachii innervation

radial nerve

pectoralis major origin

clavicle, sternum, cartilages of ribs 1-7

pectoralis major insertion

crest of greater tubercle of humerus

pectoralis major action

flexes, adducts and medially rotates arm

pectoralis major innervation

anterior thoracic nerves

pectoralis minor origin

ribs 3-5

pectoralis minor insertion

coracoid process of scapula

pectoralis minor action

depresses glenoid cavity, raises ribs 3-5

pectoralis minor innervation

anterior thoracic nerves

biceps brachii origin

supraglenoid tubercle, coracoid process of scapula

biceps brachii insertion

radial tuberosity

biceps brachii action

flexes arm, flexes forearm, supinates hand

biceps brachii innervation

musculocutaneous nerve

coracobrachialis origin

coracoid process of scapula

coracobrachialis insertion

midmedial shaft of humerus

coracobrachialis action

flexes and adducts arm

coracobrachialis innervation

musculocutaneous nerve

brachialis origin

anterior, distal surface of humerus

brachialis insertion

coronoid process of ulna

brachialis action

flexes forearm

brachialis innervation

musculocutaneous and radial nerve

bradioradialis origin

lateral supracondylar ridge of humerus

bradioradialis insertion

styloid process of ulna

bradioradialis action

flexes forearm

bradioradialis innervation

radial nerve

supinator origin

lateral epicondyle of humerus, anterior ulna

supinator insertion

proximal radius

supinator action

supinates hand

supinator innervation

radial nerve

pronator teres origin

medial epicondyle of humerus, coronoid process of ulna

pronator teres insertion

lateral, middle shaft of radius

pronator teres action

pronates hand, flexes forearm

pronator teres innervation

median nerve

pronator quadratus origin

distal part of anterior ulna

pronator quadratus insertion

distal radius

pronator quadratus action

pronates hand

pronator quadratus innervation

median branch (anterior innterosseus branch)

palmaris longus origin

medial epicondyle of humerus

palmaris longus insertion

palmar fascia

palmaris longus action

flexes hand

palmaris longus innervation

median nerve

flexor carpi radialis origin

medial epicondyle of humerus

flexor carpi radialis insertion

metacarpals 2 and 3

flexor carpi radialis action

flexes and abducts hand

flexor carpi radialis innervation

median nerve

flexor carpi ulnaris origin

medial epicondyle of humerus and ulna

flexor carpi ulnaris insertion

pisiform, hamate, metacarpal 5

flexor carpi ulnaris action

flexes and adducts hand

flexor carpi ulnaris innervation

ulnar nerve

flexor digitorum superficialis origin

medial epicondyle of humerus, coronoid process of ulna, proximal radius

flexor digitorum superficialis insertion

middle phalanges of digits 2-5

flexor digitorum superficialis action

flexes proximal and middle phalanges 2-5, flexes hand

flexor digitorum superficialis innervation

median nerve

flexor digitorum profundus origin

ulna, interosseus membrane

flexor digitorum profundus insertion

distal phalanges of digits 2-5

flexor digitorum profundus action

flexes phalanges, flexes hand