Muscles Of The Upper Extremities - Origin

Front 1

Upper Trapezius

Back 1

External occipital protuberance and Ligamentum nuchae

Front 2

Middle Trapezius

Back 2

C7 - T3 spinous processes

Front 3

Lower Trapezius

Back 3

T4 - T12 spinous processes

Front 4

Levator Scapula

Back 4

C1 - C4 transverse processes

Front 5

Rhomboid Minor

Back 5

C7 - T1 spinous processes

Front 6

Rhomboid Major

Back 6

T2 - T5 spinous processes

Front 7

Serratus Anterior

Back 7

Lateral surface of upper 8 ribs

Front 8

Subclavius

Back 8

1st rib: costocartilage junction

Front 9

Pectoralis Minor

Back 9

Anterior surface of ribs 3 - 5 near costal cartilages

Front 10

Pectoralis Major

Back 10

Clavicular Head: Medial half of clavicle

Sternocostal Head: Sternum, Cartilages of upper 6 ribs, and Aponeurosis of the External Oblique

Front 11

Latissimus Dorsi

Back 11

Thoracolumbar aponeurosis, Lower 6 thoracic spinous processes, Sacrum, Iliac crest of Ilium, Lower 3 to 4 ribs, and Inferior angle of scapula

Front 12

Supraspinatus

Back 12

Supraspinous fossa of scapula

Front 13

Infraspinatus

Back 13

Infraspinous fossa of scapula

Front 14

Teres Minor

Back 14

Upper 2/3 of axillary border of scapula

Front 15

Subscapularis

Back 15

Subscapular fossa of scapula

Front 16

Teres Major

Back 16

Inferior angle of scapula: dorsal surface and Lower third of axillary border of scapula

Front 17

Anterior Deltoid

Back 17

Lateral third of clavicle

Front 18

Middle Deltoid

Back 18

Acromion of scapula: lateral surface

Front 19

Posterior Deltoid

Back 19

Spine of scapula

Front 20

Coracobrachialis

Back 20

Coracoid process of scapula

Front 21

Biceps Brachii

Back 21

Short Head: Coracoid process of scapula

Long Head: Supraglenoid tubercle of scapula

Front 22

Brachialis

Back 22

Lower half of anterior shaft of Humerus

Front 23

Triceps Brachii

Back 23

Long Head: Infraglenoid tubercle of scapula

Lateral Head: Posterior Humerus above spiral groove

Medial Head: Posterior Humerus below spiral groove

Front 24

Anconeus

Back 24

Lateral epicondyle of Humerus

Front 25

Flexor Carpi Radialis

Back 25

Medial epicondyle of Humerus (common flexor tendon)

Front 26

Flexor Carpi Ulnaris

Back 26

Humeral Head: Medial epicondyle of Humerus (common flexor tendon)

Ulnar Head: Proximal posterior Ulna and Olecranon process of Ulna

Front 27

Palmaris Longus

Back 27

Medial epicondyle of Humerus (common flexor tendon)

Front 28

Pronator Teres

Back 28

Humeral Head: Medial epicondyle of Humerus

Ulnar Head: Coronoid process of Ulna

Front 29

Pronator Quadratus

Back 29

Distal fourth of anterior Ulna

Front 30

Flexor Digitorum Superficialis

Back 30

Humeroulnar Head: Medial epicondyle of Humerus (common flexor tendon) and Coronoid process of Ulna

Radial Head: Anterior oblique line of Radius

Front 31

Flexor Digitorum Profundus

Back 31

Proximal 3/4 of anterior ulna and Interosseous membrane

Front 32

Flexor Pollicus Longus

Back 32

Middle of anterior radius and Interosseous membrane

Front 33

Brachioradialis

Back 33

Lateral supracondylar ridge of Humerus

Front 34

Extensor Carpi Radialis Longus

Back 34

Lateral supracondylar ridge of Humerus and Lateral epicondyle of Humerus

Front 35

Extensor Carpi Radialis Brevis

Back 35

Lateral epicondyle of Humerus (common extensor tendon)

Front 36

Extensor Carpi Ulnaris

Back 36

Humeral Head: Lateral epicondyle of Humerus (common extensor tendon)

Ulnar Head: (Deep to Humeral Head) Posterior proximal ulna - subcutaneous border

Front 37

Extensor Digitorum

Back 37

Lateral epicondyle of Humerus (common extensor tendon)

Front 38

Extensor Digiti Minimi

Back 38

Lateral epicondyle of Humerus (common extensor tendon)

Front 39

Supinator

Back 39

Lateral epicondyle of Humerus, Annular ligament of Radius, Radial collateral ligament, and Proximal Ulna at supinator crest

Front 40

Extensor Indicis

Back 40

Posterior Ulna

Front 41

Abductor Pollicis Longus

Back 41

Posterior Radius, Posterior Ulna, and Interosseous membrane

Front 42

Extensor Pollicis Longus

Back 42

Posterior Ulna: Middle 1/3

Front 43

Extensor Pollicis Brevis

Back 43

Posterior Radius and Interosseous membrane

Front 44

Abductor Pollicis Brevis

Back 44

Flexor retinaculum, Trapezium carpal bone, and Scaphoid carpal bone

Front 45

Flexor Pollicis Brevis

Back 45

Superficial Head: Flexor retinaculum and Trapezium carpal bone

Deep Head: Trapezoid carpal bone and Capitate carpal bone

Front 46

Opponens Pollicis

Back 46

Flexor retinaculum and Trapezium carpal bone

Front 47

Adductor Pollicis

Back 47

Transverse Head: Anterior shaft of 3rd metacarpal

Oblique Head: Base of 2nd and 3rd metacarpals; and the Capitate, Trapezoid, and Trapezium carpal bones

Front 48

Flexor Digiti Minimi Brevis

Back 48

Flexor retinaculum and Hook of Hamate carpal bone

Front 49

Opponens Digiti Minimi

Back 49

Flexor retinaculum and Hook of Hamate carpal bone

Front 50

Abductor Digiti Minimi

Back 50

Pisiform carpal bone

Front 51

Lumbricals

Back 51

Flexor Digitorum Profundus tendons

Front 52

Palmar Interossei

Back 52

Shaft of 2nd, 3rd, and 5th metacarpals - palmar surface

Front 53

Dorsal Interossei

Back 53

Each has 2 heads arising from adjacent dorsal surfaces of metacarpals