Upper Extremity Attachments

Latissimus Dorsi

O: Lower thoracic spinous processes, thoracolumbar fascia, and iliac crest

I: Floor of the intertubercular sulcus of humerus

Levator Scapulae

O: Transverse processes of C1-C4

I: Superior angle and superomedial border of scapula

Pectoralis Major

O: Clavicle, costal cartilages, sternum, and aponeurosis of the external oblique
I: Lateral lip of the intertubercular sulcus of the humerus

Pectoralis Minor

O: Outer surfaces of ribs 3-5
I: Coracoid process

Rhomboids

O (major): Spinous processes T2-T5

O (minor): Ligamentum nuchae and spinous processes C7-T1

I (both): medial border of scapula

Serratus Anterior

O: Outer surfaces and superior borders of upper 8-10 ribs
I: Costal surface of the medial border of scapula

Subsclavius

O: 1st rib and cartilage
I: Undersurface of the clavicle

Trapezius

O: Superior nuchal line, external occipital protuberance, ligamentum nuchae, and C&T spinous processes
I: Clavicle, acromion, and scapular spine

Deltoid

O: Clavicle, acromion, and spine of scapula

I: Deltoid tuberosity of humerus

Supraspinatus

O: Medial 2/3 of the supraspinous fossa

I: Superior facet of greater tubercle of humerus and shoulder joint capsule

Infraspinatus

O: Medial 2/3 of the infraspinous fossa

I: Shoulder joint capsule

Teres Minor

O: Upper 2/3 of the dorsal surface of the lateral border of the scapula
I: Inferior facet of the greater tubercle of the humerus and to shoulder joint capsule

Subscapularis

O: Subscapular fossa

I: Lesser tubercle of the humerusT

Teres Major

O: Dorsal surface of the inferior angle scapula and lower 1/3 of the lateral border of the scapula

I: Medial lip of the intertubercular sulcus of humerus

Anconeus

O: Lateral epicondyle of humerus

I: Lateral surface of the olecranon process

Biceps Brachii

O: Coracoid process (short head) and supraglenoid tubercle (long head) of the scapula

I: Radial tuberosity and the deep antebrachial fascia (through the biciptal aponeurosis)

Brachialis

O: Distal anterior shaft of humerus

I: Lateral and medial intermuscular septa to the coronoid process and ulnar tuberosity

Coracobrachialis

O: Coracoid process

I: Proximal medial shaft of the humerus

Triceps Brachii

O: infraglenoid tubercle of scapula (long head), proximal posterolateral (lateral head), and distal posteromedial (medial) shaft of humerus

I: Olecranon process of ulna

Abductor Pollicis Longus

O: Proximal posterior radius, ulna, and interosseous membrane

I: Base of 1st metacarpal and trapezium

Brachioradialis

O: Lateral supracondylar ridge of humerus

I: Distal radius lateral to the styloid process

Extensor Carpi Radialis Brevis

O: Lateral Epicondyle of humerus (common extensor origin)

I: Base of 3rd metacarpal

Extensor Carpi Radialis Longus

O: Lateral supracondylar ridge of humerus

I: Base of the 2nd metacarpal

Extensor Carpi Ulnaris

O: Lateral epicondyle of humerus (common extensor origin)

I: Base of 5th metacarpal

Extensor Digitorum

O: Lateral epicondyle of the humerus (common extensor origin)

I: Extensor expansions of digits 2-5

Extensor Digiti Minimi

O: Lateral epicondyle of humerus (common extensor origin)

I: DigitalE expansion of the 5th digit

Extensor Indicis

O: Posterior surface of the ulna and interosseous membrane

I: Digital expansion of the 2nd digit

Extensor Pollicis Brevis

O: Posterior radial surface and interosseous membrane

I: Base of the 1st proximal phalanx

Extensor Pollicis Longus

O: Middle 1/3 of the posterior surface of ulna and interosseous membrane

I: Base of the 1st distal phalanx

Flexor Carpi Radialis

O: Medial epicondyle (common flexor origin)

I: Palmar aspect of the base of the 2nd metacarpal

Flexor Carpi Ulnaris

O: Medial epicondyle (common flexor origin) of humerus and proximal ulnar shaft

I: pisiform

Flexor Digitorum Profundus

O: Anterior proximal 2/3 of ulna and interosseous membrane

I: Base of distal phalanges of digits 2-5

Flexor Digitorum Superficialis

O: Medial epicondyle (common flexor origin) of humerus

I: Sides of the middle phalanges of digits 2-5

Flexor Pollicis Longus

O: Anterior surface of the radius and interosseous membrane

I: Base of the distal phalanx of the thumb

Palmaris Longus

O: Medial epicondyle of humerus (common flexor origin)

I: Palmar aponeurosis

Pronator Quadratus

O: Anterior surface of the distal ulna

I: Anterior surface of the distal radius

Pronator Teres

O: Medial epicondyle and ulnar coronoid process

I: Lateral aspect of the radius

Supinator

O: Lateral epicondyle of humerus, radial collateral ligament, and supinator crest of ulna

I: Lateral surface of proximal radius

Abductor Digiti Minimi

O: Pisiform

I: Ulnar side of the base of proximal phalanx of 5th digit

Abductor Pollicis Brevis

O: Transverse carpal ligament

I: Radial side of the base of the proximal phalanx of thumb and tubercle of trapezium

Adductor Pollicis

O: Capitate, 2nd & 3rd metacarpals (oblique head), and palmar aspect of 3rd metacarpal (transverse head)

I: Base of proximal phalanx of thumb

Dorsal Interossei

O: Adjacent sides of the metacarpals

I: Proximal phalangeal bases and dorsal digital expansions of digits 2-4

Flexor Digiti Minimi Brevis

O: Hamate

I: Ulnar side of the base of the proximal phalanx of 5th digit

Flexor Pollicis Brevis

O: Transverse carpal ligament and trapezium

I: Radial side of base of the proximal phalanx of the thumb (deep head blends with opponens pollicis)

Lubricals

O: Tendons of the flexor digitorum profundus

I: Radial side of the dorsal digital expansions of digits 2-5

Opponens Digiti Minimi

O: Hook of hamate

I: Ulnar margin of shaft of 5th metacarpal

Opponens Pollicis

O: Transverse carpal ligament and trapezium

I: Palmar surface of the 1st metacarpal

Palmar Interossei

O: Palmar aspect of metacarpals 2, 4, & 5

I: Dorsal digital expansions of digits 2, 4, & 5