OP Hands Fieldwork 2025

Review for outpatient hand therapy placement

Deltoid (Ant, Middle, Post)

Mnemonic: 'Deltoid helps you carry SACS

O: Lateral 1/3 of Clavicle (clavicular part), Acromion, Spine of Scapula 
Mnemonic: 'Deltoid helps you carry SACS
I: Deltoid Tuberosity

Inn: Axillary nerve (C5, C6)

A: Flexion, Extension, Abduction of the shoulder

Teres Major

O: Inferior angle of the Scapula

I: Intertubercular Sulcus of Humerus

Inn: Lower Subscapular Nerve (C5-C7)

A: Extension, Adduction, and Internal Rotation of Shoulder

Supraspinatus (Rotator Cuff)

O: Supraspinous fossa of scapula

I: Greater Tubercle of Humerus

Inn: Suprascapular Nerve (C5, C6)

A: Abduction of the shoulder and stabilization of the shoulder joint.

Infraspinatus (Rotator Cuff)

O: Infraspinous fossa of scapula

I: Greater Tubercle of Humerus

Inn: Suprascapular Nerve (C5, C6)

A: External rotation of the shoulder and stabilization of the shoulder joint.

Teres Minor (Rotator Cuff)

O: Lateral Border of Scapula

I: Greater Tubercle of Humerus

Inn: Axillary Nerve (C5, C6)

A: External Rotation, Adduction, and stabilization of the shoulder joint.

Subscapularis (Rotator Cuff)

O: Subscapular Fossa of Scapula

I: Lesser Tubercle of Humerus

A: Internal rotation and stabilization of shoulder joint

Inn: Upper and Lower Subscapular Nerve (C5, C6)

Biceps Brachii

O: Short head - Apex of the Coracoid process of the scapula
Long head - Supraglenoid tubercle of the scapula
Mnemonic: 'You walk Shorter to a street Corner. You ride Longer on a Superhighway'

I: Radial tuberosity of the radius
Deep fascia of forearm (insertion of the bicipital aponeurosis)

Inn: Musculocutaneous Nerve (C5-C6)

A: Supination and flexion of forearm @ Elbow, weak flexor @ glenohumeral

Coracobrachialis

O: Coracoid process of Scapula

I: Anteromedial surface of humeral shaft

Inn: Musculocutaneous Nerve (C5-C6)

A: Adduction and flexion of forearm @ glenohumeral

Brachialis

O: Distal half of anterior humerus

I: Coronoid process of Ulna, Tuberosity of Ulna

Inn: Musculocutaneous Nerve (C5-C6), Radial Nerve (C7)

A: Flexion of forearm @ elbow

Triceps Brachii

O: Long head - infraglenoid tubercle of the scapula
Medial head - posterior surface of the humerus (inferior to radial groove)
Lateral head - posterior surface of the humerus (superior to radial groove)

I: Olecranon of ulna and fascia of the forearm

Inn: Radial Nerve (C6-C8)

A: Extension @ Elbow

Extension and adduction @ Shoulder (Long Head)

Flexor Carpi Ulnaris

O: Medial epicondyle of humerus, olecranon and posterior border of ulna

I: Pisiform, Hamate, base of metacarpal V

Inn: Ulnar Nerve (C7-T1)

A: Wrist flexion, wrist adduction

Palmaris Longus

(Absent in approx 10% of people)

O: Medial epicondyle of humerus

I: Flexor Retinaculum & palmar aponeurosis

Inn: Median Nerve (C7-C8)

A: Wrist flexion, tenses palmar aponeurosis

Flexor Carpi Radialis

O: Medial epicondyle

I: Base of metacarpals II-III

Inn: Median Nerve (C6-C7)

A: Wrist flexion & abduction

Pronator Teres

O: Medial supracondylar ridge (humerus) & Coronoid process (ulna)

I: Lateral surface of radius

Inn: Median Nerve (C6-C7)

A: Pronates forearm

Flexor Digitorum Superficialis

O: Humeroulnar head: Medial epicondyle of humerus, coronoid process of ulna

Radial head: Proximal half of anterior border of radius

I: Sides of middle phalanges II-V

Inn: Median Nerve (C8-T1)

A: Flexion @ PIP, MCP, Wrist

Flexor Digitorum Profundus

O: Proximal half of anterior surface of ulna, interosseous membrane

I: Palmar surfaces of distal phalanges of digits 2-5

Inn: Median Nerve (C8-T1)

A: Flexion @ DIP, PIP, MCP, Wrist

Flexor Pollicis Longus

O: Anterior surface of radius and interosseous membrane

I: Palmar surface of distal phalanx thumb

Inn: Median Nerve (C7, C8)

A: MCP and IP flexion of thumb

Pronator Quadratus

O: Distal anterior ulna

I: Distal anterior radius

Inn: Median Nerve (C7, C8)

A: Pronation of forearm

Brachioradialis

O: Lateral supracondylar ridge of humerus

I: Poximal to radial styloid

Inn: Radial Nerve (C5-C6)

A: Flexion of forearm when semi-pronated

Extensor Carpi Radialis Brevis

O: Lateral epicondyle

I: Posterior aspect base of metacarpal III

Inn: Radial Nerve (C5-C6)

A: Wrist extension, Radial deviation

Extensor Carpi Radialis Longus

O: Lateral supracondylar ridge of humerus

I: Posterior Aspect base of metacarpal II

Inn: Radial Nerve (C5-C8)

A: Extension of wrist, radial deviation

Extensor Digitorum

O: Lateral epicondyle

I: Extensor expansions II-V

Inn: Posterior Interosseous Nerve (C7, C8)

A: Finger extension II-V

Extensor Digiti Minimi

O: Lateral epicondyle of humerus

I: Extensor expansion digit V

Inn: Posterior Interosseous Nerve

A: Extension of digit V

Extensor Carpi Ulnaris

O: Lateral epicondyle, posterior ulna

I: base of metacarpal V

Inn: Posterior Interosseous Nerve (C7, C8)

A: Hand extension and adduction

Anconeus

O: Lateral epicondyle

I: Lateral surface Olecranon

Inn: Radial Nerve (C7-C8)

A: Forearm extension, stabilization of elbow

Supinator

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

I: Lateral, posterior, and anterior surfaces of proximal third of radius

Inn: Posterior Interosseous Nerve (C7, C8)

A: Supinates forearm

Abductor Pollicis Longus

O: Posterior surface of proximal half of radius, ulna and interosseus membrane

I: Base of metacarpal I, sometimes trapezium

Inn: Posterior Interosseous Nerve (C7, C8)

A: Hand extension, thumb abduction, thumb extension

Extensor Pollicis Brevis

O: Posterior surface of distal third of radius and interosseus membrane

I: Posterior aspect base of proximal phalanx I

Inn: Posterior Interosseous Nerve (C7, C8)

A: CMC and MCP extension digit I

Extensor Pollicis Longus

O: Posterior surface of middle third of ulna and interosseus membrane

I: Posterior distal phalanx thumb

Inn: Posterior Interosseous Nerve (C7, C8)

A: Extension of thumb thru DIP

Opponens Pollicis

O: Tubercle of trapezium bone, flexor retinaculum

I: Radial border metacarpal I

Inn: Median Nerve (C8, T1)

A: Opposition of thumb

Abductor Pollicis Brevis

O: Tubercles of scaphoid and trapezium bones, Flexor retinaculum

I: Lateral aspect of base of proximal phalanx 1 (via radial sesamoid bone)

Inn: Median nerve (C8, T1)

A: Thumb abduction

Flexor Pollicis Brevis

O: Superficial head: Flexor retinaculum, tubercle of trapezium bone

Deep head: Trapezoid and capitate bones

I: Lateral aspect of base of proximal phalanx 1

Inn: Superficial - Median Nerve

Deep- Ulnar Nerve

A: Thumb flexion

Opponens Digiti Minimi

O: Hook of hamate bone, flexor retinaculum

I: Ulnar aspect metacarpal V

Inn: Ulnar Nerve (C8, T1)

A: Flexion, Opposition of digit V

Abductor Digiti Minimi

O: Pisiform

I: Ulnar side of base of proximal phalanx of digit 5, Extensor expansion of digit 5

Inn: Ulnar Nerve (C8, T1)

A: Abducts digit V

Flexor Digiti Minimi

O: Hook of hamate, flexor retinaculum

I: Base proximal phalanx digit V

Inn: Ulnar Nerve (C8, T1)

A: Flexes little finger

Lumbricals

Mnemonic: '1 2 me, 3 4 u' (One to me, three for you)

O: Tendons of FDP

I: Extensor expansions of hand

Inn: 1-2 Median Nerve; 3-4 Ulnar Nerve

Mnemonic: '1 2 me[dian], 3 4 u[lnar]' (One to me, three for you)

A: MCP Flexion, IP Extension (Duck hands)

Palmar Interossei (PADs)

O: Ulnar side metacarpal II, radial side metacarpals III and IV

I: 1: Ulnar base of proximal phalanx/extensor expansion of digit 2

2 & 3: Radial base of proximal phalanges/extensor expansions of digits 4 and 5

Inn: Ulnar Nerve (C8, T1)

A: Adduction of fingers

Dorsal Interossei (DABs)

O: Adjacent sides metacarpals 1-5

I: 1 & 2: Radial bases of proximal

phalanges/extensor

expansions of digits 2 & 3

3 & 4: Ulnar bases of proximal

phalanges/extensor

expansions of digits 3 and 4

Inn: Ulnar Nerve (C8, T1)

A: Finger Abduction

Adductor Pollicis

O: Transverse head: Palmar base of metacarpal bone 3

Oblique head: Capitate bone, palmar bases of metacarpal bones 2 & 3

I: Medial base proximal phalanx I

Inn: Ulnar Nerve (C8, T1)

A: Adducts thumb