unit 1 AOIs full set

Opponens Pollicis: Origin

• trapezium

• scaphoid

• flexor retinaculum

Opponens Pollicis: Insertion

• entire lateral side of 1st metacarpal

Opponens Pollicis: Innervation

• recurrent branch of median nerve (C8, T1)

Opponens Pollicis: Action

• CMC: opposition

Adductor Pollicis: Origin

• Oblique head: capitate and base of 2nd and 3rd metacarpals

• Transverse head: anterior shaft of 3rd metacarpal

Adductor Pollicis: Insertion

• medial side of base of proximal phalanx 1st digit

Adductor Pollicis: Innervation

• deep branch of ulnar nerve (C8, T1)

Adductor Pollicis: Action

• MCP: adduction

• CMC: adduction 1st digit

Abductor Digiti Minimi: Origin

• pisiform

Abductor Digiti Minimi: Insertion

• medial base of proximal 5th phalanx

Abductor Digiti Minimi: Innervation

• deep branch of ulnar nerve (C8, T1)

Abductor Digiti Minimi: Action

• MCP: abduction of 5th phalange

Flexor Digiti Minimi Brevis: Origin

• hook of hamate

• flexor retinaculum

Flexor Digiti Minimi Brevis: Insertion

• medial base of proximal 5th phalange

Flexor Digiti Minimi Brevis: Innervation

• deep branch of ulnar nerve (C8, T1)

Flexor Digiti Minimi Brevis: Action

• MCP: flexion of 5th phalange

Opponens Digiti Minimi: Origin

• hook of hamate

• flexor retinaculum

Opponens Digiti Minimi: Insertion

• entire medial side of 5th metacarpal

Opponens Digiti Minimi: Innervation

• deep branch of ulnar nerve (C8, T1)

Opponens Digiti Minimi: Action

• CMC: opposition

Lumbricals: Origin

• 1&2: lateral two tendons of flexor digitorum profundus, associated with 2nd and 3rd phalanges

• 3&4: originate from medial three tendons of flexor digitorum profundus, associated with the 4th and 5th phalange

Lumbricals: Insertion

• lateral sides/aspects of extension expansions of 2nd-5th fingers

Lumbricals: Innervation

• 1&2: median nerve (C8, T1)

• 3&4: deep branch of ulnar nerve (C8, T1)

Lumbricals: Action

• DIP extension

• PIP extension

• MCP flexion

Palmar Interossei: Innervation

• deep branch of ulnar nerve (C8, T1)

Palmar Interossei: Action

• assist the lumbricals

• DIP extension

• PIP extension

• MCP flexion and adduction (PAD)

Dorsal Interossei: Innervation

• deep branch of ulnar nerve (C8, T1)

Dorsal Interossei: Action

• assist the lumbricals

• DIP extension

• PIP extension

• MCP flexion and abduction (DAB)

Supinator: Origin

• lateral epicondyle of humerus

• radial collateral and annular ligaments

Supinator: Insertion

• lateral, posterior, and anterior surfaces of 1/3 of radius

Supinator: Innervation

• deep branch of radial nerve (C7, C8)

Supinator: Action

• supinates forearm

Abductor Pollicis Longus: Origin

• posterior surface, proximal halves of ulna, radius, and interosseous membrane

Abductor Pollicis Longus: Insertion

• base of 1st metacarpal

Abductor Pollicis Longus: Innervation

• posterior interosseous nerve (C7, C8) continuation of deep branch from radial nerve

Abductor Pollicis Longus: Action

• extends wrist and thumb

• abducts thumb

Extensor Pollicis Brevis: Origin

• posterior surface of distal 1/3 of radius and interosseous membrane

Extensor Pollicis Brevis: Insertion

• dorsal aspect of base of proximal phalanx of thumb

Extensor Pollicis Brevis: Innervation

• posterior interosseous nerve (C7, C8) continuation of deep branch from radial nerve

Extensor Pollicis Brevis: Action

• extends wrist

• extends proximal phalanx of thumb

Extensor Pollicis Longus: Origin

• posterior surface of middle 1/3 of ulna and interosseous membrane

Extensor Pollicis Longus: Insertion

• dorsal aspect of base of distal phalanx of thumb

Extensor Pollicis Longus: Innervation

• posterior interosseous nerve (C7, C8) continuation of deep branch from radial nerve

Extensor Pollicis Longus: Action

• extends wrist

• extends distal phalanx of thumb

Extensor Indicis: Origin

• posterior surface of distal 1/3 of ulna

• interosseous membrane

Extensor Indicis: Insertion

• extensor expansion of 2nd finger

Extensor Indicis: Innervation

• posterior interosseous nerve (C7, C8) continuation of deep branch from radial nerve

Extensor Indicis: Action

• extends wrist

• extends 2nd finger

Flexor Digitorum Superficialis: Origin

• Humero-ulnar head: medial epicondyle, cornoid process of ulna

• Radial head: oblique line of radius

Flexor Digitorum Superficialis: Insertion

• passes through carpal tunnel

• sides of middle phalanx of medial four fingers

Flexor Digitorum Superficialis: Innervation

• median nerve (C7, C8, T1)

Flexor Digitorum Superficialis: Action

• flexes wrist

• flexes MCP

• flexes PIP

Flexor Pollicis Longus: Origin

• mid half of anterior radial shaft and adjacent interosseous membrane

Flexor Pollicis Longus: Insertion

• passes through carpal tunnel

• base of distal phalanx of thumb

Flexor Pollicis Longus: Innervation

• anterior interosseous nerve (from median nerve) C8, T1

Flexor Pollicis Longus: Action

• flexes wrist

• flexes 1st MCP

• flexes 1st PIP

Flexor Digitorum Profundus: Origin

• proximal ¾ of medial and anterior ulna and adjacent interosseous membrane

Flexor Digitorum Profundus: Insertion

• passes through carpal tunnel

• bases of distal phalanges of 2nd, 3rd, 4th, 5th digits

Flexor Digitorum Profundus: Innervation

• digits 2 and 3: median nerve, anterior interosseous branch (C8, T1)

• digits 4 and 5: ulnar nerve (C8, T1)

Flexor Digitorum Profundus: Action

• flexes wrist

• flexes DIP of 2nd, 3rd, 4th, and 5th digits

Pronator Quadratus: Origin

• distal 1/4 , anterior surface of ulna

Pronator Quadratus: Insertion

• distal 1/4, anterior surface of radius

Pronator Quadratus: Innervation

• anterior interosseous nerve from median nerve (C8, T1)

Pronator Quadratus: Action

• pronates forearm

Pronator Teres: Origin

• Deep ulnar head: medial epicondyle of humerus

• Superficial humeral head: coronoid process of ulna

Pronator Teres: Insertion

• middle, lateral surface of radius

Pronator Teres: Innervation

• median nerve (C6, C7)

Pronator Teres: Action

• pronates and flexes the elbow joint

Flexor Carpi Radialis: Origin

• medial epicondyle of humerus

Flexor Carpi Radialis: Insertion

• base of 2nd metacarpal

Flexor Carpi Radialis: Innervation

• median nerve (C6, C7)

Flexor Carpi Radialis: Action

• flexes and radially deviates (abducts) hand

Palmaris Longus: Origin

• medial epicondyle of humerus

Palmaris Longus: Insertion

• distal half of flexor retinaculum

• palmar aponeurosis

Palmaris Longus: Innervation

• median nerve (C7, C8)

Palmaris Longus: Action

• flexes hand

Flexor Carpi Ulnaris: Origin

• humeral head: medial epicondyle of humerus

• ulnar head: posterior olecranon of ulna

Flexor Carpi Ulnaris: Insertion

• pisiform

• hook of hamate

• 5th metacarpal

Flexor Carpi Ulnaris: Innervation

• ulnar nerve (C7, C8)

Flexor Carpi Ulnaris: Action

• flexes and ulnar deviates (adducts) hand

Biceps Brachii: Origin

• short head: tip of coracoid process of scapula

• long head: supraglenoid tubercle of scapula

Biceps Brachii: Insertion

• tuberosity of radius and fascia of forearm via bicipital aponeurosis

Biceps Brachii: Innervation

• musculocutaneous nerve (C5, C6)

Biceps Brachii: Action

• flexes elbow joint

• long head: supinates elbow, as well as flexes GHJ

• main elbow flexor with forearm supinated

Brachialis: Origin

• distal half, anterior surface of humerus

Brachialis: Insertion

• coronoid process and tuberosity of ulna

Brachialis: Innervation

• musculocutaneous nerve (C5, C6)

Brachialis: Action

• flexes elbow joint

• main elbow flexor with forearm pronated

Coracobrachialis: Origin

• tip of coracoid process of scapula

Coracobrachialis: Insertion

• middle 1/3 of medial surface of humerus

Coracobrachialis: Innervation

• musculocutaneous nerve (C5, C6, C7)

Coracobrachialis: Action

• flexes and adducts GHJ

Triceps Brachii: Origin

• long head: infraglenoid tubercle of the scapula

• medial head: posterior surface of humerus, inferior to radial groove

• lateral head: posterior surface of humerus, superior to radial grooven

Triceps Brachii: Insertion

• proximal end of olecranon of ulna and fascia of the forearm

Triceps Brachii: Innervation

• radial nerve (C6, C7, C8)

Triceps Brachii: Action

• Long head: elbow and GHJ extension

• medial and lateral head: elbow extension

Trapezius Origin

• medial third of superior nuchal line

• external occipital protuberance

• nuchal ligament

• spinous processes of C7-T12 vertebrae

Trapezius Insertion

• lateral third of clavicle

• acromion

• spine of scapula

Trapezius Innervation

• spinal accessory nerve (CN XI, motor)

• C3, C4 spinal nerves (pain and proprioceptive)

Trapezius Action

• elevates scapula (upper)

• retracts scapula (middle)

• depresses scapula (lower)

• upper and lower rotates the glenoid cavity superiorly