Muscles: Action, Origin, Insertion, Nerve Innervation Flashcards by nick poulos

Upper Trap: A, O, I, N

A: Scap elevation and upward rotation
O: Occipital bone, nuchal ligament on upper cervical processes
I: Outer 1/3 of clavicle & acromion process
N: Spinal accessory C3-4

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Middle Trap: A, O, I, N

A: Scapular retraction
O: Spinous processes of C7- T3
I: Spine of scapula
N: Spinal accessory C3-4

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Lower Trap: A, O, I, N

A: Scapular depression and upward rotation
O: Spinous processes of middle & lower thoracic vertebrae
I: Base of the scapular spine
N: Spinal accessory C3-4

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Levator Scapula: A, O, I, N

A: Scapular elevation & downward rotation
O: Transverse process of C1-4
I: Superior angle of scapula
N: Cervical C3-4 & Dorsal scapular C4-5

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Rhomboid Minor: A, O, I, N

A: Scapular retraction, elevation, & downward rotation
O: Spinous processes of C7-T1
I: Vertebral border of scapula b/t the spine & inferior angle
N: Dorsal scapular C4-5

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Rhomboid Major: A, O, I, N

A: Scapular retraction, elevation, & downward rotation
O: Spinous processes of T2-T5
I: Medial border of scapula b/t the spine & inferior angle
N: Dorsal scapular C4-5

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Serratus Anterior: A, O, I, N

A: Scapular Protraction & upward rotation
O: Lateral surface of upper 8 ribs
I: Anterior surface of vertebral border of the scapula
N: Long thoracic nerve C5-7

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Pectoralis Minor: A, O, I, N

A: Scapular depression, protraction, downward rotation & tilt
O: anterior surface of 3rd-5th ribs
I: Coracoid process of the scapula
N: Medial pectoral nerve C8- T1

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Pectoralis Major: A, O, I, N

A: All fibers- GH joint ADD & IR
Upper fibers- GH joint flexion & horizontal ADD
Lower fibers- GH joint Extension
O: Clavicular portion: Medial half of clavicle
Sternal portion: Sternum, costal cartilage of 1-6 ribs
I: Crest of greater tubercle
N: Upper fibers- C5-7/ Lower fibers C6-T1

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Anterior Deltoid: A, O, I, N

A: Shoulder ABD, Flex, IR, Horz. ADD
O: Lateral 1/3 of clavicle
I: Deltoid tuberosity
N: Axillary nerve C5-6

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Middle Deltoid: A, O, I, N

A: Shoulder ABD
O: Acromion process
I: Deltoid tuberosity
N: Axillary nerve C5-6

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Posterior Deltoid: A, O, I, N

A: Shoulder ABD, EXT, ER, Horz ABD & hyperextension
O: Spine of scapula
I: Deltoid tuberosity
N: Axillary nerve C5-6

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Supraspinatus: A, O, I, N

A: Shoulder ABD
O: Suprspinous fossa of the scapula
I: Greater tubercle of the humerus
N: Suprascapular nerve C5-6

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Latissimus Dorsi: A, O, I, N

A: Shoulder EXT, ADD, IR & hyperextension
O: Spinous processes of T7-L5, post. surface of sacrum, iliac crest & lower 3 ribs
I: Medial portion of bicipital groove
N: Thoracodorsal nerve C6-8

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Teres Major: A, O, I, N

A: Shoulder EXT, ADD, IR
O: Axillary border of scapula near the inferior angle
I: Crest below lesser tubercle
N: Lower subscapular nerve C5-7

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Infraspinatus: A, O, I, N

A: Shoulder ER, Horz ABD
O: Infraspinous fossa of scapula
I: Greater tubercle of humerus
N: Suprascapular nerve C5-6

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Teres Minor: A, O, I, N

A: Shoulder ER, Horz ABD
O: Axillary border of scapula
I: Greater tubercle of humerus
N: Axillary nerve C5-6

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Subscapularis: A, O, I, N

A: Shoulder IR
O: Subscapular fossa of scapula
I: Lesser tubercle of humerus
N: Upper & lower subscapular nerve C5-6

Coracobrachialis: A, O, I, N

A: Stabilizes the shoulder joint
O: Coracoid process
I: Medial surface of the humerus near the midpoint
N: Musculocutaneous nerve C6-7

Brachialis: A, O, I, N

A: Elbow flexion
O: Anterior surface of distal half of humerus
I: Coronoid process & ulnar tuberosity of the ulna
N: Musculocutaneous nerve C5-6

Biceps brachii: A, O, I, N

A: Elbow flexion, forearm supination
O: Long head- supraglenoid tubercle of scapula
Short head- coracoid process of scapula
I: Radial tuberosity of radius
N: Musculocutaneous nerve C5-6

Brachioradialis: A, O, I, N

A: Elbow flexion
O: Lateral supracondylar ridge
I: Styloid process of the radius
N: Radial nerve C5-6

Triceps Muscle: A, O, I, N

A: Elbow extension
O: Long head- infraglenoid tubercle on the scapula
Lateral head- inferior to greater tubercle on posterior humerus
Medial head- posterior surface of humerus
I: Olecrannon process
N: Radial nerve C7-8

Anconeus: A, O, I, N

A: Assists in elbow extension
O: Lateral epicondyle of humerus
I: Later & inferior to olecrannon process of ulna
N: Radial nerve C7-8

Pronator Teres: A, O, I, N

A: Forearm pronation, assists in elbow flexion O: Medial epicondyle of humerus & coronoid process of ulna I: Lateral aspect of radius N: Median nerve C6-7

Pronator Quadratus: A, O, I, N

A: Forearm pronation O: Distal 1/4 of ulna I: Distal 1/4 of radius N: Median nerve C8-T1

Supinator: A, O, I, N

A: Forearm supination O: Lateral epicondyle of humerus & adjacent ulna I: Anterior surface of the proximal radius N: Radial nerve C6

Flexor Carpi Ulnaris: A, O, I, N

A: Wrist flexion, ulnar dev. O: Medial epicondyle of humerus I: Pisiform & base of 5th metacarpal N: Ulnar nerve C8-T1

Flexor Carpi Radialis: A, O, I, N

A: Wrist flexion, radial dev O: Medial epicondyle of humerus I: Base of 2nd -3rd metacarpals N: Median nerve C6-7

Palmaris Longus: A, O, I, N

A: Assist in wrist flexion O: medial epicondyle of humerus I: Palmar fascia N: Median nerve C6-7

Extensor Carpi Radialis Longus: A, O, I, N

A: Wrist ext and radial dev O: Supracondylar ridge of humerus I: Base of 2nd metacarpal N: Radial nerve C6-7

Extensor Carpi Radialis Brevis: A, O, I, N

A: Wrist ext O: Lateral epicondyle of humerus I: Base of 3rd metacarpal N: Radial nerve C6-7:

Extensor Carpi ulnaris: A, O, I, N

A: Wrist ext, ulnar dev O: Lateral epicondyle of humerus I: Base of 5th metatarsal N: Radial nerve C6-8

Abductor Pollicis Longus: A, O, I, N

A: Thumb ABD, EXT/ Wrist radial deviation O: Posterior surface of radius and ulna I: Base of 1st metacarpal N: Radial C6-8

Extensor Pollicis Brevis: A, O, I, N

A: Thumb ext/ Wrist radial deviation O: Posterior surface of the radius & interossesous membrane I: Base of proximal phalanx of thumb N: Radial C6-8

Extensor Pollicis Longus: A, O, I, N

A: Thumb ext/ Wrist radial deviation O: Posterior surface of the radius & interossesous membrane I: Base of proximal phalanx of thumb N: Radial C6-8

Extensor Indicis: A, O, I, N

A: 2nd finger EXT & ADD O: Posterior surface of distal shaft of ulna & interosseus membraine I: Tendon of the extensor digitorum at the level of the 2nd metacarpal N: Radial C6-8

Flexor pollicis brevis: A, O, I, N

``` A: Thumb flex/ Assist in opposition O: Superficial head- flexor retinaculum Deep head- Trapezium, trapeziod, capitate I: Base of proximal phalanx of thumb N: Superficial head Median C6-8, T1 Deep head Ulnar C8 & T1 ```

Flexor Digiti Minimi Brevis: A, O, I, N

A: Flex the 5th finger O: Hook of hamate & flexor retinaculum I: Base of proximal phalanx of 5th finger, palmar surface N: Ulnar C7-8, T1

Flexor Pollicis Longus: A, O, I, N

A: Thumb flex/ Assist in wrist flexion O: Anterior surface of radius & interosseous membrane I: Base of distal phalanx of thumb N: Median C6-8, T1

Flexor Digitorum Profundus: A, O, I, N

A: Flex 2nd-5th fingers O: Anterior & medial surfaces of proximal 3/4 of ulna I: Bases of distal phalanges, palmar surface of 2nd- 5th fingers N: 2nd & 3rd Median C7-8, T1 4th & 5th Ulnar C7-8, T1

Flexor Digitorum Superficialis: A, O, I, N

A: Flex 2nd- 5th fingers & Wrist flexion O: Common flexor tendon from medial epicondyle of humerus I: Sides of middle phalanges 2nd- 5th fingers N: Median C7-8, T1

Abductor Pollicis Brevis: A, O, I, N

A: Abduct thumb/ Opposition O: Flexor retinaculum, trapezium, & scaphoid tubercles I: Base of proximal phalanx of thumb N: Median C6-8, T1