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Biceps Brachii

Origin: (short head) from coracoid process;

           (long head) from supraglenoid tubercle (scapula)

Insertion: radial tuberosity

Action: flexion and supination of forearm; flexion of arm

Innervation: musculocutaneous nerve

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Brachialis

Origin: anterior, distal surface of humerus

Insertion: tuberosity of ulna

Action: flexes forearm

Innervation: musculocutaneous nerve

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Brachioradialis

Origin: lateral  distal shaft of humerus 

Insertion: styloid process of radius 

Action: flexes forearm; assists in pronation and supination

Innervation: Radial nerve

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Coracobrachialis

Origin: Coracoid process of scapula

Insertion: Medial margin of shaft of humerus

Action: Adducts and flexes humerus

Innervation: Musculocutaneous nerve

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Deltoid

Origin: Anterior: clavicle

               Lateral: acromion process

  Posterior: scapular spine

Insertion: deltoid tuberosity of humerus

Action: Anterior: flexion and medial rotation

Lateral: abducts arm

Posterior: extension and lateral rotation

Innervation: Axillary nerve

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Extensor Carpi Radialis Brevis

Origin: lateral epicondyle of humerus

Insertion: base of metacarpal III

Action: extension and abduction at hand

Innervation: Radial nerve

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Extensor Carpi Radialis Longus

Origin: lateral supracondylar ridge of humerus

Insertion: base of metacarpal II

Action: extension and abduction at hand

Innervation: Radial nerve

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Extensor Carpi Ulnaris

Origin: lateral epicondyle of humerus; posterior shaft of ulna

Insertion: base of metacarpal V

Action: extends and adducts hand

Innervation: Radial nerve

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Extensor Digitorum

(superficial)

Origin: lateral epicondyle of humerus

Insertion: middle and distal phalanges 2-5

Action: extends fingers 2-5 and assists with wrist extension

Innervation: Radial nerve

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Flexor Carpi Radialis

Origin: medial epicondyle of humerus

Insertion: base metacarpal II and III

Action: flexes and abducts hand

Innervation: Median nerve

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Flexor Carpi Ulnaris

Origin: medial epicondyle of humerus; olecranon process of ulna 

Insertion: bases of metacarpal V, pisiform and hamate

Action: flexes and adducts hand

Innervation: Ulnar nerve

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Infraspinatus

Origin: infraspinous fossa of scapula

Insertion: greater tubercle of humerus

Action: lateral rotation of arm; holds humerus in glenoid cavity

Innervation: Suprascapular nerve

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Latissimus Dorsi

Origin: spinal processes of T6-T12 vertebrae, ribs 8-12, spines of lumbar vertebrae, and thoracolumbar fascia

Insertion: intertubercular groove of humerus

Action: extends, adducts, and medially rotates arm

Innervation: Thoracodorsal nerve

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Palmaris Longus

Origin: medial epicondyle of humerus

Insertion: palmar aponeurosis

Action: flexion hand (weak), tenses palmar aponeurosis

Innervation: Median nerve

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Pronator Teres

Origin: medial epicondyle of humerus and anterior proximal shaft of ulna 

Insertion: anterior mid-shaft of radius

Action: pronates forearm 

Innervation: Median nerve

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Subscapularis

Origin: subscapular fossa of scapula

Insertion: lesser tubercle of humerus

Action: medial rotation of arm, holds humerus in glenoid cavity

Innervation: upper and lower subscapular nerve

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Supinator

Origin: posterior proximal shaft of ulna

Insertion: proximal anterolateral surface of radius 

Action: supinates forearm 

Innervation: radial nerve

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Supraspinatus

Origin: supraspinous fossa of scapula

Insertion: greater tuberacle of humerus

Action: abducts arm, holds humerus in glenoid cavity

Innervation: Suprascapular nerve

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Teres Major

Origin: inferior angle  and lateral border of scapula

Insertion: intertubercular sulcus of humerus

Action: adducts and medially rotates arm

Innervation: Lower subscapular nerve

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Teres Minor

Origin: lateral border of scapula

Insertion: greater tubercle of humerus

Action: adduction and lateral rotation of arm, holds humerus in glenoid cavity

Innervation: Axillary nerve

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Triceps Brachii

Origin: (Lateral) shaft of humerus

(Long) Infraglenoid tubercle of scapula

(Medial) shaft of humerus

Insertion: Olecranon process of ulna

Action: (Lateral) extends forearm

(Long) extends forearm and arm

(Medial) extends forearm

Innervation: Radial nerve

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Adductor Pollicis

Origin: Metacarpals II and III, trapezoid trapexium, and capitate

Insertion: proximal phalanx of thumb

Action: adducts thumb

Innervation: Ulnar nerve

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Abductor Pollicis Longus

(deep)

Origin: proximal surfaces of ulna and radius

Insertion: base of 1st metacarpal

Action: abducts thumb; extension of thumb

Innervation: Radial nerve

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Extensor Digiti Minimi

(superficial)

Origin: lateral epicondyle of humerus

Insertion: middle and distal phalanx of little finger 

Action: extension of little finger

Innervation: radial nerve

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Extensor Indicies

Origin: ulna and interosseous membrane

Insertion: distal phalanx of index finger

Action extension of index finger

Inervation: Radial nerve

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Extensor Pollicis Brevis

Origin: radius and interosseous membrane

Insertion: proximal phalanx of thumb

Action: extension of thumb

Innervation: Radial nerve

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Extensor Pollicis Longus

Origin: radius and interosseous membrane

Insertion: distal phalanx of thumb

Action: extension of tumb

Innervation: Radial Nerve

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Flexor Digitorum Profundus

(Deep)

Origin: ulna and interosseous membrane

Insertion: distal phalanges 2-5

Action: flexes fingers 2-5

Innervation: Lateral: median nerve

Medial: ulnar nerve

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Flexor Digitorum Superficialis

(superficial)

Origin: medial epicondyle of humerus; coronoid process of ulna and proximal anterior surface of radius

Insertion: middle phalanges 2-5

Action: flexes fingers 2-5

Innervation: Median nerve

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Flexor Pollicis Longus

(deep)

Origin: radius and interosseous membrane

Insertion: distal phalanx of thumb

Action: flexes thumb

Innervation: Median nerve

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Pronator Quadratus

Origin: anterior distal shaft of ulna

Insertion: anterior distal shaft of radius

Action: Pronates forearm

Innervation: Median nerve