extensor compartement

1. BRACHIORADIALIS
EXTENSOR CARPI RADIALIS LONGUS
Origin lateral supracondylar ridge of humerus
Insertion Base 2nd metacarpal
Action Wrist extension and wrist abduction
Innervation Radial nerve (C5,C6, C7)
Artery supply Radial artery
EXTENSOR CARPI RADIALIS BREVIS
Origin lateral epicondyle of humerus
Insertion Base 3nd metacarpal
Action wrist abduction
Innervation Deep Branch Radial nerve (C7,C8))
Artery supply Radial artery
Origin Proximal 2/3 lateral supracondylar
ridge of humerus
Insertion Lateral surface distal end radius
Action Flexes forearm
Innervation Radial nerve (C5,C6, C7)
Artery supply Radial recurrent artery

2. EXTENSOR CARPI ULNARIS
Origin lateral epicondyle of humerus &
posterior border ulna
Insertion Base 5nd metacarpal
Action Wrist extension - wrist adduction
Innervation PIN (C7,C8)
Artery supply Ulna artery
ANCONEUS
Origin lateral epicondyle of humerus
Insertion Lateral surface olecranon, superior part
posterior surface ulna
Action Assisted tricep in extending forearm
Innervation Radial nerve (C7,C8,T1)
Artery supply Medial collateral artery
EXTENSOR DIGITORUM
Origin lateral epicondyle of humerus
Insertion Extensor extend medial four digit
Action Extend medial four digit at MCP,
extend hand at wrist joint
Innervation PIN (C7,C8), deep branch radial nerve
Artery supply Postero interoosseus artery

3. EXTENSOR DIGITI MINIMI
ABDUCTOR POLLICIS LONGUS
EXTENSOR POLLICIS LONGUS
Origin lateral epicondyle of humerus
Insertion Extensor expansion 5th digit
Action Extend 5th digit at MCP
Innervation PIN (C7,C8), deep branch radial nerve
Artery supply Interosseous reccurent artery
Origin Posterior surface ulna, radius and
interosseous membrane
Insertion Based 1st MCP
Action Abduct thumb, extend
carpometacarpal joint
Innervation PIN (C7,C8), deep branch radial nerve
Artery supply Posterior interosseous artery
Origin Posterior surface middle 1/3
ulna,interosseous membrane
Insertion Based distal phalanx of thumb
Action extend DIP thumb, carpometacarpal
joint, interphalangeal joint
Innervation PIN (C7,C8), deep branch radial nerve
Artery supply Posterior interosseous artery

4. EXTENSOR POLLICIS BREVIS
SUPINATOR
EXTENSOR INDICIS
Origin Posterior surface radius,interosseous
membrane
Insertion Based proximal phalanx of thumb
Action extend proximal thumb, at MCP joint
Innervation PIN (C7,C8), deep branch radial nerve
Artery supply Posterior interosseous artery
Origin Lateral epicondyle humerus, radial
collateral, annular ligament, supinator
fossa, crest of ulna
Insertion Lateral anterior posterior proximal
radius
Action Supinate forearm
Innervation deep branch radial nerve (C5,C6)
Artery supply recurrent interosseous artery
Origin Posterior surface of ulna and
interosseous mebrane
Insertion Extensor extend 2nd digit
Action Extend 2nd digit, extend the hand
Innervation PIN, deep branch radial nerve (C7,C8)
Artery supply Posterior interosseous artery