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MSM Muscles: U. Limb

Origin, Insertion, Action, Innervation

MuscleOriginInsertionActionInnervation
Pectoralis major anterior, medial half of clavicle; anterior surface of sternum; superior 6 costal cartilages; aponeurosis of external oblique muscle lateral lip of intertubercular groove of humerus adduction, medial rotation of humerus; anterior & inferior movement of scapula; role in flexion & extension of humerus lateral & medial pectoral nerves; clavicular head: C5-6, sternocostal head: C7-T1
Pectoralis minor ribs 3-5 near costal cartilages medial border & superior surface of coracoid process of scapula stabilization of scapula (draws scapula inferiorly & anteriorly) medial pectoral nerve (C8-T1)
Subclavius junction of rib 1 & its costal cartilage inferior surface of middle third of clavicle anchors & depresses clavicle C5-6
Serratus anterior external surfaces of lateral parts of ribs 1-8 anterior surface of medial border of scapula protracts & rotates scapula long thoracic nerve (C5-7)
Deltoid lateral third of clavicle, acromion, spine of scapula deltoid tuberosity of humerus anterior: flexion & medial rotation of arm; middle: abduction of arm; posterior: extension & lateral rotation of arm axillary nerve (C5-6)
Supraspinatus supraspinous fossa of scapula superior facet on greater tubercule of humerus initiates abduction of arm, acts with rotator cuff muscles suprascapular nerve (C4-6)
Infraspinatus infraspinous fossa of scapula middle facet on greater tubercule of humerus lateral rotation of arm; helps hold humeral head in glenoid cavity suprascapular nerve (C5-6)
Teres minor superior part of lateral border of scapula inferior facet on greater tubercule of humerus lateral rotation of arm, helps hold humeral head in glenoid cavity axillary nerve (C5-6)
Teres major dorsal surface of inferior angle of scapula medial lip of intertubercule groove of humerus adduction & medial rotation of arm lower subscapular nerve (C6-7)
Subscapularis subscapular fossa lesser tubercule of humerus adduction & medial rotation of arm, helps hold humeral head in glenoid cavity upper & lower subscapular nerves (C5-7)
Biceps brachii short head: tip of coracoid process of scapula; long head: supraglenoid tubercle of scapula tuberosity of radius & fascia of forearm via bicipital aponeurosis flexion (when supine) & supination of forearm musculocutaneous nerve (C5-6)
Coracobrachialis tip of coracoid process of scapula middle third of medial surface of humerus helps flex & adduct arm musculocutaneous nerve (C5-7)
Triceps brachii long head: infraglenoid tubercle of scapula, lateral head: posterior surface of humerus, superior to to radial groove; medial groove: posterior surface of humerus, inferior to radial groove proximal end of olecranon of ulna & fascia of forearm extension of forearm, long head stabilizes head of abducted humerus radial nerve (C6-8)
Brachialis distal half of anterior surface of humerus coronoid process & tuberosity of ulna flexes forearm in all positions musculocutaneous nerve (C5-6)
Anconeus lateral epicondyle of humerus lateral surface of olecranon & superior part of posterior surface of ulna extension of forearm, stabilization of elbow joint, abducts ulna during pronation radial nerve (C7-T1)
Pronator teres medial epicondyle of humerus, coronoid process of ulna middle of lateral surface of radius pronation & flexion of forearm median nerve (C6-7)
Flexor carpi radialis medial epicondyle of humerus base of second metacarpal flexion & abduction of hand meidan nerve (C6-7)
Palmaris longus medial epicondyle of humerus distal half of flexor retinalculum & palmar aponeurosis flexion of hand & tighening of palmar aponeurosis median nerve (C7-8)
Flexor carpi ulnaris humeral head: medial epicondyle of humerus; ulnar head: olecranon & posterior border of ulna pisiform, hook of hamate, 5th metacarparl flexion & adduction of hand ulnar nerve (C7-8)
Flexor digitorum superficialis humeroulnar head: medial epicondyle of humerus, ulnar colateral ligament, coranoid process of ulna; radial head: superior half of anterior border of radius middle phalanges 2-5 flexion of phalanges at interphalangeal & metacarpophalangeal joints median nerve (C7-T1)
Flexor digitorum profundis medial & anterior surfaces of ulna & interosseous membrane distal phalanges 2-5 flexion of phalanges at interphalangeal joints 2-5 & assists in flexion of hand medial part: ulnar nerve (C8-T1); lateral part: median nerve (C8-T1)
Flexor policis longus anterior surface of radius & interosseous membrane base of distal phalanx 1 flexes phalanges of digit 1 anterior interosseous nerve (C8-T1)
Pronator quadratus distal fourth of surface of ulna distal fourth of surface of radius pronation of forearm anterior interosseous nerve (C8-T1)
Brachioradialis later supercondylar ridge of humerus (common extensor attachment) lateral surface of distal radius flexion of forearm radial nerve (C5-7)
Extensor carpi radialis longus lateral supercondylar ridge base of second metacarpal extension & abduction of hand radial nerve (C6-7)
Extensor carpi radialis brevis lateral epicondyle of humerus (common extensor attachment) based of metacarpal 3 extension & abduction of hand radial nerve (C6-7)
Extensor digitorum lateral epicondyle of humerus extensor expansions of digits 2-5 extends digits 2-5 at metacarpophalangeal joint posterior interosseous nerve, branch of radial nerve
Extensor digiti minimi lateral epicondyle of humerus extensor expansion of digit 5 extenstion of digit 5 at metacarpophalageal & interphalangeal joints posterior interosseous nerve, branch of radial nerve
Extensor carpi ulnaris lateral epicondyle of humerus & posterior border of ulna base of 5th metacarpal extends & adducts hand at wrist joint posterior interosseous nerve (C7-8)
Supinator lateral epicondyl eof humerus, radial colateral & anular ligaments, supinator fossa & crest of ulna lateral, posterior & anterior surfaces of proximal third of radius supination of forearm deep branch of radial nerve (C5-6)
Extensor indicis posterior surface of ulna & interosseous membrane extensor expansion of 2nd digit extension of 2nd digit & helps in hand extension posterior interosseous nerve (C7-8)
Abductor pollicis longus posterior surfaces of ulna, radius, & interosseous membrane base of 1st metacarpal abducts thumb & extends it at carpometacarpal joint posterior interosseous nerve (C7-8)
Extensor pollicis longus posterior surface of middle third of ulna & interosseous membrane base of distal phalanx of thumb extension of distal phalanx of thumb at metacarpophalangeal & interphalangeal joints posterior interosseous nerve
Extensor pollicis brevis posterior surface of radius & interosseous membrane base of proximal phalanx of thumb extends proximal phalanx of thumb at carpometacarpal joint posterior interosseous nerve (C7-8)
Abductor pollicis brevis flexor retinaculum & tubercles of scaphoid & trapezium lateral side of base of proximal phalanx of thumb abducts thumb & helps oppose it recurrent branch of median nerve ( C8-T1)
Flexor pollicis brevis flexor retinaculum & tubercles of scaphoid & trapezium base of proximal phalanx of thumb flexes thumb recurrent branch of median nerve ( C8-T1)
Opponens pollicis flexor retinaculum & tubercles of scaphoid & trapezium lateral side of 1st metacarpal draws 1st metacarpal bone laterally to oppose thumb toward center of palm & rotates it medially recurrent branch of median nerve ( C8-T1)
Adductor pollicis oblique head: nases of 2nd & 3rd metacarpals, capitate, & adjacent carpals; transverse head: anterior surface fo body of 3rd metacarpal medial side of base of proximal phalanx of thumb adduction of thumb toward middle digit deep branch of ulnar nerve ( C8-T1)
Abductor digiti minimi pisiform medial side of proximal phalanx of 5th digit abduction of digit 5 deep branch of ulnar nerve ( C8-T1)
Flexor digiti minimi brevis hook of hamate & flexor retinaculum medial side of proximal phalanx of 5th digit flexes proximal phalanx of digit 5 deep branch of ulnar nerve ( C8-T1)
Opponens digiti minimi hook of hamate & flexor retinaculum medial side of proximal phalanx of 5th digit draws 5th metacarpal anteriorly & rotates it, brings 5th digit into opposition with thumb deep branch of ulnar nerve ( C8-T1)
Lumbricals 1 & 2 lateral two tendons of flexor digitorum profundus lateral sides of extensor expansions of digits 2 & 3 flex digits at metacarpophalangeal joints & extend interphalangeal joints median nerve ( C8-T1)
Lumbricals 3 & 4 medial 3 tendons of flexor digitorum profundus lateral sides of extensor expansions of digits 3 & 4 flex digits at metacarpophalangeal joints & extend interphalangeal joints deep branch of ulnar nerve ( C8-T1)
Dorsal interosseous 1 -4 adjacent sides of two metacarpals ( bipennate muscles) extensor expansions & bases of proximal phalanges digits 2-4 (DAB) abduction of digits from axial line & act with lumbricals to flex metacarpophalangeal joints deep branch of ulnar nerve (C8-T1)
Palmar interosseous 1-3 palmar surfaces of digits 2, 3, 5 metacarpals (unipennate nuscles) extensor expansions of digits & bases of proximal phalanges of digits 2, 4, 5 (PAD) adduction of digits 2, 4, 5 toward axial line & assist lumbricals in flexing metacarpophalangeal joints & extension of interpalangeal joints deep branch of ulnar nerve (C8-T1)
Created by: scobb