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UE Muscles

Origins, Insertions, Actions and Innervations of UE Muscles

MuscleOriginInsertionInnervationAction
Upper Trapezius external occipital protuberance medial 1/3 of superior nuchal line ligamentum nuchae spinous process of 7th cervical vertebrae lateral 1/3 of clavicle and acromion process spinal accessory CXI and ventral rami of C3,4. scapular elevation upward rotation of scapula scapular retraction
Middle Trapezius spinous process of thoracic vertebrae 1-5 superior border of spine of scapula spinal accessory CXI and ventral rami, C3,4 scapular retraction and elevation
Lower Trapezius spinous process of thoracic vertebrae 6-12 medial 1/3 of spine of scapula spinal accessory CXI and ventral rami, C3, 4 scapular depression, retraction and upward rotation
Levator Scapulae transverse process of cervical 1-4 vertebral border of scapula, between superior angle and scapular spine dorsal scapular C5, and ventral rami of C3,4 scapular elevation, downward rotation, and retraction
Rhomboid Major Spinous process of thoracis 2-5 medial border of scapula from spine to inferior angle dorsal scapular, C5 scapular retraction, elevation, downward rotation
Rhomboid Minor lower part of ligamentum nuchae, spinous process of C7 and T1 medial border of capula at the root of the spine of the scapula dorsal scapular, C5 scapular retraction, elevation and downward rotation
Deltoid A: lateral 1/3 of clavicle, M: acromion process, P: inferior spine of scapula deltoid tuberosity Axillary, C5, 6 A: abduction, horizontal flexion and med. rotation; M: abduction, P: abduction, horiz ext., lat rotation.
Serratus Anterior superior lateral surfaces of upper 8 or 9 ribs costal surface of vertebral border along inferior angle of scapula Long thoracic, C5,6,7. scapular protraction, upward rotation, stabilization
Subclavius 1st rib at the jct of costal cartilage groove on inf. clavicle (btwn costoclavicular and conoid lig) subclavian branch of brachial plexus, C5,6 depresses clavicle and pulls inferiorly and anteriorly
Pectoralis Minor anterior surface of 3rd, 4th, 5th ribs coracoid process of scapula medial pectoral nerve from brachial plexus, C6, 7, 8 protraction with fixed ribs, elevates ribs with coracoid fixed (scapular depression, downward rotation, stabilization)
Pectoralis Major C: ant surface of med. 1/2 clavicle; S: sternum to 7th rib, cartilages of true ribs and aponeurosis of ext. obliques lateral lip of the intertubercular sulcus of the humerus (bicipital groove); crest of greater tubercle C:lateral pectoral C5, 6 S: lateral and medial pectoral, C7,8, T1. flexion, adduction, horiz. flexion, medial rotation. S also extends flexed humerus
Latissimus Dorsi Broad aponeurosis that originates on the spinour processes of T6-12 and L's, post. crest of ilium, post surface of sacrum, lower 3-4 ribs and attachment to inf. angle of scapula flat tendon that twists upon itself to insert into the intertubercular sulcus Thoracodorsal from brachial plexus, C6,7,8 extends, retracts and medially rotates the humerus at the shoulder
Teres Major dorsal surface of inferior angle of the scapula on lower 1/3 of scapular axillary border intertubercular groove (medial lip) lower subscapular, C5-7 adducts and medially rotates humerus at the shoulder, extends shoulder
Infraspinatus infraspinatus fossa post. aspect of greater tubercle suprascapular, C5-6 lateral rotation of humerus, stabilization of joint.
supraspinatus medial 2/3 of supraspinatus fossa superior surface of greater tubercle suprascapular, C5-6 abduction of humerus, stabilization of joint.
teres minor superior 2/3 of dorsal surface of axillary border of scapula inf. aspect of greater tubercle Axillary, C5-6 lateral rotation of humerus; stabilization of head of humerus.
subscapularis entire anterior surface of the subscapular fossa lesser tubercle of humerus upper and lower subscapular, C5,6,7 medial rotation of the humerus, stabilization of joint
Coracobrachialis Coracoid Process roughening in the medial shaft musculocutaneous, C5-7 flexes arm at glenohumeral joint
Biceps Brachii supraglenoid tubercle on scapula(long) and coracoid process (short) radial tuberosity musculocutaneous, C5-6 forearm flexion and supination
Brachialis anterior aspect of the humerus and adjacent intermuscular septae tuberosity of the ulna musculocutaneous, C5-6 (and some C7 from Radial N.) forearm flexion
Triceps Brachii infraglenoid tubercle(long), superior 1/2 of post. humerus(lat), inferior 2/3 of post. humerus (medial) olecranon process of ulna radial, C6-8 extension of forearm (long also adducts shoulder)
Anconeus Posterior lateral epicondyle lateral olecranon; upper 1/4 of post surface of ulna radial, C7-8 extends elbow (and stabilize during pronation)
Pronator Teres medial epicondyle(humeral) and medial coronoid process (ulnar) middle 1/3 lateral radius median, C6-7 pronation and flexion
Flexor Carpi Radialis medial epicondyle anterior surface of base of 2nd and 3rd metacarpal median, C6-7 flexion and radial deviation
Palmaris Longus medial epicondyle palmar aponeurosis median, C7-8 flexion at wrist
Flexor Carpi Ulnaris medial epicondyle posterior border of ulna ulnar, C7-8 and T1 wrist flexion and ulnar deviation
Flexor Digitorum Superficialis medial epicondyle and coronoid process(humeroulnar), oblique line of radius (radial) 4 tendons to base of middle phalanges median, C8 and T1 wrist flexion, MCP jt and IP jt flexion
Flexor Digitorum Profundus Anteromedial surface of ulna and anteromedial surface of interosseus membrane palmar surface of distal phalynx median (lat. half) and ulnar (medial half), C8 and T1 flexes DIP, MP and wrist
Flexor Pollicus Longus anterior surface of radius and radial 1/2 of interosseus base of distal phalynx of thumb median(ant. interosseus), C7-8 flexes IP of thumb/mp
Pronator Quadratus linear ridge on distal anterior surface of ulna distal ant. surface of radius median nerve (ant. interosseus), C7-8 pronation
Brachioradialis proximal supracondylar ridge of humerus lateral aspect of distal radius radial, C5-6 flex neutral forearm (pronate/supinate to neutral)
Extensor Carpi Radialis Brevis lateral epicondyle posterior surface of 3rd metacarpal deep radial, C7-8 extension and radial deviation
Extensor Digitorum lateral epicondyle 4 tendons, split 1 to dorsal MP and 2 to DP post. interosseus C7-8 extends fingers
Extensor Digiti Minimi lateral epicondyle PP of little finger post. interosseus, C7-8 extends little finger
Extensor Carpi Ulnaris lateral epicondyle and post. border of ulna post. surface of 5th metacarpal post. interosseus, C7-8 extends and ulnarly deviates wrist
Supinator lateral epicondyle, radial collateral lig., annular lig, supinator crest of the ulna lateral surface of radius Deep Radial, C6-7 supination
Abductor Pollucis Longus prox. post ulna, radius, interosseus membrane lateral base of 1st metacarpal post. interosseus, C7-8 abducts MCP jt at thumb
Extensor Pollucis Brevis post. radius and post. interosseus membrane proximal phalynx base post. interosseus, C7-8 extends proximal phalynx
Extensor Pollucis Longus mid 1/3 of ulna and interosseus membrane DIP post. interosseus, C7-8 Extends DIP
Extensor Indicis Posterior ulna and interosseus membrane ext. hood of index (ex. digit tendon) post. interosseus, C7-8 Extends phalanges of index
Extensor Carpi Radialis Longus Distal lateral supracondylar ridge dorsal surface of base of 2nd metacarpal Radial, C6-7 wrist extension and radial deviation with coulpled with flexor carpi radialis)
Created by: jpowley on 2007-09-04



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