Muscle Name Origin Insertion Action Innervation Muscles of ...

Muscle Name Pectoralis Major Pectoralis Minor

Origin

Medial half of clavicle, front of sternum, costal

cartilage Ribs 2-5

Insertion Muscles of Upper Extremity Crest of greater tubercle (Lateral lip of bicipital groove)

Action

Horizontally adduct, medially rotate at shoulder

Coracoid process

Protract, depress, medially rotate scapula and elevate ribs

Innervation

Medical and lateral pectoral

Medial pectoral

Serratus Anterior Trapezius

Ribs 1-8

Ventral surfaces of the superior and inferior angles and vertebral

(medial) border of scapula

Protract and laterally rotate the scapula

Long Thoracic

Occipital bone, spines of C7 and T1-12, and ligamentum nuchae

Lateral 1/3 of clavicle, acromion, and spine of scapula

Laterally rotate scapula; upper portions can elevate scapula, lower portion can depress scapula

Cranial nerve 11, spinal accessory

nerve

Rhomboids Levator Scapulae Latissimus Dorsi

Spines of C7 and T1-5

Transverse Processes of C1-4

Thoracolumbar fascia, iliac crest, inferior angle of scapula and lower ribs

Vertebral (medial) border of scapula

Upper part of medial border of scapula

Intertubercular groove of humerus

Retract and medially rotate the scapula

Elevate scapula, medial rotation of scapula

Extend and adduct at shoulder, medially rotate at shoulder, and horizontally abduct away from

midline

Dorsal Scapular

3rd and 4th cervical spinal nerves

Middle subscapular (Thoracodorsal)

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Deltoid Teres Major

Lateral 1/3 clavicle, acromion, and spine of

scapula Inferior angle of scapula

Coracobrachialis Subscapularis Supraspinatus Infraspinatus Teres Minor

Long Head of Biceps Short head of biceps

Brachialis

Coracoid process of scapula

Subscapular fossa of scapula

Supraspinatus fossa of scapula

Infraspinatus fossa of scapula

Lateral border of scapula Supraglenoid tubercle of

scapula Coracoid process of

scapula Humerus

Lateral Head of Triceps

Long Head of Triceps

Humerus

Infraglenoid tubercle of scapula

Deltoid tuberocity of humerus

Crest of lesser tubercle of humerus Humerus

Abduct at shoulder; anterior fibers flex the shoulder, posterior fibers

extend the shoulder Medially rotates shoulder, and

adducts at shoulder Flex shoulder joint

Lesser tubercle of humerus Greater tubercle of humerus

Medially rotate shoulder, adduct at shoulder

Abduct at shoulder

Greater tubercle of humerus

Lateral rotation at shoulder

Greater tubercle of humerus Tuberosity of radius and to ulna

by the bicipital aponeurosis Tuberosity of radius and to ulna

by the bicipital aponeurosis Coronoid process of ulna and

ulnar tuberocity Olecranon of ulna

Lateral rotation at shoulder Flex elbow, supinate forearm, and

flex shoulder Flex elbow, supinate forearm, and

flex shoulder Flex elbow

Extend elbow

Olecranon of ulna

Extend elbow

Axillary

Lower subscapular Musculocutaneous Upper subscapular

Suprascapular Suprascapular

Axillary Musculocutaneous Musculocutaneous Musculocutaneous

Radial Radial

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Medial Head of Triceps

Brachioradialis Anconeus

Humerus

Lateral supracondylar line Lateral epicondyle

Extensor Carpi Radialis Longus and

Brevis Extensor Digitorum

Lateral epicondyle Later epicondyle

Extensor Digiti Minimi

Later epicondyle

Extensor Carpi Ulnaris

Abductor Pollicis Longus

Extensor Pollicis Brevis

Extensor Pollicis Longus

Extensor Indicis

Lateral epicondyle and ulna

Radius and ulna

Radius

Ulna

Ulna

Supinator

Lateral epicondyle and ulna

Olecranon of ulna

Distal radius Olecranon of ulna

Muscles of the Hand Base of 2nd metacarpal (long), base of 2nd and 3rd metacarpals

(brevis) Middle and distal phalanges of

fingers (digits 2-5) Joins tendons of extensor

digitorum Base of 5th metatarsal

Base of 1st metacarpal

Proximal phalanx of thumb

Distal phalanx of thumb

Joins tendons of extensor digitorum

Wraps around lateral surface of radius

Extend elbow

Flexes at elbow Extend elbow

Extend wrist, abduct, radially deviate wrist

Extends joints from wrist to DIP joints of digits 2-5

Extends wrist and all joints in digits

Extends wrist and adducts (ulnar deviation)

Abduct and extend at CMC joint

Extend CMC and MCP joints of the thumb

Extends CMC, MCP and IP joints of thumb

Extends all joints of index finger

Supinates at forearm

Radial Radial Radial Radial

Radial Radial Radial Radial Radial Radial Radial Radial

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Pronator Teres

Flexor Carpi Radialis Palmaris Longus

Flexor Carpi Ulnaris Flexor Digitorum Superficialis

Flexor Pollicis Longus

Flexor Digitorum Profundus

Medial supracondylar ridge of medial

epicondyle of humerus and coronoid of ulna Medial epicondyle Medial epicondyle Medial epicondyle Medial epicondyle of humerus and radius

Radius and interosseous membrane

Ulna and interosseous membrane

Pronator Quadratus Abductor Pollicis Brevis

Flexor Pollicis Brevis

Opponens Pollicis

Distal ulna Navicular and trapezium

Trapezium (superficial), trapezoid; capitate (deep)

Trapezium

Adductor Pollicis

Capitate, 2nd and 3rd metacarpals (oblique), 3rd metacarpal (transverse)

Lateral surface of radius

2nd and 3rd metacarpals Palmar fascia Pisiform

Middle phalanges of digits 2-5

Distal phalanx of thumb

Distal phalanges of digits 2-5

Distal radius Base of proximal phalanx

Radial side of proximal phalanx (superficial and deep) 1st metacarpal

Proximal phalanx (oblique and transverse)

Pronate forearm

Median

Flex/Radial deviation of wrist Flex wrist, tenses palmar fascia

Flex wrist and adduct wrist Flexes all joints from wrist to PIP

of digits 2-5 Flex wrist and all 3 joints of thumb

Median Median Ulnar Median

Median

Flex wrist, flex all joints to DIP in digits 2-5

Pronates forearm Abduct at CMC and MCP joints of

thumb Flex CMC and MCP of thumb

Flex and medially rotate at CMC joint

Adduct and flex at CMC and MCP joints

Media to radial side of muscle; ulnar to ulnar side of muscle

Median Median

Median; deep head by ulnar nerve Median

Ulnar

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Abductor Digiti Minimi Flexor Digiti Minimi Brevis Opponens Digiti Minimi Lumbricals of the hand Dorsal interossei of hand (4) Palmar interossei (3)

External Intercostals Internal Intercostals

Transversus Thoracis

Quadratus Lumborum

Psoas Major

Tendons of flexor digitorum profundus

Lower border of a rib Inner surface of a rib

Inner surface of body; xiphoid process Iliac crest

Upper 4 lumbar transverse processes; last thoracic; upper 4 lumbar discs; adjacent

vertebrae

Abduct MCP for digit 5 Flex MCP for digit 5

Flex CMC for digit 5

Radial side of extensor expansion of extensor digitorum

Flex MCP of digits 2-5, extend IP joints of digits 2-5

Abduct at MCP joint for digit 2-4

Lateral two, median; medial two, ulnar Ulnar

Thorax Upper border of rib below Upper border of rib below

Costal cartilages of ribs 2-6

Adduct MCP joints of digits 2,4, and 5

Ulnar

Elevate ribs during inspiration Draw ribs downward during forced

expiration Draw ribs downward

Intercostal nerves Intercostal nerves

Intercostal nerves

12th rib, transverse process of lumbar vertebrae

Lesser trochanter of femur

Lateral flexion of lumbar vertebrae Flexes hip joint

Branches of ventral rami of L1-4

Branches of ventral rami L2-4

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