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Muscles I

Muscles of the head, neck, abdomen, back, shoulder girdle and upper extremity

MuscleOriginInsertionAction(s)Innervation
Frontalis epicranial aponeurosis skin superior to supraorbital margin raises eyebrows temporal branch of facial nerve
Orbicularis Oculi medial wall of orbit circular path around orbit closes eye zygomatic branch of facial nerve
Orbicularis Oris muscle fibers surrounding opening of mouth skin at corner of mouth closes and puckers lips buccal branch of facial nerve
Zygomaticus Major Zygomatic bone upper lip smiling buccal branch of facial nerve
Buccinator Alveolar processes of maxila and mandible and pterygomandibular raphe Orbicularis Oris whistling or blowing buccal branch of facial nerve
Masseter Maxilla and zygomatic arch angle and ramus of mandible chewing (elevation of mandible) masseteric nerve
Temporalis Temporal bone coronoid process of mandible chewing (elevation of mandible)
Platysma fascia over deltoid and pectoralis major mandible, muscles around mouth and skin of lower face pouting; grimacing VII cranial
; Sternocleidomastoid sternum and clavicle mastoid process of temporal bone flexion of cervical vertebrae; lateral flexion and rotaion of head to opposite side XI cranial & C1-C4; cervical spinal accessory
Rectus Abdominis pubic crest and pubic symphasis cartilage of fifth to seventh ribs and xiphoid process flexes vertebral column; compresses abdomen
External Oblique inferior eight ribs iliac crest and linea alba flexion; lateral flexion (to same side); rotation (to opposite side)
Internal Oblique iliac crest, inguinal ligament and thoracolumgar fascia cartilage of last 3 or 4 ribs and linea alba flexion; lateral flexion (to same side); rotation (to same side)
Subclavius first rib clavicle (lateral third) depression of clavicle
Pectoralis Minor Ribs 3-5 coracoid process of scapula protraction, depression and downward medial rotation of scapula C8-T1; medial pectoral
Serratus Anterior superior 8-9 ribs medial border and inferior angle of scapula protraction and upward lateral rotation of scapula C5-C7; long thoracic
Trapezius (upper fibers) superior nuchal line of occipital bone, spines of C7-T12 vertebrae clavicle neck extension & elevation & upward lateral rotation of scapula C1-C4; cervical spinal accessory
Trapezius (middle fibers) superior nuchal line of occipital bone, spines of C7-T12 vertebrae acromion retraction C1-C4; cervical spinal accessory
Trapezius (lower fibers) superior nuchal line of occipital bone, spines of C7-T12 vertebrae spine of scapula depression & upward lateral rotation C1-C4; cervical spinal accessory
Levator Scapulae superior 4-5 cervical vertbrae superior angle of scapula elevation; downward medial rotation C5; dorsal scapular
Rhomboid Major Spines of T2-T5 vertebrae vertebral border of scapula, inferior to spine retraction; downward medial rotation C5; dorsal scapular
C4-C5; dorsal scapularRhomboid Minor Spines of C7-T1 vertebrae vertebral border of scapula, superior to spine retraction; downward medial rotation C4-C5; dorsal scapular
Erector Spinae (blank) (blank) extension, lateral flexion of vertebral column
Semispinalis transverse process of vertebra spinous process of vertebra 5-7 superior extension, lateral flexion of vertebral column
Multifidus transverse process of vertebra spinous process of vertebra 3-4 superior extension, lateral flexion of vertebral column
Rotatores transverse process of vertebra spinous process of vertebra 1-2 superior extension, rotation (to opposite side) of vertebral column
Pectoralis Major clavicle, sternum, costal cartilage of ribs 2-6 greater tubercle and intertubercular sulcus adduction and extension (sternal end); abduction and flexion (clavicular end); medial rotation C5-C7; lateral pectoral & C8-T1; medial pectoral
Latissimus Dorsi T7-L5, crest of sacrum & ilium, inferior 4 ribs intertubercular sulcus adduction, extension, medial rotation C6-C8; thoracodorsal
Deltoid (anterior fibers) acromial extremity of clavicle Deltoid tuberosity of humerus flexion, medial rotation C5-C6; axillary
Deltoid (lateral fibers) acromion of scapula Deltoid tuberosityDeltoid tuberosity of humerus abduction
Deltoid (posterior fibers) spine of scapula Deltoid tuberosity of humerus extension, lateral rotation
Subscapularis subscapular fossa lesser tubercle of humerus medial rotation C5-C6; upper & lower subscapular
Supraspinatus supraspinous fossa greater tubercle of humerus assists in abduction C5-C6; suprascapular
Infraspinatus infraspinous fossa greater tubercle of humerus lateral rotation, adduction C5-C6; suprascapular
Teres major inferior angle of scapula intertubercular sulcus of humerus extension, assists in adduction and medial rotation C5-C6; lower subscapular
Teres minor inferior lateral border of scapula greater tubercle of humerus lateral rotation, extension, adduction C5-C6; axillary
Coracobrachialis coracoid process of scapula middle of medial surface of shaft of humerus flexion, adduction
Biceps Brachii Supraglenoid tubercle (long head) and coracoid process of scapula (short head) radial tuberosity of radius flexes forearm, supinates forearm, flexes arm at shoulder joint
Brachialis distal anterior surface of humerus ulnar tuberosity and coronoid process of ulna flexes forearm
Brachioradialis lateral border of distal end of humerus superior to styloid process of radius flexes forearm, supinates/pronates forearm back to neutral position
Triceps brachii (long head) infraglenoid tubercle olecranon process of ulna extension of forearm
Triceps brachii (lateral head) lateral and posterior surface of humerus superior to radial groove. Olecranon process of ulna extension of forearm and arm
Triceps brachii (medial head) entire posterior surface of humerus superior to radial groove. Olecranon process of ulna. extension of forearm and arm.
Anconeus Lateral epicondyle of humerus Olecranon and superior portion of shaft of ulna Extends forearm
Pronator Teres Medial epicondyle of humerus Midlateral surface of radius Pronates forearm, weakly flexes forearm
Pronator Quadratus Distal portion of shaft of ulna Distal portion of shaft of radius Pronates forearm
Supinator Lateral epicondyle of humerus and ridge near radial notch of ulna Lateral surface of proximal one-third of radius Supinates forearm at radioulnar joints
flexor carpi radialis Medial epicondyle of humerus second and third metacarpals flexes and abducts hand
palmaris longus medial epicondyle of humerus flexor retinaculum weakly flexes hand
flexor carpi ulnaris medial epicondyle of humerus and superior posterior border of ulna pisiform, hamate and base of fifth metacarpal flexes and adducts hand
flexor digitorum superficialis Medial epicondyle of humerus, coronoid process of ulna middle phalanx of each finger flexes proximal and middle phalanxes and hand
flexor pollicis longus anterior surface of radius and interosseous membrane base of distal phalanx of thumb flexes distal phalanx of thumb
flexor digitorum profundus anterior medial surface of body of ulna base of distal phalanx of each finger flexes distal, middle and proximal phalanges of each finger and flexes hand
extensor carpi radialis longus lateral supracondylar ridge of humerus second metacarpal extends and abducts hand
extensor carpi radialis brevis lateral epicondyle of humerus third metacarpal extends and abducts hand at wrist joint
extensor digitorum lateral epicondyle of humerus distal and middle phalanges of each finger extends distal, middle and proximal phalanges of each finger, and extends hand
extensor digiti minimi lateral epicondyle of humerus tendon of extensor digitorum on 5th phalanx extends proximal phalanx of little finger and extends hand
Extensor carpi ulnaris lateral epicondyle of humerus and posterior border of ulna fifth metacarpal extends and adducts hand
Abductor pollicis longus posterior surface of middle of radius and ulna first metacarpal abducts and extends thumb; abducts hand
extensor pollicis brevis posterior surface of middle of radius base of proximal phalanx of thumb extends proximal phalanx of thumb; extends first metacarpal of thumb; extends hand
extensor pollicis longus posterior surface of middle of ulna base of distal phalanx of thumb extends distal phalanx of thumb; extends first metal carpal of thumb; abducts hand
Extensor indicis posterior surface of ulna tendon of extensor digitorum of index finger extends distal, middle and proximal phalanges of index finger; extends hand
Created by: srospenda