Exam 2 muscles AOI

masseter action

Elevates mandible and may protract mandible

masseter origin

Zygomatic arch

masseter insertion

Angle and ramus of mandible

temporalis action

Elevates and retracts the mandible

temporalis origin

temporal fossa

temporalis insertion

coronoid process of mandible

Deltoid actions

All fibers: abduct the shoulderAnterior fibers: flex the shoulder, internally rotate the shoulder, horizontally adduct the shoulderPosterior fibers: extend the shoulder externally rotate Shoulder, horizontally abduct the shoulder

deltoid origin

Lateral 1/3 of clavicle, accordion, spine of scapula

Deltoid insertion

Deltoid tuberosity

Trapezius actions

Upper fibers: extend head and neck, laterally flex head and neck to same side, rotate head and neck to opposite side, elevate scapula, upwardly rotate scapulaMiddle Fibers: retract scapula, stabilize scapulaLower fibers: depress scapula, upwardly rotate scapula

Trapezius origin

External occipital protuberance, ligamentum nuchae, spinous processes of C7-T12

Trapezius insertion

lateral 1/3 of clavicle, acromion, spine of scapula

latissmus dorsi action

Extend shoulder, adduct shoulder, internally rotates shoulder

Latissmus Dorsi Origin

Inferior angle of scapula, spinous process of T6-T12 vertebra, last 4 ribs, thoracolumbar fascia, and posterior iliac crest

Latissmus Dorsi Insertion

Bicipital Groove

Teres Major action

Extend shoulder, adduct shoulder, and internally rotates shoulder

Teres Major origin

Inferior angle and lower 1/3 of lateral border of the scapula

Teres Major insertion

Proximal medial humerus

supraspinatus action

abducts shoulder and stabilize head of humerus

Supraspinatus origin

Supraspinous fossa

Supraspinatus insertion

Greater tubercle

Infraspinatus action

External rotate shoulder, Adduct, shoulder, stabilize head of humerus

Infraspinatus origin

infraspinous fossa

Infraspinatus insertion

greater tubercle

Teres minor action

Externally rotate shoulder, adduce shoulder, stabilize head of humerus

Teres minor origin

Upper 2/3 of lateral border of scapula

Teres minor insertion

Greater tubercle

Subscapularis action

Internally rotate shoulder, stabilize humurus

Subscapularis origin

Subscapular fossa

Subscapularis insertion

Lesser tubercle

Rhomboid Major actions

Retract, elevate, and downwardly rotate scapula

Rhomboid Major origins

spinous processes of T2-T5

Rhomboid Major insertion

medial border of scapula

Rhomboid minor actions

Retracts, elevates, and downwardly rotates scapula

Rhomboid minor origin

spinous processes of C7-T1

Rhomboid minor insertion

Upper portion of medial border of the scapula, across from spine of the scapula

levator scapulae action

Unilaterally: ELEVATE and DOWNWARDLY ROTATE the scapula; LATERALLY FLEX the head and neck; ROTATE the head and neck to the same side.Bilaterally: EXTEND the head and neck.

levator scapulae origin

transverse processes of C1-C4

levator scapulae insertion

superior angle of scapula

serratus anterior action

With fixed origin; protract scapula, upwardly rotate scapula, depress scapula, hold medial border of scapula against ribcage

Serratus anterior origin

External surface of ribs 1-9

serratus anterior insertion

Anterior surface of medial border of the scapula

Pectoralis Major action

All fibers: adduct shoulder, internally rotate shoulderUpper fibers: flex shoulder, horizontally adduct shoulderCower fibers: extend shoulder

Pectoralis Major origin

Medial clavicle, sternum, and cartilage ribs 16

Pectoralis major insertion

greater tubercle of humerus

Pectoralis minor action

Depress the scapula, protract scapula, downwardly rotate scapula

Pectoralis minor origin

ribs 3-5

Pectoralis minor insertion

coracoid process of scapula

Subclavius action

Depress clavicle and draw it anteriorly, elevate the 1st rib, stabilize sc joint

Subclavius Origin

1st rib and cartilage

Subclavius Insertion

Inferior surface of middle 1/3 of clavicle

biceps brachii action

flex elbow, supinate forearm, flex shoulder

Biceps brachii origin

short head: coracoid process of scapulalong head: supraglenoid tubercle of scapula

biceps brachii insertion

radial tuberosity and bicipital aponeurosis

Triceps brachii actions

All heads: extend the elbowLong head: extend the shoulder, adduct the shoulder

Triceps brachii origin

Long head: infraglenoid tubercle of scapulaLateral head: posterior surface of humerus, superior to radial grooveMedial head: posterior surface of humerus, inferior to radial groove

triceps brachii insertion

olecranon process of ulna

Coracobrachialis actions

flexion and adduction the shoulder

Coracobrachialis origin

coracoid process of scapula

Coracobrachialis insertion

Medial surface of mid-humeral shaft

Brachialis action

flexes elbow

brachialis origin

Distal half of anterior surface of humerus

brachialis insertion

coronoid process of ulna

brachioradialis action

Flex the elbow, assist to pronate and supinate forearm

Brachioradialis origin

lateral supracondylar ridge of humerus

Brachioradialis insertion

styloid process of radius

pronator teres action

pronate forearm, flex elbow

Pronator teres origin

medial epicondyle of humerus and coronoid process of ulna

pronator teres insertion

middle of lateral surface of radius

Pronator quadratus action

pronates forearm

Pronator quadratus origin

Medial, anterior surface of distal ulna

Pronator quadratus insertion

Lateral, anterior surface of distal radius

Supinator action

supinates forearm

supinator origin

Lateral epicondyle of humerus, radial collateral ligament, annular ligament

Supinator insertion

Proximal 1/3 of radial shaft

Extensor carpi radialis action

Extend wrist, radial deviation of the wrist, weak elbow flexor

Extensor carpi radialis origin

lateral epicondyle of humerus

Extensor carpi radialis insertion

longus: base of 2nd metacarpal

Extensor carpi ulnas action

Extend the wrist, ulnar deviation

Extensor carpi ulnas origin

lateral epicondyle of humerus

Extensor carpi ulnas insertion

Base of 5th metacarpal

Extensor digitorum action

extends digits 2-5, extends wrist

Extensor digitorum origin

Lateral epicondyte of humerus

Extensor digitorum insertion

Bases of middle and distal phalanges of 2nd - 5th fingers

Flexor carpi radialis action

wrist flexion, radial deviation, elbow flexion

Flexor carpi radialis origin

medial epicondyle of humerus

flexor carpi radialis insertion

base of 2nd and 3rd metacarpals

palmaris longus action

Tense palmar fascia, flex wrist, weak elbow flexor

palmaris longus origin

medial epicondyle of humerus

palmaris longus insertion

flexor retinaculum and palmar aponeurosis

flexor carpi ulnaris action

wrist flexion, ulnar deviation, elbow flexor

flexor carpi ulnaris origin

Humeral head: medial epicondyle of humerusUlnar head: posterior surface of proximal 2/3 of vina

flexor carpi ulnaris insertion

pisiform, hook of hamate, base of 5th metacarpal

Flexor digitorum superficialis action

Flexion of digits 2-5 at MCP jointsFlexion of digits 2-5 at PIP jointsFlexion of wrist

flexor digitorum superficialis origin

Common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane and proximal shaft of radius

flexor digitorum superficialis insertion

middle phalanges of digits 2-5

flexor digitorum profundus action

flexion of digits 2-5 at DIPflexion of digits 2-5 at MCP jointsflexion of wrist

flexor digitorum profundus origin

Anterior and medial surfaces of proximal ulna

flexor digitorum profundus insertion

bases of distal phalanges of digits 2-5

anconeus action

extend elbow

Anconeus Origin

lateral epicondyle of humerus

anconeus insertion

Olecranon process and posterior, proximal surface of ulna

abductor pollicis longus action

abducts and extends thumb, radial deviation

abductor pollicis longus origin

posterior surface of radius and ulna, interosseous membrane

abductor pollicis longus insertion

base of 1st metacarpal

extensor pollicis longus action

extends thumb and radial deviation

extensor pollicis longus origin

Posterior surface of ulna and interosseous membrane

extensor pollicis longus insertion

base of distal phalanx of thumb

extensor pollicis brevis action

extends thumb and radial deviation

extensor pollicis brevis origin

Posterior surface of radius and interosseous membrane

extensor pollicis brevis insertion

base of proximal phalanx of thumb

flexor pollicis longus action

flexes thumb and wrist

flexor pollicis longus origin

anterior surface of radius and interosseous membrane

flexor pollicis longus insertion

base of distal phalanx of thumb

abductor pollicis brevis action

Abducts thumb and helps oppose it

abductor pollicis brevis origin

flexor retinaculum, scaphoid

abductor pollicis brevis insertion

base of proximal phalanx of thumb

flexor pollicis brevis action

flexes thumb and assists in opposition

flexor pollicis brevis origin

superficial head: flexor retinaculumdeep head: trapezium, trapezoid and capitate

flexor pollicis brevis insertion

base of proximal phalanx of thumb

Opponens Pollicis action

opposition of thumb

Opponens Pollicis origin

flexor retinaculum and trapezium

opponens pollicis insertion

Entire length of first metacarpal bone, radial surface

adductor pollicis action

adducts thumb, assists to flex thumb

Adductor pollicis origin

capitate, 2nd and 3rd metacarpals

adductor pollicis insertion

base of proximal phalanx of thumb

lumbricals action

Extend fingers at IP joints, flex fingers at MCP joints 2-5

Lumbricals origin

Surfaces of the flexor digitorum profundus tendons

lumbricals insertion

Extensor aponeurosis on dorsal surface of phalanges