Anatomy M01- Eric Shargo- Exam 2- Muscles

Sternocleidomastoid

Origin: Sternum

Insertion: Mastoid process

Action: Flexes neck/rotates head

pectoralis major

Origin: Clavicle

Insertion: humerus

Action: adducts arms, anterior position

pectoralis minor

origin: ribs

Insertion: scapula

action: protracts scapula

rectus abdominus

origin: pubic crest

insertion: xiphoid process

action: flexes trunk

external oblique

origin: lower ribs

insertion: ilium

action:rotates trunk / flexes trunk

internal oblique

origin: ilium

insertion: ilium

action: rotates trunk / flexes trunk

trapezius

origin: thoracic vertebrae

insertion: Scapula

action: elevates, depresses, retracts scapula

rhomboid major

origin:C7, T1-5 (Vertebrae)

insertion: Scapula

action: elevates and retracts scapula

rhomboid minor

origin:C7, T1-5 (Vertebrae)

insertion: Scapula

action: elevates and retracts scapula

levator scapulae

origin:vertebrae (cervical)

insertion: Scapula

action: elevates scapula

external intercostals

origin: inferior border of rib above

insertion: superior border of rib below

action: elevates ribs for inspiration (drawing in breath)

Iliocostalis lumborum

origin: sacrum

insertion: ribs

action:extends trunk

longissimus thoracis

origin: ilium

insertion: ribs

action: extend cervical spine

serratus anterior

origin: ribs

insertion: Scapula

action: protracts / rotates scapula

latissimus dorsi

origin: ilium

insertion: humerus

action: extends arm / adducts arm

deltoid

origin: scapula

insertion: humerus

action: flexes, extends, abducts arm

supraspinatus

origin: scapula

insertion: humerus

action:abduction of arm

infraspinatus

origin: scapula

insertion: humerus

action: lateral rotation of arm

tricpes brachii

origin: humerus

insertion: ulna

action: extends elbow

biceps brachii

origin: scapula

insertion: radius

action: flexes elbow / stabilizes shoulder articulation

Brachialis

origin: humerus

insertion: ulna

action: flexes elbow

Brachioradialis

origin: humerus

insertion: radius

action: flexes elbow

flexor carpi radialis

origin: humerus

insertion: metacarpals

action: flexes wrist

palmaris longus

origin: humerus

insertion: metacarpals

action: flexes wrist

flexor carpi ulnaris

origin: humerus

insertion: metacarpals

action: flexes wrist

pronator teres

origin: humerus

insertion: radius

action: pronates forearm

extensor carpi ulnaris

Origin: humerus

Insertion: metacarpal

Action: extend wrist

extensor carpi radialis longus

origin: humerus

insertion: metacarpal

action: extends wrist

extensor digitorum

origin: humerus

insertion: phalanges

action: extends digits

extensor digiti minimi

origin: humerus

insertion: phalange pinky

action: extends digit

Anconeus

origin: humerus

insertion: ulna

action: extends elbow

extensor pollicis brevis

origin: radius

insertion: phalange pollex

action: extends pollex

extensor pollicis longus

origin: radius

insertion: phalange pollex

action: extends pollex

abductor pollicis longus

origin: radius

insertion: metacarpal pollex

action: abducts pollex

flexor digitorum superficialis

origin: ulna

insertion: phalanges

action: flexes digits

flexor digitorum profundus

origin: ulna

insertion: phalanges

action: flexes digits

gluteus maximus

origin: ilium

insertion: femur

action: extends hip

gluteus medius

origin: ilium

insertion: femur

action: abducts thigh

Sartorius

origin: ilium

insertion: tibia

action: abduct thigh

rectus femoris

origin: ilium

insertion: patella

action: extend knee

vastus lateralis

origin: femur

insertion: patella

action: extends knee

vastus medialis

origin: femur

insertion: patella

action: extends knee

vastus intermedius

origin: femur

insertion: patella

action: extends knee

psoas major

origin: lumbar vertebrae

insertion: femur

action: flexes hip

adductor longus

origin: pubis

insertion: femur

action: rotates thigh

Pectineus

origin: pubis

insertion: femur

action: adducts thigh

adductor magnus

origin: pubis

insertion: femur

action: adducts thigh

Gracilis

origin: pubis

insertion: tibia

action: rotates thigh

biceps femoris

origin: ischium

insertion: fibula

action: flexes knee

Semitendinosus

origin: ischium

insertion: tibia

action: flexes knee

Semimembranosus

origin: ischium

insertion: tibia

action: flexes knee

tensor fasciae latae

origin: ilium

insertion: tibia

action: abducts thigh

Gastrocnemius

origin: femur

insertion: calcaneus

action: plantar flexion

Soleus

origin: tibiua

insertion: calcaneus

action: plantar flexion

fibularis longus

origin: fibula

insertion: metatarsal

action: plantar flexion

fibularis brevis

origin: fibulainsertion: metatarsalaction: plantar flexion

extensor digitorum longus

origin: fibula/tibia

insertion: phalanges on digits

action: extends digits

tibialis anterior

origin: tibia

insertion: metatarsal

action: dorsiflexion of foot

tibialis posterior

origin: fibula

insertion: navicular

action: plantar flexion

flexor digitorum brevis

origin: calcaneus

insertion: phalanges

action: flexes digits

teres major

origin: scapula

insertion: humerus

action: adducts arm

teres minor

origin: scapula

insertion: humerus

action: rotates arm

extensor carpi radialis brevis

origin: humerus

insertion: metacarpal

action: extends wrist