Muscles

Frontalis

Frontalis

action: raises eyebrows

Occipitalis

action: pulls scalp posteriorly

Orbicularis Oculi

origin: frontal bone;maxilla
insertion: encircles orbit
action: closes eyes

Obicularis Oris

origin: maxillary and mandible "
insertion: encircles mouth
action: closes mouth

Mentalis

origin: mandible below incisors
insertion: skin of chin
action: protrudes lower lip

Buccinator

origin: mandible
insertion: orbicularis oris
action: compresses cheeks

Masseter

origin: zygomatic arch
insertion: mandible
action: closes jaw

Temporalis

origin; temporal fossa
insertion: coronoid process of mandible
action: closes jaw

Platysma

origin: fascia of chest
insertion: lower margin of mandible
action:depresses mandible

sternocleiodmastoid

origin: manubrium of sternum
insertion: mastoid process
action: flexion of neck

scalenes

origin: cervical vertebrae
insertion: first two ribs
action: flex and slightly rotate the neck

Pectoralis Major

origin:clavicle, sternum, first 6 ribs
insertion: interbubercular Grove of humerus
action prime mover of am flexion

Serratus Anterior

origin: lateral aspect of 8 ribs
insertion: vertebral border of scapula
action: moves scapula towards the chest

Deltoid

origin: clavicle
insertion: deltoid tubrosity of humerus
action: prime mover of arm abduction

Pectoralis minor

origin: third, fourth, and fifth ribs
insertion: coracoid process of scapula
action: draws scapula forward an inferiorly

External Intercostals

action: elevate rib cage

internal intercostals

action: depress rib cage

Diaphragm

action: prime mover of inspiration

Rectus Abdominis

origin: pubic crest and symphysis
insertion: xiphoid process 5-7 rib
action: flexes and rotates vertebral column

External oblique

origin: last 8 ribs
insertion: pubic crest
action: aid muscles in back in trunk rotation

internal oblique

origin:illiac crest
insertion: pubic crest
action: x

transverse abdominis

origin: illiac crest, last 5 or 6 ribs
insertion: pubic crest
action: compresses abdominal contents

trapezius

origin:occipital bone
insertion: acromion and spinous process of scapula
action:prime mover of arm extension

latissimus Doris

origin: lower 6 thoracic vertebrae, 3-4 ribs
insertion: intertubercular groove of humerus
action: prime mover of arm extension

Infraspinatus

origin: infraspinous fossa of scapula
insertion: greater tubercle of humerus
action:lateral rotation of humerus

Teres Minor

origin: scapula
insertion: greater tubercle of humerus
action: x

teres major

origin: scapula
insertion: intertubercular groove of humerus
action: extends, medially rotates and adducts humerus

supraspinatus

origin: supraspinous fossa of scapula
insertion: greater tubercle of humerus
action: assist abduction of humerus

Levator Scapulae

origin: C1 through C4
insertion: scapula
action: elevates and adducts scapula: flexes neck

triceps brachii

origin: glenoid cavity
insertion: olecranon process of ulna
action: powerful forearm muscle extensor

Biceps Brachii

origin: coracoid process
insertion: radial tuberosity
action: flexion of elbow

brachioradialis

origin: distal humerus
insertion: styloid process of the radius
action: synergist in forearm flexion

brachialis

origin: distal humerus
insertion: coronoid process of ulna
action: major flexor of forearm

Pronator teres

origin: medial epicondyle of humerus
insertion: midhsaft radius
action: acts synergistically with pronator quadratus to pronate forearm

flexor Carpi radialis

origin: media; epicondyle of humerus
insertion: second and third metacarpls
action: powerful flexor of wrist

Palmaris Longus

origin: medial epicondyle of humerus
insertion: skin and fascia of palm
action: Tenses skin and fascia of palm

flexor Carpi ulnaris

Origin: medial epicondyle of humerus
insertion: fifth metacarpal
action: powerful flexor of wrist

Flexor Digitorum Superficialis

origin: medial epicondyle of humerus
insertion: middle phalanges
action: flexes wrist and middle phalanges

Flexor Pollicis Longus

origin: radius
insertion: thumb
action: flexes thumb

Pronator quadratus

origin: distal ulna
insertion: distal radius
action: pronates forearm

Extensor Carpi radialis Longus

origin: lateral humerus
insertion: second metacarpal
action; extends and abducts wrist

extensor digitorum

origin: lateral epicondyle of humerus
insertion: distal phalanges
action: prime mover of finger extension

extensor Carpi ulnaris

origin: lateral epicondyle of humerus
insertion: fifth metacarpal
action: extends and adducts wrist

extensor pollicis Longus

origin: dorsal shaft of ulna and radius
insertion: distal thumb
action: extends thumb

extensor Pollicis brevis

origin: dorsal shaft of ulna and radius
insertion: distal thumb
action: extends thumb

Abductor pollicis longus

origin: posterior surface or radius and ulna
insertion: first metacarpal
action: abducts and extends thumb

supinator

origin: lateral epicondyle of humerus
insertion: proximal tibia
action: supinate forearm

gluteus maximus

origin: dorsal iliumm, sacrum, and coccyx
insertion: gluteal tuberosity of femur
action: powerful thigh extensor

gluteus medius

origin: lateral ilium
insertion: greater trochanter of femur
action: abducts and medially rotates thigh

ilipsoas

origin: illiac fossa and crest, lateral sacrum
insertion: lesser trochanter of femur
action: flex trunk on thigh

iliacus

origin: illiac fossa and crest, lateral sacrum
insertion: lesser trochanter of femur
action: flex trunk on thigh

psoas major

origin: illiac fossa and crest, lateral sacrum
insertion: lesser trochanter of femur
action: flex trunk on thigh

adductor Magnus

origin:ischial tuberosity “
insertion: lesser trochanteric of femur
action: adduct and medially rotates and flex thigh

adductor longus

origin:ischial tuberosity “
insertion: lesser trochanteric of femur
action: adduct and medially rotates and flex thigh

adductor brevis

origin:ischial tuberosity “
insertion: lesser trochanteric of femur
action: adduct and medially rotates and flex thigh

Gracilis

origin: inferior ramus and body of pubis
insertion: medial tibial
action:adducts thigh

Tensor fasciae latae

\

origin: illiac crest, illiac spine
insertion: iliotibial tract
action: flexes, abducts and medially rotates thigh

rectus femoris

origin: acetabulum; iliac spine
insertion: tibial tuberosity: patella
action: extends knee and flexes tight at hip

vastus lateralis

origin; greater trochanteric
insertion: tibial tuberosity
action: extends and stabilizes knee

vastus medialis

origin: interrochanteric line
insertion: tibial tuberosity
action: extends knee

vastus intermedius

origin: anterior and lateral femur
insertion: anterior and lateral femur
action: extends knee

biceps femoris

origin: ischial tuberosity "
insertion: fibula
action:extends thigh

semitendinosus

origin: ischial tuberosity
insertion: medial upper and tibial shaft
action: extends thigh

Fibularis longus

orgin: proximal fibula and distal fibula
insertion: first metatarsal
action plantar flexes and everts foot

fibularis brevis

orgin: proximal fibula and distal fibula
insertion: first metatarsal
action plantar flexes and everts foot

tibialis anterior

origin:lateral condyles of tibia
insertion: first metatarsal
action: prime mover of dorsiflexion

extensor Digitorum longus

origin: lateral condyles of tibia proximal fibula
insertion: distal phalanx
action: prime move of tie extension

extensor hallucis longus

origin: anteromedial fibula
insertion: distal phalanx
action: extends great toe

Gastronemius

origin: medial and lateral condyles of femur
insertion: calcaneus
action: plantar flexes foot when knee is extended

soleus

origin: proximal tibia and fibula
insertion: calcaneus
action: plantar flexion

popliteus

origin: lateral condyle of femur
insertion: proximal tibia
action: flexes and rotates leg medially

tibialis posterior

origin: superior tibia and fibula
insertion: medial malleolus and under arch of foot
action: prime mover of foot inversion

flexor digitorum longus

origin: Posterior tibia
insertion: Distal phalanx of great toe
action: flexes great toe

flexor hallucis longus

origin: midhsaft fibular
insertion: distal phalanx of great toe
action: flexes great toe

Semimembranosus

origin: ischial tubrosity
insertion: medial condyle of tibia
action: extends thigh

sartorius

origin: iliac spine
insertion: proximal tibia
action: flexes, abducts , and laterally rotates thigh