Occipitofrontalis (epicranius)

Action: Raises eyebrow as when surprised

Buccinator

Action: Compresses cheeks inward as when blowing air

Zygomaticus Major

Action: Raises corner of mouth as when smiling

 Zygomaticus Minor

Action: Raises corner of mouth as when smiling

Platysma

Action: Draws angle of mouth downward as when pouting

Orbicularis Oculi

Action: Closes eyes as in blinking

 Orbicularis Oris

Action: Closes lips, protrudes lips as for kissing

Masseter

Orgin: Lower border of zygomatic arch

Insertion: Lateral surface of mandible

Action: Elevates Mandible

Temporalis

Action: Elevates Mandible

Medial Pterygoid

Orgin: Sphenoid, Palatine, and maxillary bones

Insertion: Medial surface of mandible

Action: Elevates mandible and moves it from side to side

Lateral Pterygoid

Orgin: Sphenoid Bone

Insertion: Anterior surgace of mandibular condyle

Action: Depresses and protracts mandible and moves it from side to side

Sternocleidomastioid

Orgin: Anterior surface of sternum and upper surface of clavicle

Insertion: Mastoid Process of temporal bone

Action: Pulls head to one side, flexes neck or elevates sternum

Semispinalis Capitis

Action: Extends head, bends head to one side, or extends neck

Trapezius

Orgin: Occipital bone and spines of cervical and thoracic vertebrae

Insertion: Clavicle, spine and acromion process of scapula

Action: Rotates scapula; various fibers raise scapula, pull scapula medially, or pull scapula and shoulder downward

Diaphragm

Action: Separates Thoracic cavity from the abdominal-pelvic cavity

Internal Intercostals

Action: Breath in

External intercostals

Action: Breath out

Rhomboideus Major

Retracts elevates, and rotates scapula

Pectoralis Major

Orgin: Clavicle, Sternum, and costal cartilages of upper ribs

Insertion: Intertubercular groove of humerus

Action: Flexes, adducts, and rotates arm medially

Latissimus Dorsi

Orgin: Spines of sacral, lumbar, and lower thoracic vertebrae, iliac crest, and lower ribs

Insertion: Intertubercular groove of humerus

Action: Extends, Adducts, and rotates the arm 

 medially, or pulls the shoulder downward and back

Deltoid

Orgin: Acromion process, spine of the scapula, and the clavical

Insertion: Deltoid tuberosity of humerus

Action: Abducts, extends,and flexes arm

Subscapularis

Action: Rotates Arm Medially

Teres Minor

Action: Rotates arm laterally

Biceps Brachii

Orgin: Coracoid process and tubercle above glenoid cavity of scaplula

Insertion: Radial tuberosity of radius

Action: Flexes forearm at elbow and rotates hand laterally

Brachialis

Flexes forearm at elbow

Supinator

Rotates forearm laterally 

Pronator Teres

Rotates arm Medially

Triceps Brachii

Orgin: Tubercle below glenoid cavity and lateral and medial surfaces of humerus

Insertion: Olecranon process of ulna

Action: Extends forearm at elbow

Flexor carpi radialis

Action:Flexes wrist and abducts hand

Flexor carpi ulnaris

Action:Flexes wrist and adducts hand

Flexor digitorum profundus

Action:Flexes distal joints of fingers

Flexor digitorum superficialis

Action: Flexes fingers and wrists

Extensor Carpi radialis longus

Action:Extends wrists and abducts hand

Extensor carpi radialis brevis

Action: Extends Wrist and Adducts hand

 Extensor carpi ulnaris

Action:Extends wrists and adducts hand

Extensor digitorum

Action:  Extends Fingers

External oblique

Action:Tenses abdominal wall and compresses abdominal contents

Internal Oblique

Action: Tenses abdominal wall and compresses abdominal contents

Rectus abdominus

Orgin:Crest of pubis and symphysis pubis

Insertion:  Xiphiod process of sternum and costal cartilages

Action: Tenses abdominal wall and compresses abdominal contents also flexes vertebral column

Transverse Abdominus

Orgin:Costal cartilages of lower ribs, processes of lumbar vertebrae, lip of iliac crest and inguinal ligament

Insertion:Linea alba and crest of pubis

Action: Tenses abdominal wall and compresses abdominal contents

Gluteus maximus

 Orgin:Sacrum, coccyx and posterior surface of ilium

Insertion: Posterior surface of femur and fascia of thigh

Action: Extends thigh at hip

Gracilis

Action: Adducts thigh, flexes leg at the knee

Adductor Magnus

Action: Adducts thigh, posterior portion extends and anterior portion flexes thigh

Adductor Longus

Action: Adducts, flexes and rotates thigh laterally

Biceps femoris

Orgin:Ischial tuberosity and linea aspera of femur

Insertion: Head of fibula and lateral condyle o tibia

Action: Flexes and rotates leg laterally and extends thigh

Semitendinosus

Orgin: Ischial tuberosity

Insertion: Medial surface of tibia

Action: Fleses and rotates leg medially and extends thigh

Semimembranosus

Orgin: Ischial tuberosity

Insertion: Medial condyle of tibia

Action: Flexes and rotates leg medially and extends thigh

Sartorius

Orgin: Anterior superior iliac spine

Insertion: Medial surface of tibia

Action: Flexes leg and thigh, abducts and rotates thigh laterally

Rectus femoris

Orgin: Spine of ilium and margin of acetabulum

Insertion: Patella by common tendon, which continues as patellar ligament to tibial tuberosity

Action: Extends leg at knee

Vastus lateralis

Orgin: Greater trochanter and posterior surface of femur

Insertion: Patella by common tendon, which continues as patellar ligament to tibial tuberosity

Action: Extends leg at knee

Vastus medialis

Orgin: Medial surface of femur

Insertion: Patella by common tendon, which continures as patellar ligament to tibial tuberosity

Action:Extends leg at knee

Vastus intermedius

Orgin: Anterior and lateral surfaces of femur

Insertion: Patella by common tendon, which continues as patellar ligament to tibial tuberosity

Action: Extends leg at Knee

Tibialis Anterior

Action:Dorsiflxion and inversion of foot

Gastrocnemius

Orgin: Lateral and media condyles of femur

Insertion: Posterior surface of calcaneus

Action: Plantar flexion of foot and flexion of leg at knee

Soleus

Orgin: Head and shaft of fibula and posterior surface of tibia

Insertion:  Posterior surface of calcaneus

Action: Plantar flexion of foot