Muscle | Action |
Brachioradialis | Synergist to forearm flexion |
Pectoralis Major | Flex upper arm
Adducts upper arm anteriorly (across chest) |
Sternocleidomastoid | Flexes head |
Zygomaticus | Raises lateral corners of mouth (smiling muscle) |
Brachialis | Flexes forearm (pronated) <-- pouring soup out |
Orbicularis Oculi | Closes eye (winking muscle) |
Latissimus dorsi | Extends upper arm
Abducts upper arm posteriorly |
Masseter | Prime mover of jaw closure
Elevates mandible |
Trapezius | Raises or lowers shoulder
Extends head |
Soleus | Plantar flexes foot |
Orbicularis Oris | Closes lips (kissing muscle) |
Temporalis | Closes jaw, elevates and retracts mandible |
Palmaris longus | Weak wrist flexor, tenses skin and fascia of palm |
Flexor carpi radialis | Flexes wrist, abducts hand |
Extensor carpi ulnaris | Extends wrist, addicts hand |
Flexor carpi ulnaris | Flexes wrist, addicts hand |
Extensor digitorum longus | Dorsifilexes foot and extends toes |
Finularis (peroneus) | Plantar flexes and everts foot |
Tibialis anterior | Dorsiflexes and inverts foot |
Gracilis | Adducts, flexes, medially rotates thigh, flexes knee |
Pectoralis minor | With ribs fixed draws scapula forward and downward
With scapula fixed draws rib cage superiorly |
External Oblique
Internal Oblique
Transverse Abdominis | Compresses abdominal contents |
Serratus anterior | Prime mover to protract and hold scapula against chest wall |
Flexor digitorum longus | Plantar flexes and inverts foot, flexes toes |
Pronator teres | Pronates forearm |
Levator scapulae | Elevates/ adducts scapula |
Extensor carpi radials | Extends wrist, abducts hand |
Extensor digitorum | Extends fingers,wrist, abducts fingers |
Adductor Longus
Adductor femorus
Pectineus | Adducts, flexes and medially rotates thigh |
Gluteus Maximus | Extend thigh
Lateral rotation |
Gluteus Medius | Abducts and medially rotates thigh |
Sartorius | Abducts, flexes, laterally rotates thigh, flexes knee |
Tensor fascias latae | Flexes and abducts thigh, rotates thigh medially, stabilizes knee and trunk |
Semitendinosus | ORIGIN- ischial tuberosity
INSERTION-tibia
ACTION- flexes knee, extends thigh |
Biceps Femoris | ORIGIN- femur , ischium
INSERTION - tibia, fibula
ACTION - flexes knee, extends thigh |
Gastrocnemius | ORIGIN-lateral, medial condyle
INSERTION -calcaneus
ACTION -plantar flexes foot, flex knee |
Rectus abdominus | ORIGIN -pubic crest
INSERTION - ribs 5,6,7. Diploid process
ACTION -flex &rotate lumbar region |
Deltoid | ORIGIN-clavicle, scapula (acromion , spine)!
INSERTION- numerous (deltoid tuberosity)
ACTION -abducts upper arm |
Vastus lateralis
Vastus medialis
Vastus intermedius | ORIGIN - femur
INSERTION - tibial tuberosity
ACTION - extends knee |
Rectus femoris | ORIGIN-llium
INSERTION - tibial tuberosity
ACTION - flex thigh, extend knee |
Biceps brachii | ORIGIN -scapula, coracoid process
INSERTION -radial tuberosity
ACTION - flex supinated forearm (holding soup) |
Triceps brachii | ORIGIN -scapula , humerus
INSERTION -olceranon process-ulna
ACTION -extends forearm |
Semimembranosus | ORIGIN - ischial tuberosity
INSERTION -tibia
ACTION -flexes knee, extends thigh |
Rotator cuff
-supraspinatus
-infraspinatus
-teres minor
-subscapularis | ORIGIN -scapula
INSERTION -humerous-greater tubercle
ACTION - rotation of humerous-stabilizes shoulder joint, assists arm movement |