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Action of: Frontalis
Facial expressions
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Action of: Temporalis
Elevate mandible
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Action of: Masseter
Elevate mandible
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Action of: Buccinator
Compress cheeks
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Action of: Orbicularis oculi
Close eyes
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Action of: Orbicularis oris
Close lips
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Action of: Sternocleidomastoid
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Action of: Scalenes
Elevate ribs 1-12
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Action of: Erector spinae
Extend & laterally flex the vertebral column
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Action of: Splenius capitis
Extend/Hyperextend head
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Action of: Semispinalis capitus
Acting together, extend head & vertebral column
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Action of: External intercostals
Elevate rib cage during exhalation
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Action of: Internal intercostals
Flattend during inhalation
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Action of: Diaphragm
Expand thoracic cavity for inhaling
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Action of: Serratus anterior
Protract scapula
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Action of: Pectoralis minor
Pulls scapula anteriorly
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Action of: Trapezius
- Rotates, adducts, elevates, & depresses scapula
- Extend head
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Action of: Levator scapulae
Elevate scapula
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Action of: Rhomboid major & Rhomboid minor
Adduct scapula
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Action of: Pectoralis major
Flex, adduct, & rotate arm medially
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Action of: Coracobrachialis
Flex & adduct humerus
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O & I & Action of: Deltoid
- O: Acromion process & spine of scapula
- I: Deltoid tuberosity of humerus
- Action: Flex, extend, abducts, & rotate arm medially or laterally
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O & I & Action of: Supraspinatus
- O: Supraspinous fossa of scapula
- I: Greater tubercle of humerus
- Action: Assists deltoid in abducting arm
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O & I & Action of: Infraspinatus
- O: Infraspinous fossa of scapula
- I: Greater tubercle of humerus
- Action: Lateral rotation of arm
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O & I & Action of: Subscapularis
- O: Subscapular fossa of scapula
- I: Lesser tubercle of humerus
- Action: Medial rotation of arm
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O & I & Action of: Teres minor
- O: Inferior lateral border of scapula
- I: Greater tubercle of humerus
- Action: Lateral rotation of arm
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O & I & Action of: Teres major
- O: Inferior angle of scapula
- I: Intertubercular sulcus of humerus
- Action: Medial rotation of arm
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Action of: Latissimus dorsi
Medial rotation of arm
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O & I & Action of: Biceps Brachii Long head
- O: Supraglenoid tubercle
- I: Radial tuberosity of humerus
- Action: Flex & suppinate arm
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O & I & Action of: Biceps brachii short head
- O: Coracoid process
- I: Radial tuberosity of humerus
- Action: Flex & suppinate arm
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O & I & Action of: Brachialis
- O: Anterior, distal humerus
- I: Coronoid process of ulna
- Action: Flex forearm
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Action of: Brachioradialis
Flex forearm
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O & I & Action of: Triceps brachii lateral head
- O: Humerus
- I: Olecranon process of ulna
- Action: Extends forearm
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O & I & Action of: Triceps brachii Long head
- O: Inferior to glenoid cavity
- I: Olecranon process of ulna
- Action: Extend forearm
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O & I & Action of: Triceps brachii Medial head
- O: Posterior humerus
- I: Olecranon process of ulna
- Action: Extends forearm
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Action of: Superficial common flexors
Flex wrists/fingers
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Action of: Deep common flexors
Flex wrists/fingers
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Action of: Thenar group
Flex thumb
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Action of: Hypothenar group
Flex little finger
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Action of: Interossei Anterior side
Adduct fingers to middle
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Action of: Interossei Posterior side
Abduct/Spread fingers
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Action of: Lumbricals
- Flex metacarpophalangeal joints
- Extend interphalangeal joints
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Action of: Superficial common extensors
Extends wrists/fingers
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Action of: External oblique
- Flex vertebral column
- Lateral flexion
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Action of: Internal oblique
- Flex vertebral column
- Lateral flexion
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Action of: Rectus abdominis
Flexes & rotates vertebral column (sit-ups)
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Action of: Transverse abdominis
Compress abdominal contents
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Action of: Pelvic floor muscles (3)
- Support organs of the pelvic cavity
- Flex sacrum & coccyx
- Control movement of materials through the urethra & anus
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O & I & Action of: Gluteus maximus
- O: Iliac crest, sacrum, & coccyx
- I: Linea aspera & gluteal tuberosity
- Action: Extends & rotates thigh
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Action of: Gluteus medius
Abducts & rotates thigh medially
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Action of: Gluteus minimus
Abducts & rotates thigh medially
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O & I & Action of: Piriformis
- O: Antero-lateral surface of sacrum
- I: Greater trochanter of femur
- Action: Lateral rotation, abduction of thigh
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O & I & Action of: Superior gemellus
- O: Ischial spine
- I: Greater trochanter of femur
- Action: Lateral rotation, abduction of thigh
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Action of: Obturator internus
- Lateral rotation
- Abduction of thigh
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Action of: Inferior gemellus
- Lateral rotation
- Abduction of thigh
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Action of: Quadratus femoris
Lateral rotation of thigh
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O & I & Action of: Psoas major
- O: Transverse process of lumbar vertebrae
- I: Less trochanter of femur
- Action: Flexes & rotate thigh laterally
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Action of: Iliacus
Flexes & rotates thigh laterally
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O & I & Action of: Rectus femoris
- O: Anterior inferior iliac spine
- I: Patella via quadriceps tendon then tibial tuberosity via patellar ligament
- Action: Extends leg & flexes thigh
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O & I & Action of: Vastus laeralis
- O: Linea aspera
- I: Patella via quadriceps tendon then tibial tuberosity via patellar ligament
- Action: Extends leg
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O & I & Action of: Vastus intermedius
- O: Anterior femur
- I: Patella via quadriceps tendon then tibial tuberosity via patellar ligament
- Action: Extends leg
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O & I & Action of: Vastus medialis
- O: Linea aspera
- I: Patella via quadriceps tendon then tibial tuberosity via patellar ligament
- Action: Extends leg
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Action of: Tensor fascia latae
Flexes & abducts thigh
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O & I & Action of: Adductor longus
- O: Pubic symphysis
- I: Linea aspera
- Action: Adducts & rotates thigh medially
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O & I & Action of: Adductor magnus
- O: Rami of pubis & ischium
- I: Linea aspera
- Action: Adducts & rotates thigh medially
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O & I & Action of: Gracilis
- O: Pubic symphysis
- I: Proximal, medial tibia
- Action: Adducts thigh
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O & I & Action of: Sartorius
- O: Anterior, superior iliac spine
- I: Proximal, medial tibia
- Action: flexes leg, flexes thigh & rotates it laterally = crossing the legs
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O & I & Action of: Biceps femoris long head
- O: Ischial tuberosity
- I: Head of fibula & lateral condyle of tibia
- Action: Flexes leg & extends thigh
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O & I & Action of: Biceps femoris short head
- O: Linea aspera
- I: Head of fibula & lateral condyle of tibia
- Action: Flexes leg & extends thigh
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O & I & Action of: Semitendinosus
- O: Ischial tuberosity
- I: Proximal medial body tibia
- Action: Flexes leg & extends thigh
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O & I & Action of: Semimembranosus
- O: Ischial tuberosity
- I: Medial condyle of tibia
- Action: Flexes leg & extends thigh
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O & I & Action of: Tibialis anterior
- O: Lateral condyle & body of tibia
- I: 1st metatarsal & a tarsal bone
- Action: Dorsiflexes & inverts foot
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Action of: Extensor digitorum longus
- Dorsiflexes
- Everts foot
- Extends toes
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Action of: Extensor hallucis longus
- Dorsiflexes
- Inverts foot
- Extend toes
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Action of: Peroneus longus
- Plantar flexes
- Everts foot
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Action of: Peroneus brevis
- Plantar flexes
- Everts foot
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O & I & Action of: Gastrocnemius
- O: Lateral & medial condyles of femur
- I: Calcaneus via Achilles tendon
- Action: Plantar flexes foot
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O & I & Action of: Soleus
- O: Head of fibula & medial border of tibia
- I: Calcaneus by way of Achilles tendon
- Action: Plantar flexes foot
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Action of: Tibialis posterior
- Inversion
- Plantar flexion of foot
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Action of: Flexor digitorum longus
- Plantar flexion
- Inversion of foot
- Flexes toes 2-5
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Action of: Flexor hallucis longus
Flexes big toe
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