Appendicular Muscle Actions Flashcards
serratus anterior action
- protracts scapula (throwing a punch)
- stabilize and holds scapula flush to body wall
upper trapezius action
-elevates pectoral girdle
middle trapezius action
- retract scapula (pulls posteriorly)
- some head extension
lower trapezius action
-depress pectoral girdle
pectoralis major action
- abducts arm (downward motion)
- arm flexion
latissimus dorsi action
- arm adduction
- arm abduction/extension
- arm rotation internal/externally
teres major action
- good for fine movement and stability
- works w/ latissimus dorsi but with less force
deltoid action
- moves the humerus
- anterior : flexes
- lateral: abducts
- posterior: extends
rotator cuff supraspinatus action
-first 15° of arm abduction
rotator cuff infraspinatus action
- not powerful muscle
- adducts of arm
rotator cuff teres minor action
- adduction of the arm
- not powerful muscle
rotator cuff subscapularis action
-internal rotation and adduction of arm
biceps brachii action
-flex forearm
brachialis action
-flex forearm
brachioradialis action
- one of the reflex center
- flexes the forearm
triceps brachii action
-extensor of the forearm
supinator action
-supinates forearm
pronator teres action
- rotates forearm
- pronates
pronator quadratus action
- rotates forearm
- pronates
flexor carpi radialis action
-radial flexion
flexor carpi ulnaris action
-ulnar flexion
flexor digitorum superficialis action
-flex the fingers (digits II-V)
flexor digitorum profundus action
-flex the fingers (digits II-V)
flexor pollicis longus action
-flexes the thumb
extensor carpi radialis longus action
- helps move hand
- facilitates movement at wrist
- involved in extending and abducting the hand at wrist
extensor carpi ulnaris action
-extends and adducts at the carpus/wrist from anatomical position
extensor digitorum action
-extends digits
thenar muscles action
-moves thumb
hypothenar muscles action
-moves pinkie
lumbricals action
- flex at metacarpophalangeal joint (II-V)
- extend interphalangeal joints (II-V)
dorsal interossei action
-abduct digits
palmar interossei action
-adduct digits
iliacus action
-flex the thigh at the hip
psoas major action
-share a common tendon
tensor fascia lata action
- abducts and flexes the thigh
- pulls it anteriorly and laterally
gluteus maximus action
-thigh extension
gluteus medius action
-abduct and internally rotate thigh
adductor magnus action
-adduct and internally rotate thigh
sartorius action
- crossing the leg
- ->flexion at hip
- ->flexion at knee
- ->external rotation at hip
rectus femoris action
- extends the knee
- flexes the thigh at the hip
vastus lateralis action
- extends the knee joint
- moves the lower leg forward
vastus intermedius action
-extension of knee
vastus medialis action
- knee extension
- contributes to correct tracking of the patella
hamstrings group action
- flex the leg at the knee (opposite of the knee)
- extends thigh at the hip
tibialis anterior action
- dorsiflexion
- inversion
extensor digitorum longus action
-extends digits (II-V)
gastrocnemius action
- plantar flexes the foot at the ankle joint
- flexes the leg at the knee joint
soleus action
-plantar flexion of foot
tibialis posterior action
- invert and plantar flex
- flex digits II-V
- flex the hallux
flexor hallucis longus action
-flexes the hallux
