the actions of the muscles
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| closes eyelid, aids in flow of tears across eye | orbicularis oculi (2)
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| closes lips, protudes lips as in kissing, speech | orbicularis oris (3)
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| compresses cheek against teeth, directs food between molars, retracts teeth from cheek when mouth is closing to prevent biting cheek, expels air and fluid | buccinator (4)
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| elevates corner of mouth (smile), exposes upper teeth | zygomaticus
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| opens jaw, depresses lower lip | platysma
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| closes mandible, elevation of mandible | masseter
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| closes mandible | temporalis
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| tilts head forward | sternocleidomastoid
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| elevates scapula, flexes neck laterally, retracts scapula and braces shoulder, rotates scapula | levator scapulae
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| extends and laterally flexes head, stabilizes scapula and shoulder, elevates and depresses shoulder, rotates and retracts scapula, abducts head, rotates and adducts scapula | trapezius
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| medially rotates arm, abducts arm, extend and laterally rotate arm | deltoid
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| flexes, adducts, medially rotates humerus and arm, aids in deep inspiration | pectoralis major
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| rotates scapula, depresses shoulder, raises ribs 3-5 | pectoralis minor
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| adducts and medially rotates humerus; extends the shoulder, produces backward swing of arm, pulls body forward and upward (climbing), aids in deep inspiration, sudden expiration, and prolonged forceful expiration (singing) | latissimus dorsi
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| w/deltoid abducts arm, helps stabilize shoulder | supraspinatus
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| laterally rotates humerus/arm, stabilizes shoulder, abducts arm | infraspinatus
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| rotates humerus/arm medially, stabilizes shoulder, abducts arm | subscapularis
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| rotates humerus/arm laterally, stabilizes shoulder, adducts arm | teres minor
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| extends and medially rotates humerus/arm (arm swinging), adducts arm | teres major
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| elbow flexion, shoulder flexion, flexes arm | biceps brachii
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| extends elbow/arm, adducts humerus/arm, extends forearm | triceps brachii
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| flexes and medially rotates arm, adducts arm | coracobrachialis
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| elbow flexion | brachialis
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| flexes elbow | brachioradialis
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| flexes thigh, flexes trunk at hip, balances trunk during sitting | iliopsoas
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| aids in knee and hip flexion; abducts and laterally rotates thigh | sartorius
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| flexes and medially rotates tibia at knee, adducts thigh, flexes thigh | gracilis
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| flexes and adducts thigh | pectineus
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| adducts, flexes, laterally rotates thigh | adductor brevis
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| adducts, flexes, and medially rotates thigh, flexes thigh at hip | adductor longus
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| adducts, and medially rotates thigh, extends thigh at hip | adductor magnus
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| extends knee, flexes thigh at hip, flexes trunk on hip if thigh is fixed | rectus femoris
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| extends knee | vastus lateralis, vastus intermedius, vastus medialis
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| extends knee, laterally rotates tibia, abducts and medially rotates thigh | tensor fasciae latae
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| extends thigh at hip, abducts thigh, elevates trunk after stooping, prevents trunk from pitching forward during walking and running | gluteus maximus
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| abducts and medially rotates thigh, shifts weight of feet when walking | gluteus medius
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| abducts and medially rotates thigh, shifts weight of feet when walking | gluteus minimus
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| flexes knee, extends hip/thigh, elevates trunk after stooping, laterally rotates tibia on femur when knee is flexed, laterally rotates femur when hip is extended, counteracts forward bending at hips | biceps femoris
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| flexes knee; extends thigh, medially rotates tibia on femur, medially rotates femur, counteracts forward bending at hips | semitendinosus or semimembranosus
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| plantar flexes foot, flexes knee | gastrocnemius
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| plantar flexes foot, steadies leg on ankle during standing | soleus
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| everts foot, plantar flexes foot | fibularis longus
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| stabilizes vertebral column during heavy lifting, maintains posture, compresses abdominal organs, laterally rotates trunk | external abdominal oblique or internal abdominal oblique
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| compresses abdominal contents, laterally rotates trunk | transverse abdominis
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| flexes lumbar region of vertebral column, forward bending at waist, compresses abdominal wall | rectus abdominis
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| protracts scapula, rotates scapula to elevate shoulder, abducts scapula | serratus anterior
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| elevates and protracts ribs, braking action during expiration | external intercostals
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| depress and retract ribs and expels air, used in forceful expiration | internal intercostals
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| inspiration and expiration, contracts in preparation for sneezing, coughing, etc. | diaphragm
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| extension and lateral flexion of vertebral column, extends and rotates vertebral column and head | erector spinae
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| retracts scapula and braces shoulder, fixes scapula during arm movements, adducts scapula | rhomboideus major or minor
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| dorsiflexes and inverts foot, resists backward tipping of body | tibialis anterior
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| aids in respiration, extends and abducts vertebral column | quadratus lumborum
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| extends and rotates head | splenius
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| extends and rotates head, extends adn rotates vertebral column | semispinalis
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