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Actions of Muscles

the actions of the muscles

closes eyelid, aids in flow of tears across eye orbicularis oculi (2)
closes lips, protudes lips as in kissing, speech orbicularis oris (3)
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)
elevates corner of mouth (smile), exposes upper teeth zygomaticus
opens jaw, depresses lower lip platysma
closes mandible, elevation of mandible masseter
closes mandible temporalis
tilts head forward sternocleidomastoid
elevates scapula, flexes neck laterally, retracts scapula and braces shoulder, rotates scapula levator scapulae
extends and laterally flexes head, stabilizes scapula and shoulder, elevates and depresses shoulder, rotates and retracts scapula, abducts head, rotates and adducts scapula trapezius
medially rotates arm, abducts arm, extend and laterally rotate arm deltoid
flexes, adducts, medially rotates humerus and arm, aids in deep inspiration pectoralis major
rotates scapula, depresses shoulder, raises ribs 3-5 pectoralis minor
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
w/deltoid abducts arm, helps stabilize shoulder supraspinatus
laterally rotates humerus/arm, stabilizes shoulder, abducts arm infraspinatus
rotates humerus/arm medially, stabilizes shoulder, abducts arm subscapularis
rotates humerus/arm laterally, stabilizes shoulder, adducts arm teres minor
extends and medially rotates humerus/arm (arm swinging), adducts arm teres major
elbow flexion, shoulder flexion, flexes arm biceps brachii
extends elbow/arm, adducts humerus/arm, extends forearm triceps brachii
flexes and medially rotates arm, adducts arm coracobrachialis
elbow flexion brachialis
flexes elbow brachioradialis
flexes thigh, flexes trunk at hip, balances trunk during sitting iliopsoas
aids in knee and hip flexion; abducts and laterally rotates thigh sartorius
flexes and medially rotates tibia at knee, adducts thigh, flexes thigh gracilis
flexes and adducts thigh pectineus
adducts, flexes, laterally rotates thigh adductor brevis
adducts, flexes, and medially rotates thigh, flexes thigh at hip adductor longus
adducts, and medially rotates thigh, extends thigh at hip adductor magnus
extends knee, flexes thigh at hip, flexes trunk on hip if thigh is fixed rectus femoris
extends knee vastus lateralis, vastus intermedius, vastus medialis
extends knee, laterally rotates tibia, abducts and medially rotates thigh tensor fasciae latae
extends thigh at hip, abducts thigh, elevates trunk after stooping, prevents trunk from pitching forward during walking and running gluteus maximus
abducts and medially rotates thigh, shifts weight of feet when walking gluteus medius
abducts and medially rotates thigh, shifts weight of feet when walking gluteus minimus
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
flexes knee; extends thigh, medially rotates tibia on femur, medially rotates femur, counteracts forward bending at hips semitendinosus or semimembranosus
plantar flexes foot, flexes knee gastrocnemius
plantar flexes foot, steadies leg on ankle during standing soleus
everts foot, plantar flexes foot fibularis longus
stabilizes vertebral column during heavy lifting, maintains posture, compresses abdominal organs, laterally rotates trunk external abdominal oblique or internal abdominal oblique
compresses abdominal contents, laterally rotates trunk transverse abdominis
flexes lumbar region of vertebral column, forward bending at waist, compresses abdominal wall rectus abdominis
protracts scapula, rotates scapula to elevate shoulder, abducts scapula serratus anterior
elevates and protracts ribs, braking action during expiration external intercostals
depress and retract ribs and expels air, used in forceful expiration internal intercostals
inspiration and expiration, contracts in preparation for sneezing, coughing, etc. diaphragm
extension and lateral flexion of vertebral column, extends and rotates vertebral column and head erector spinae
retracts scapula and braces shoulder, fixes scapula during arm movements, adducts scapula rhomboideus major or minor
dorsiflexes and inverts foot, resists backward tipping of body tibialis anterior
aids in respiration, extends and abducts vertebral column quadratus lumborum
extends and rotates head splenius
extends and rotates head, extends adn rotates vertebral column semispinalis
Created by: nicky110289