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Actions of Muscles
the actions of the muscles
| Question | Answer |
|---|---|
| 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
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