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Muscle Actions.
Anatomy
| Question | Answer |
|---|---|
| action is to elevate/depress, retract, and upwardly rotate scapula | trapezius |
| action is to retract, downward rotate scapula | rhomboids |
| action is to extend, adduct, rotate humerus | latissimus dorsi |
| flex, adduct, rotate humerus | pectoralis major |
| protracts and rotates scapula | serratus anterior |
| abduct, flex/extend arm | deltoid |
| extend, adduct, rotate humerus | teres major |
| flex and supinate forearm; LH can also flex arm | biceps brachii |
| flex forearm | brachialis |
| extend forearm | triceps brachii |
| pronate and flex forearm | pronator teres |
| flex and radial deviation | flexor carpi radialis |
| flex wrist and proximal phalanges | flexor digitorum superficialis |
| flex and ulnar deviation | flexor carpi ulnaris |
| flex wrist and distal phalanges | flexor digitorum profundus |
| flex forearm | brachioradialis |
| extends and radial deviates | extensor carpi radialis |
| extends wrist and phalanges | extensor digitorum |
| extend and ulnar deviation | extensor carpi ulnaris |
| hold head of humerus in glenoid fossa | rotator cuff |
| flex hip, flex torso | iliopsoas |
| extend, abduct thigh | gluteus maximus |
| abduct thigh(2) | gluteus medius and gluteus minimus |
| extend knee and flexes hip | rectus femoris |
| extend knee(3) | vastus lateralis, medialis, and intermedius |
| flex, abduct, laterally rotate thigh, flex knee | sartorius |
| adduct thigh, flex knee | gracilis |
| adduct, flex thigh | adductor longus |
| adduct, flex and extend thigh | adductor magnus |
| flex knee, extend thigh(3) | biceps femoris, semimembranosis, semitendinosis |
| plantar flexion, flex knee | gastrocnemius |
| plantar flexion | soleus |
| inversion and plantar flexion | tibialis posterior |
| dorsi flexion and inversion | tibialis anterior |
| eversion and plantar flexion | fibularis longus and brevis |
| elevate mandible | temporalis |
| elevate mandible; moves mandible medio-laterally | masseter |