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actions of mm's
actions
| Question | Answer |
|---|---|
| action of sternocleidomastoid | unilaterally- lateral flexes and rotates head to opposite side.bilaterally- flexes neck, draws sternum superiorly during inspiration. elevates chin |
| action of platysma | depresses mandible and draws lower lip laterally. draws up skin of chest |
| action of scalenus anterior, medius, and posterior | together they flex neck. acting on one side they laterally flex and rotate neck |
| action of splenius capitis,cervicis | together they extend, hyperextend head and neck. acting on one side they laterally flex, rotate head an neck |
| action of erector spinae(iliocostalis,longissimus, and spinalis) | extends,and laterally flexes vertebral column,and rotates ribs. longissimus also extends and rotates head. |
| action of transversospinalis(semispinalis,multifidi, and rotatores) | extends and rotates vertebral column. semispinalis capitis extends and rotates head |
| action of interspinales | extends vertebral column |
| action of intertransversarii | lateral flexion of vertebral column |
| action of external intercostals | draw ribs upward, increasing the volume for inspiration |
| action of internal intercostals | draw ribs downward, decreasing the volume for expiration |
| action of diaphragm | draws cntral tendon inferiorly, for inspiration |
| action of external and internal oblique | compresses abdominal contents, laterally flexes and rotates vertebral column |
| action of transverse abdominal | compresses abdomen. holds in guts |
| action of rectus abdominis | flexes vertebral column, compresses abdomen |
| action of quadratus lumborum | laterally flexes vertebral column, elevates pelvis..helps with climbing |
| action of pectoralis major | adduction of arm, assists in shoulder flexion and medially rotates arm |
| action of pectoralis minor | anteriorly tips the scapula |
| action of subclavius | steadies during movements of the shoulder girdle |
| actions of coracobrachialis | shoulder flexion |
| actions of biceps brachii | shoulder flexion, elbow flexion, helps with supination |
| actions of brachialis | flexes forearm |
| actions of upper trapezius | elevation and upward rotation |
| actions of middle trapezius | adduction of scapula |
| actions of lower trapezius | upward rotation of scapula and scapula depression |
| actions of latissimus dorsi | shoulder extension, adduction, internal rotation |
| actions of levator scapulae | elevates and downward rotation |
| actions of rhomboid major and minor | elevation, adduction and downward rotation of scapula |
| actions of serratus anterior | aBduction of arm and upward rotation |
| actions of anterior deltoid | shoulder flexion |
| actions of middle deltoid | shoulder aBduction |
| actions of posterior deltoid | shoulder extension |
| actions of supraspinatus | intitiates aBduction but cant finish it |
| actions of infraspinatus | lateral shoulder rotator |
| actions of teres minor | lateral rotation of shoulder |
| actions of subscapularis | medial rotation of humerus |
| actions of teres major | medially rotate, adduct, and extend humerus. |
| actions of triceps brachii | posterior shoulder extension. elbow extension |
| actions of anconeus | extends forearm |
| actions of pronator teres | pronates and flexes forearm |
| actions of flexor carpi radialis | flexes hand, synergist in abduction with extensor carpi radialis longus and bevis |
| actions of palmaris longus | flexes the hand |
| actions of flexor carpi ulnaris | flexes hand, synergist in adduction of hand with extensor carpi ulnaris |
| actions offlexor digitorum superficialis | flexes the middle phalanges of the fingers |
| actions of flexor digitorum profundus | flexes distal phalanges |
| actions of flexor pollicis longus | flexes the thumb |
| actions of pronator quadratus | pronates forearm and hand |
| actions of brachioradialis | flexes forearm |
| actions of extensor carpi radialis longus | extends hand, synergist in aBduction of hand with flexor carpi radialis |
| actions of extensor carpi radialis brevis | extends hand, synergist in abduction of hand with flexor carpi radialis |
| actions of extensor digitorum | extends the fingers and wrist |
| actions of extensor digiti minimi | extends 5th digit |
| actinos of extensor carpi ulnaris | extends hand, synergist in adductin of hand with flexor carpi ulnaris |
| actions of supinator | supinates the forearm |
| actions of aBductor pollicis longus | aBducts, laterally rotates and extends thumb, aBducts wrist |
| actions of extensor pollicis brevis | extends thumb and aBducts hand |
| actions of extensor pollicis longus | extends thumb |
| actions of extensor indicis | extends the index finger |
| actions of palmaris brevis | corrugates lateral skin of palm |
| actions of aBductor pollicis brevis | aBducts thumb, and moves it anteriorly (flexion). acts together with other muscles of thenar eminence to oppose thumb to other fingers |
| actions of flexor pollicis brevis | flexes mcp joint of thumb. acts with other muscles of thenar eminence to create opposition of thumb to fingers and assists in abductin and rotation of thumb |
| actions of opponens pollicis | rotates thumb into opposition with fingeres and acts together with thenar eminence muscles to oppose thumb to other fingers |
| actions of adductor pollicis | adducts thumb. forms webspace in hand |
| actions of aBductor digiti minimi | aBducts fith finger |
| actions of flexor digiti minimi brevis | flexes fifth giner at mcp joint |
| actions of oponens digiti minimi | rotates 5th metacarpal bone. assists flexor digit minimi brevvis in flexing ccarpometacarpal joint of 5th finger |
| actions of lumbricales | extend ip joints and weakly flex fingers at mcp joints |
| actions of palmar interossei(PAD) | adduct fingers toward center of 3rd finger at mcp joints |
| actions of dorsal interossei (DAB) | aBucts fingers away fro the center of the 3rd finger at mcp joints. |
| actions of psoas major | hip flexion |
| actions of iliacus | flexes femur |
| actions of pirifomis | laterally rotates femur |
| action of obturator internus | laterally rotates femur |
| action of gemellus superior | laterally rotates femur |
| actions of gemellus inferior | laterally rotates femur |
| actions of obturator externus | lateral rotation of femur |
| action of quadratus femoris | laterally rotates femur |
| action of gluteus maximus | hip extension |
| action of gluteus medius | hip aBduction |
| action of gluteus minimus | aBducts hip |
| action of tensor fasciae latae | hip aBduction |
| action of sartorius | flexes, aBducts, and laterally rotates hip |
| actions of rectus femoris | extends knee and flexes thigh. |
| actions of vastus lateralis | extends knee |
| actions of vastus medialis | knee extension |
| actions of vastus intermedius |
Created by:
babyb06
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