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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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