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ORIGIN, INSERTION, ACTION BILATERALLY, ACTION UNILATERALLY

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Muscle
Origin
Insertion
Action
show manubrium and medial Clavicle   Mastoid Process, superior nuchal line   rotates,extends and flexes neck  
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biceps brachii   show tuberosity of the radius   flexion of elbow, supination of forearm.long head: flexion of humerus  
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Scalenes   Transverse process of cervical vertebrae   Ribs 1 and 2   show
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Triceps Brachii   Inferior,distal margin of mandible(anterior belly)mastoid notch of long head:infraglenoid tuberclelateral head:posterior surface proximal half of humerus.medial head:posterior surface distal half of humerus.   show extension of elbow.long head: extension of humerus  
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show lateral 1/3 of clavicle, lateral acromion and spine of scapula   deltoid tuberosity of humerus   anterior:flexion, horizontal adduction, medial rotation of humerus.middle:abduction of humerus to 90 degrees.posterior-extension, horizontal abduction, lateral rotation of humerus.  
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Pectoralis Major   show greater tubercle of humerus.   all fibers: adduct and medially rotate g/h joint. assist in elevating thorax during forced inhalation.upper fibers:flex and horizontally adduct g/h joint.lower fibers: extend g/h joint  
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Latissimus Dorsi   show crest of lesser tubercle of humerus   extension, medial rotation and adduction of g/h joint.  
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show supraspinous fossa of scapula   greater tubercle of humerus   abduction of g/h joint.stabilizes head of humerus  
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Infraspinatus   infraspinous fossa of scapula   show lateral rotation, adduction, extension and horizontal abduction of g/h joint.stabilizes head of humerus.  
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Teres Minor   superior half of lateral border of scapula   greater tubercle of humerus   show
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Subscapularis   subscapular fossa of scapula   show medially rotates g/h joint.stabilizes head of humerus.  
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Levator Scapula   show upper region of medial border and superior angle of scapula.   elevation and downward rotation of scapula.laterally flexes head and neck.rotates head and neck to same side.  
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show ext. occipital protuberance, med. portion superior nuchal line, ligamentum nuchae and spinous processes C-7 thru T-12   lateral 1/3 clavicle, acromion and spine of scapula.   upper fibers:bilat- ext. head & neckunilat- lat. flex head & neck same side, rot. head & neck opp. side, elevate scap, upwardly rot. scap.middle fibers:abduct scap, stabilize scap.lower fibers:depress scap, upwardly rotate scap  
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show maj-spinous processes T-2 to T-5min- spinous processes C-7 &T-1   maj- med. border of scap from spine of scap to inferior angle.min- upper portion medial border of scap across from spine.   adduct, elevate and downwardly rotate scapwnwardly rotate scap.  
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Pectoralis Minor   3rd, 4th and 5th ribs   show depresses scap, abducts scapula, tilts scapula anteriorly and assists in forced inhalation.  
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Serratus Anterior   surfaces of upper 8 or 9 ribs   anterior surface of medial border of scapula   show
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Quadriceps(Rectus Femoris)   show tibial tuberosity   extends the knee, flexes the hip  
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Quadriceps(Vastus Group)   lateralis-lat. lip linea aspera &gluteal tuberositymedialis-medial lip linea asperaintermedius-anterior and lateral shaft of femur   show all - extend the knee  
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Hamstrings(Biceps Femoris)   long head-ischial tuberosityshort head- lateral lip of linea aspera   head of fibula   show
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Hamstrings(Semimembranosus and Semitendinosus)   ischial tuberosity   semimem- post aspect of medial condyle of tibiasemiten- prox. medial shaft of tibia and pes anserinus tendon   show
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Gastrocnemius   condyles of the femur (posterior surfaces)   calcaneus via calcaneal tendon   show
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Soleus   show calcanues via calcaneal tendon   plantarflexion of the ankle  
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Piriformis   show greater trochanter   laterally rotates hip, abducts thigh when hip is flexed.  
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Created by: sgajus
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