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Origin, Insertion & Action

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Muscle
Origin
Insertion
Actions
TRICK
Subscapularis   subscapular fossa   show medially rotates & adducts arm; help hold humeral head in glenoid cavity    
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Rectus Femoris   AIIS   base of patella via patellar ligament to tibial tuberosity   show  
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Gluteus Medius   show lateral surface of greater trochanter   abducts & medially rotates thigh; keeps pelvis level when opposite leg is raised    
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Pectoralis Major   show lateral lip of intertubercular groove of humerus   TOGETHER-> adducts & medially rotates humerus; draws scapula anteriorly & inferiorly. ALONE-> clavicular head flexes humerus & sternocostal head extends it from flexed position    
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Serratus Anterior   superior 8 or 9 ribs   show abducts scapula & rotates it upward, elevates ribs when scap stabalised    
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Quadratus Lumborum   show inferior border of 12th rib, transverse processes of L1-L4   extends & laterally flexes vert. column; fixes 12th rib during inspiration   Iliac Crest 4 QL  
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show ASIS   medial surface of tibia   flexes, abducts & laterally rotates thigh @ hip jt; flexes leg @ knee jt    
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Vastus Lateralis   greater trochanter & lateral lip of linea aspera   base of patella via patellar ligament to tibial tuberosity   show  
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show head & superior 2/3 of lateral fibula, lat condyle of tibia   base of 1st metatarsal & medial cuneiform   everts foot @ weakly plantarflexes ankle   All Peroneus Everts - SNEAKY goes under prominence on little toe  
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Extensor Digitorum longus   Lateral condyle of tibia, superior 1/3 of anterior fibula & interosseous membrane   middle & distal phalange of last 4 toes   show  
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Flexor Digitorum Longus   Medial posterior tibia inferior to soleal line   plantar aspect middal & distal phalange of last 4 toes   show  
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show ASIS & anterior part of iliac crest   iliotibial tract that attaches to lateral condyle of tibia   abducts, medially rotates & flexes thigh; steadies trunk on thigh; helps to keep ? extended    
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Vastus Medialis   show base of patella via patellar lig. to tibial tuberosity   extends knee    
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rhomboid major   transverse processes of C1-C4   medial border of scapula   show  
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Gracilis   body & inferior ramus of pubis   superior part of medial surface of tibia   show  
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Sternocleidomastoid   show Mastoid process   Uni - extends & rotates head on opp sideBilaterally - flexes neck & head & elevates sturnum during forced inhalation   Extends & rotates OPPOSITE Side  
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show Transverse Processes of C2-C7   1st & 2nd ribs   BILATERALLY raises 1st & 2nd rib; Unilaterally -laterally flexes & rotates neck on same side    
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Trapezius   medial 3rd of superior nuchal line; external occipital protuberance; nuchal ligament & sp. processes of C7 to T12 vert.   lateral 3rd of clavicle, acromion & spine of scapula   show  
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show ribs 3/4/5 near costal cartilage   coracoid process   stabilizes scapula by drawing it inferiorly & anteriorly against thoracic wall    
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Piriformis   show superior border of greater trochanter   laterally rotates extended thigh & abducts flexed thigh; steady femoral head in acetabulum    
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Splenius Capitis   show lateral aspect of mastoid process & lateral 3rd of superior nuchal line   ALONE-> laterally flexes & rotates head ipsilateral. TOGETHER-> extends head & neck    
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Gluteus Maximus   ilium posterior to posterior gluteal line, dorsal surface of sacrum, coccyx & sacrotuberous ligament   show extends thigh from flexed position; assists in lateral rotation; steadies thigh & assists in rising from seated position    
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Latissimus Dorsi   sp. processes of T7 to T12 vert.; thoracolumbar fascia, iliac crest & inferior 3 or 4 ribs   floor of intertubercular groove of humerus   extends, adducts, medially rotates humerus; raises body toward arms during climbing   show
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Semitendinosis   ischial tuberosity   medial surface of superior part of tibia   show  
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show dorsal surface of inferior angle of scapula   medial lip of intertubercular groove of humerus   adducts & medially rotates arm    
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Supraspinatus   supraspinous fossa   superior facet of greater tubercle of humerus   initiates & assists deltoid in abduction of arm & acts w/ rotator cuff muscles   show
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Deltoid   lateral 3rd of clavicle, acromion & spine of scapula   show ANTERIOR PART-> flexes & medially rotates arm. MIDDLE PART-> abducts arm. POSTERIOR PART-> extends & laterally rotates arm    
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Biceps Brachii   Short Head-> tip of coracoid process. Long Head-> supraglenoid tubercle of scapula   radial tuberosity & fascia of forearm via bicipital aponeurosis   supinates forearm & when supine, flexes forearm   show
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Brachialis   distal 1/2 of anterior surface of humerus   show flexes forearm in all positions    
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Coracobrachialis   tip of coracoid process   middle 3rd of medial surface of humerus   show  
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Brachioradialis   show lateral surface of distal ends of radius   flexes forearm    
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Gluteus Minimus   external surface of ilium & anterior & inferior gluteal lines   show abducts & medially rotates thigh; keeps pelvis level when opposite leg is raised    
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Temporalis   floor & deep fascia of temporal fossa   tip & medial surface of coronoid process of mand; anterior border of ramus of mand   elevate mandible; retract mandible   show
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Masseter   show lateral surface of ramus of mandible & coranoid process   elevates & protrudes mandible, deep fibres retrude    
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Levator Scapulae   Posterior tubercles of TVP's of C1-C4   show elevate scap, rotate scap to depress glenoid cavity    
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show superior part of lateral border of scap   inferior facet of greater tubercle of humerus   laterally rotate arm, hold humeral head in glenoid cavity    
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External Oblique   Inferior surface of last 8 ribs   iliac crest, linea alba   Compress & Support abdomenFlex & Rotate vertabral column   show
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Internal Oblique   Iliac Crest   Linea Alba, costal cartilage of last 3 ribs   show  
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Transverse Abdominis   show Xiphoid process, linea alba & pubis   Compress & Support    
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Rectus Abdominis   Pubic Crest & pubic Symphysis   Xiphoid Process, costal cartilage 5-7 ribs   show MAIN FLEXOR  
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Triceps Brachii   show olecranon process of ulna   Extend forearm, extend arm    
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Psoas Major   Transverse processes & bodies of lumbar vertabrae   Lesser Trochanter of Femur   Flexes thigh & trunkLaterally rotates thigh   show
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show ASIS   ITB attaches to lateral condyle on tibia (over knee)   flexes & abducts thigh at hipmedially rotates thigh    
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Vastus Intermedius   anterior lateral surface of femur   patella via quad tendon then tibial tuberosity via patella ligament   flexes thigh at hipextends leg at knee   show
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