Orgin, Insertions & Actions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Pectoralis Major | Clavicular: medial half of the clavical. Sternocostal: sternum, 6 upper costal cartilages, apneurosis of the external oblique | lateral lip of the bicipital groove & crest below the greater tubercle of humerus | both parts adducts and medially rotates arm. Clavicular: flexes arm from full extension. Sternocostal: extends flexed arm
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| Pectoralis Minor | External surface of 3rd, 4th, 5th ribs | coracoid process of the scapula | draws scapula forward & downward, raises ribs for forced expiration
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| Subclavius | Junction of the 1st rib w/ costal cartilage | groove of the inferior surface of the clavicl | depresses clavicle&draws shoulder forward & downward
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| Trapezius | medial 3rd fo sup. nuchal line, external occipital protuberance, ligamentum nuchae,spinous processess & supraspinous lig. of C7 & T1-T12 | upper: lateral 3rd of clavicle. Middle: acromion& crest of spine of scapula. Lower: medial portion of crest of spine of scapula | upper part elevates scapula, middle: retracts scapula,. Lower: depresses scapula, upper & lower parts together rotate scapula
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| Latissimus Dorsi | Spinous processess of T7-T12, lumbar&sacral vert. supraspinal lig. & post. part of iliac crest through lumbar fascia, lower 3 or 4 ribs., infer. < of scapula. | Bottom of bicipital groove | extends,adducts & medially rotates arm
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| Levator Scapulae | Post. tubercles of transverse processess of C1-C4 | medial bord. of scapula @ and above the spine of scapula | elevates medial border of the scapula & laterally bends & rotates head
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| Rhomboid Major | spines of T2-T5 vertebrae | medial border of scapula @ and above the spine | retracts,stabilizes & elevates medial border of scapula
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| Rhomboid Minor | Spines of C7&T1 vertebrae & ligamentum nuchae | medial border of the scapula @ the root of the spine | rotates & depresses scapula to the lower lat. <
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| Serratus Anterior | outer surfaces & sup. borders of the 1st 8 or 9 ribs | Ant. surface of medial bdr. of scapula | rotates & protracts scapula
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