anatomy upper limb muscles (incomplete)

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Author:
awickr02
ID:
29289
Filename:
anatomy upper limb muscles (incomplete)
Updated:
2010-08-08 09:07:34
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Anatomy Upper Limb
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Description:
Basic anatomy, insertions, nerves etc of the upper limb (just started, haven't completed the arm down. Just the back muscles inserting into the humerus
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  1. Pectoralis Major (Clavicular Head)

    Origin
    Insertion
    Action
    Innervation
    • Origin: medial half of clavicle
    • Insertion: lateral lip of intertubercular sulcus (humerus)
    • Action: adducts and medially rotates humerus ( Machine fly exercise)
    • draws scapula anteriorly and inferiorly
    • clavicular head alone flexes humerus
    • Innervation:

    • lateral and medial pectoral nerves clavicular head C5, C6


















  2. Pectoralis Major (Sternocostal Head)

    Origin
    Insertion
    Action
    Innervation
    • Origin: anterior surface of sternum, costal cartilages 1-6
    • Insertion:
    • lateral lip of intertubercular sulcus
    • Action: adducts and medially rotates humerus
    • draws scapula anteriorly and inferiorly
    • sternocostal head alone extends humerus from flexed position
    • Innervation: sternocostal head C7 and C8, T1

    • 
























  3. Pectoralis Minor

    Origin
    Insertion
    Action
    Innervation
    • Origin: ribs 3-5 near Costal Cartilages
    • Insertion: Coracoid process (Not humerus)
    • Action: stabilises scapula by drawing it anteriorly and inferiorly
    • Innervation: medial pectoral nerve (C8 and T1)








  4. Subclavius

    Origin:
    Insertion:
    Action:
    Innervation:
    • Origin: junction of 1st rib and 1st costal cartilage
    • Insertion: inferior surface of middle third of clavicle
    • Action: anchors and depresses clavicle
    • Innervation: nerve to subclavius (C5 and C6)












  5. Serratus Anterior

    Origin
    Insertion
    Action
    Innervation
    • Serratus Anterior

    • Origin: lateral aspect of ribs 1-8
    • Insertion: medial border of scapula
    • Action: protract scapula,
    • rotate scapula superiorly lower fibres
    • hold scapula to thorax
    • Innervation: long thoracic nerve (C5, C6 and C7)











  6. Trapezius

    Origin:
    Insertion:
    Action:
    Innervation:
    • Origin: medial third of superior nuchal line
    • external occipital protuberance
    • nuchal ligament
    • spinous processes C7 - T12
    • Insertion: lateral third of clavicle,
    • acromion
    • spine of scapula
    • Action: descending part elevates scapula
    • ascending part depresses scapula
    • descending and ascending together rotate glenoid cavity superiorly
    • central fibres retract scapula
    • Innervation: spinal accessory nerve and C3-4








  7. Latissimus Dorsi

    Origin:
    Insertion:
    Action:
    Innervation:
    • Origin: spinous processes of T7-12, thoracolumbar fascia, iliac crest, ribs 9-12
    • Insertion: floor of intertubercular sulcus
    • Action: extends, adducts and medially rotates humerus
    • Innervation: thoracodorsal nerve (C6, C7 and C8)





  8. Levator Scapulae

    Origin:
    Insertion:
    Action:
    Innervation:
    • Origin: transverse processes of C1-C4
    • Insertion: medial border of scapula
    • Action: elevate scapula
    • rotate scapula inferiorly
    • Innervation: dorsal scapular nerve (C5), C3 and C4






  9. Rhomboid Major

    Origin
    Insertion
    Action
    Innervation
    • Origin: major: T2 - T5
    • Insertion: medial border of scapula
    • Action: retract scapula
    • rotate glenoid cavity inferiorly
    • Innervation: dorsal scapular nerve (C4 and C5)







  10. Rhomboid Minor

    Origin
    Insertion
    Action
    Innervation
    • Origin: C7 and T1
    • Insertion: medial border of scapula
    • Action: retract scapularotate glenoid cavity inferiorly
    • Innervation: dorsal scapular nerve (C4 and C5)
  11. Deltoid

    Action
    Insertion
    Action
    Innervation
    • Deltoid (there is clavicular, middle and posterior/spinal)
    • Origin: lateral third of clavicle, acromion and spine of scapula
    • Insertion: deltoid tuberosity of humerus
    • Actions:anterior fibres flex and medially rotate arm
    • posterior fibres extend and laterally rotate arm
    • all fibres are active in abduction
    • Innervation:axillary nerve (C5 and C6)


  12. Supraspinatus

    Origin
    Insertion
    Action
    Innervation
    • Origin: supraspinous fossa of scapula
    • Insertion: greater tubercle of humerus
    • Action: initiates abduction
    • maintains apposition of head of humerus and glenoid cavity during motion
    • Innervation: suprascapular nerve (C4, C5 and C6)
  13. Infraspinatus and Teres Minor

    Infraspinatus Origin:
    Teres Minor Origin
    Insertion of Both
    Action
    Innervation of Infraspinatus
    Innervation of Teres Minor
    • Infraspinatus Origin: infraspinous fossa
    • Teres Minor Origin: middle part of lateral border of scapula
    • Insertion of Both: greater tubercle of humerus
    • Action: lateral rotation of humerus
    • maintains apposition of head of humerus and glenoid cavity during motion
    • Innervation Of Infraspinatus: suprascapular nerve (C5 and C6)
    • Innervation Of Teres minor: axillary nerve (C5 and C6)





  14. Subscapularis

    Origin
    Insertion
    Action
    Innervation
    • Origin: subscapular fossa
    • Insertion: lesser tubercle of humerus
    • Action: medial rotation of humerus
    • maintains apposition of head of humerus and glenoid cavity during motion
    • Innervation: upper and lower subscapular nerves (C5, C6 and C7)





  15. Teres Major

    Origin
    Insertion
    Action
    Innervation
    • Origin: inferior angle of scapula
    • Insertion: medial lip of intertubercular sulcus of humerus
    • Actions: adducts and medially rotates humerus
    • Innervation: lower subscapular nerve (C5, C6)






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