Lecture: Thorax and movements of the scapula

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  1. Pectoralis Minor
    Origin: anterior surfaces of ribs 3-5 (or 2-4)

    Insertion: coracoid process of scapula

    • Action: with ribs fixed, draws scapula foward and downward
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  2. Serratus anterior
    Origin:by a series of muscle slips from ribs 1-8(or9)

    Insertion: entor anterior aurface of vertebral border of scapula

    • Action: rotates scapula so that its inferior anfle moves laterally up and down, prime mover to protract and hold scpaula against chest wall
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  3. Subclavius
    Origin: constal cartilage of rib 1

    Insertion: groove on inferior surface of clavicle

    • Action: helps stabilize and depress pectoral girdle
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  4. Trapezius
    Origin: occipital bone, ligamentum nuchae, and spinous processes of C7 and all thoracic vertebrae

    Insertion: a continuous insertion along acromion and spone of scapula and lateral third of clavicle

    • action: stabilizes, raises, retracts, and rotates scapula
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  5. Levator Scapulae
    origin: transverse processes of c1-C4

    insertion: medial border of the scapula, superior to the spine

    • action: elevates/adducts scapula
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  6. Rhomboids
    Origin: spinous processe of C7 and T1 (minor) and spinous processes of T2-T5 (major)

    Insertion: medial border of scapula

    Action: Stabilizes scapula
  7. Pectoralis Major
    Muscles crossing the shoulder joint
    origin: sternal end of clavicle, sternum, cartilage of ribs 1-6 (or 7), and aponeurosis of external oblique muscle

    insertion: fibers converge to insert by a short tendon into intertubercular sulcus and greater tuberacle of humerus

    • action: prime mover of arm flexion; rotates arm medially, adducts arm
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  8. Which are the prime movers for arm movement?
    Pectoralis Major

    Latissmus Dorsi

  9. Which four muscles make up the rotator cuff?
    What are their functions?


    Teres Minor


    • They...
    • 1. reinforce the capsule of the shoulder
    • 2. act as synergists and fixators
  10. Deltoid
    Muscles crossing the shoulder joint
    Origin: embraces insertion of the treapezius, lateral third of clavicle; acrominon and spine of scapula

    Insertion: deltoid tuberosity of humerus

    • Action: prime mover of arm abduction when all its fibers contract simultaneously
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  11. Latissmus Dorsi
    Muscles crossing the shoulder joint
    Origin: indirect attachment via lumbodorsal fascia into spines of lower siz thoracic vertebrae, lumbar vertebrae, lower 3 to 4 ribs, and iliac crest; also from scapulas's inferior angle

    Insertion: spirals around teres major to insert in floor of intertubular sulcus of humerus

    • action: primse mover of arm extension; powerful arm adductor, medially rotates arm at shoulder
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  12. Subscalpularis
    Muscles crossing the shoulder joint
    Rotator Cuff
    origin: subscapular fossa of scapula

    insertion: lesser tubercle of humerus

    action: chief medial rotator of humerus
  13. Supraspinatus
    Muscles crossing the shoulder joint
    Rotator Cuff
    Origin: supraspinaous fossa of scapula

    Insertion: superior pare of greater tubercle of humerus

    Action: intiates abductions
  14. Infraspitaus
    Muscles crossing the shoulder joint
    Rotator Cuff
    Origin: infraspinous fossa of scapula

    Insertion: greater tubercle of humerus posterior to insertion of supraspinatus

    Action: rotates humerus laterally
  15. Teres Minor
    Muscles crossing the shoulder joint
    Rotator Cuff
    Origin: posterior surface of scapula at inderior angle

    Insertion: crest of lesser tubercle on anterior humerus insertion of tendon fused with that of latissmus dorsi

    Action: extends, medially rotates, and adducts humerus
  16. Coarcobrachialis
    Muscles crossing the shoulder joint
    Origin: coracoid process of scapula

    Insertion: medial surface of humerus shaft

    Action: flexion and adduction of the humerus

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Lecture: Thorax and movements of the scapula
2012-03-29 04:54:07
Lecture Thorax movements scapula

Lecture: Thorax and movements of the scapula
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