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  1. shoulder definition
    • junction of the upper limb and trunk
    • consists of scapular, deltoid and pectoral region, and the axilla
  2. Scapula
    Large, flattened, triangular bone lying on the posterolateral surface of the thorax, overlapping parts of the second to the 7th rbs
  3. Costal Surface of scapula
    • concavity, subscapular fossa
    • place for subscapularis muscle placement
  4. Dorsal surface of scapula
    • divided by spine into supraspinous and infraspinous fossa.
    • fossae are connectd laterally by the spinoglenoid notch
  5. scapular notch
    • interrupts the superior border at the base of the coracoid process.
    • Converted into a foramen by the superior transverse scapular ligament.
    • Suprascapular vessels pass over the ligament and the suprascapular nerve passes under it.
  6. lateral angle
    • pearshaped fossa - glenoid fossa
    • articulates with the rounded head of the humerus to form shoulder
  7. Supraglenoid tubercle
    • upper border of the glenoid cavity
    • attaches the longhead of the biceps
  8. Infraglenoid tubercle
    • lateral border of the scapular immediately below the glenoid cavity is the thickening.
    • Attaches the longhead of the triceps
  9. Neck of scapula
    narrow part of the scapula medial to the lateral angle
  10. Spine of the scap
    flat triangular plate projecting POST from upper part of dorsal surface. Posterior border of the spin is subcutaneous.
  11. Acromion
    projects forwards from the lateral end of the spine and forms the point of the shoulder.
  12. Angle of acromion
    Subcuatenous bony prominence posterolaterally marks the sharp forward turn of the acromion
  13. Acromioclavicular joint
    Acromion has a small, flat, oval facet that articulates with the LAT end of the clavicle to form it
  14. coracoid process
    • hooked, located medial to the upper border of the glenoid cavity, projects forward and slightly laterally
    • Attachement for the pectoralis minor, coracobrachialis and short head of the biceps
  15. Scapular articulations
    • largely suspended by muscle
    • articulates with humurus and clavicle
  16. Clavicle
    • long bone consisting of two expands ends connected by a shaft or body.
    • Extends from root of neck laterally towards the point of the shoulder
    • subcutaneous throughout
  17. sternal end of clavicle
    • enlarged quadrangular shape with a sellar-shaped articular surface
    • convex vertically and slightly concave from front to back
    • articulates with articular disc that separates it from the clavicular notch of the manubrium to form SC joint
  18. shaft of clavicle
    • slight S-shaped curve,
    • convex forwards in its medial 2/3 and concave forward in its lateral 1/3
  19. conoid tubercle
    • along the back edge of the clavicle
    • attachment of the conoid part of the coracoclavicular ligament
  20. trapezoid line
    runs with the conoid tubercle toward acromial end. attachment for the coracoclavicular ligament.
  21. Acromial end of clavicle
    flattened and has a small, flat oval facet that articulates with the medial border of the acromion at the acromioclavicular joint
  22. Clavicle development
    • ossifies before any other bone in the body
    • only bone in the limbs that is formed by intramembranous ossification
  23. clavicle motion
    acts as a strut which supports the shoulder and allows the lib to swing clear of the turnk
  24. Extrinsic muscles features / insertion points
    • not confined to the upper limb
    • arise from axial skeleton
    • insert on bones of either the pectoral girdle (scap and clavicle) or humerus
  25. Extrinsic muscles and blood supply
    • Back muscles, pectoral muscles, and serratus anterior
    • supply from subclavian and axillary arteries
  26. Intrinsic muscles of the shoulder features
    • confined entirely to the upper limb
    • arise from bones of the pectoral girdle and insert on the humerus
    • only act at shoulder joint
  27. Intrinsic muscles and supplies
    • deltoid and muscles of scapular region
    • C5, 6 through posterior division branches
    • subclavian and axillary
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Anatomy final
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