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2011-11-17 21:55:21
Arm humerus anatomy

From the head (of humerus) to funny bone
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  1. upper end of humerus
    • head
    • great tubercle
    • lesser tubercle
  2. Head of humerus
    • half pheroid
    • faces medially upward and backward
    • articulates with concave glenoid cavity of scap
  3. anatomical neck of humerus
    • slight constriction at margin of head
    • capsule of shoulder join is attached except medially when it descends on shaft
  4. lesser tubercel
    • project forward
    • insertion for subscapularis
  5. greater tubercle
    • laterally beyond the acromion and covered by deltoid
    • responsible for roundness of shoulder
    • insetion for supraspinatus, infraspinautes, and teres minor`
  6. crest of lesser tubercle
    insertion of teres major
  7. crest of greater tubercle
    insertion for pectoralis major
  8. intertubercular sulcus
    • separates crests
    • contains long head of biceps tendon
    • latissimus dorsi inserts into the floor
  9. transverse humerfal ligament
    stretches across the groove over the bicep tendon
  10. Shaft of humerus
    cylindrical in upper half, triangular below
  11. surgical neck
    • a tapering region where upper end joins the shaft
    • area of fracture
    • medially is the posterior humeral circumflex artery and axillary nerve
  12. deltoid tuberosity
    insertion of deltoid
  13. groove for the radial nerve
    • behind th tuberosity
    • crosses the bone obliquely, passing downwards, laterally and forwards
  14. articular lower end of humerus
    forms elbow joint with the radius and ulna
  15. humeroradial joint
    • lateral
    • rounded capitulum (little head) articulates with the head of the radius
  16. humeroulnar joint
    • Medial
    • pulley-like trochlea articulates with the trochlear notch of the ulna
  17. nonarticular lower part of the humerus
    • medial and lateral epicondyles,
    • olecranon, coronoid and radial fossae
  18. Medial epicondyle
    • subcutaneous
    • more prominent
    • superficial group of forearm flexor muscles arise from anterior surface
  19. Ulnar groove
    • ulnar nerve passes through the shallow groove behind the medial epicondyle
    • "funny bone"
  20. lateral epicondyle
    superficial group of forearm extensor muscles arise from anterior and lateral surfaces
  21. supracondylar ridges
    attachment to the medial and lateral intermuscular sept
  22. olecranon fossa
    • posterior to the trochlea
    • flarge triangular fossa for the olecranon of the ulna when elbow is extended
  23. coronoid fossa
    • anterior of trochlea and smaller the olecranon
    • for coronoid process of the ulna during flexion of the elbow
  24. radial fossa
    • directly above the capitulum anteriorly
    • for the head of the radius in full flexion of elbow
  25. Cubital fossa boundaries
    • laterally by the brachioradialis
    • medially by the pronator teres
  26. Covering of the cubital fossa
    • Deep fascia reinforced by the bicipital aponeosis
    • superficial are the lateral and medial cutaneous nerves of the forearm and cephalic basilic and median cubital vein
  27. Contents of the cubital fossa
    • (MED--> LAT)
    • median nerve, brachial artery and 2 branches, biceps tendon and radial nerve deep to the brachioradialis
  28. florr of the cubital fossa
  29. Median Nerve
    • C6-8 T1 (sometimes C5)
    • arises by two roots from the medial and lateral cords
    • 2 roots unit in axilla, lateral to axillary artery
    • crosses the brachial artery
    • medial to it in the cubital fossa
    • no branch to arm
  30. ulnar nerve runs?
    • C8-T1 (sometimes C7)
    • largest branch of medial cord
    • medial to brachial artery as far as middle of the arm where it passes behin the medial intermuscular septum into poster compartment
    • passes ulnar groove behind the medial epicondyle
    • no branch to arm
  31. musculotcutaneous runs?
    • pieces coracobrachialis, continues between biceps and brachialis, inervating them all
    • emerges at the lateral margin of th biceps above the elbow as the lateral cutaneous nerve of the forearm
  32. radial nerve runs?
    • (C5-8, T1)
    • largest branch of posterior cord
    • lies between the long head of triceps and humerus
    • then in the radial groove between the origins of the lateral and medial heads next to profunda brachii artery
    • enters the ANT compartment and passes between brachialis and brachioradialis in front of LAT epicondly
    • divides into superficial and deep branches to forearm
    • supplies triceps and anconeus
  33. brachial artery
    • direct continuation of the axillary artery
    • from lower border of the teres major to 1 inch below the crease of the elbow
    • first medial to humeru then crosses in front
  34. blood pressure
    • brachial artery is superficial for it
    • BP cuff applied near mid-arm and pulse sounds are listened for in cubital fossa
  35. Branches for brachial artery
    • profunda brachii
    • unnamed branches to biceps, brachialis coracobrachialis
    • superior and inferior ulnar collateral arteries --> anastomose around the medial epicondly with branches of the ulnar artery
    • terminal branches - ulnar and radial artery