Bones together, asymmetrical forms the skeleton of the arm. Long bone diaphysis 1, 2 epiphyses.
It is structured:
- upwards, inwards and backwards with the glenoid cavity of the scapula in his head.
- bottom with the forearm by means of the distal humerus:
- down and out with the humeral capitulum radius by.
- downwards and inwards with the ulna by the humeral trochlea.
The spherical surface at the top and inside the edge projecting furthest.
General anatomical shape
- Triangular bone cut to the middle 1/3 of its shaft, he describes three sides and three edges:
- posterior, anterolateral, anteromedial face.
- anterior, medial, lateral edge.
- Head 30 mm radius representing third of a sphere.
- Neck-shaft angle of 130 °.
- Humeral lopsided 30 to 45 ° forward.
- Retroversion angle of the humeral head 20 ° to the distal humerus.
- Angle of the head relative to the horizontal: 45 °.
- greater tuberosity
- lesser tubercle
- lateral and medial epicondyle
- furrow inter tuberosity.
- Axillary nerve (C5-C6), radial (C6-C7-C8-Th1), ulnar (C8-Th1)
- Long head of biceps tendon and ligament Transverse humeral.
- Fracture at the neck: axillary nerve injury (more shoulder abduction above 8 °)
- Fracture in middle 1/3 of the diaphysis: radial nerve injury (hand gooseneck) and lesion of the brachial artery deep.
- Fracture of the medial epicondyle: ulnar nerve injury (ulnar claw)
- Synovial inflammation of the tendon of the long head of the biceps: tenosynovitis
- Dislocation of the glenohumeral: control of the axillary nerve to perfor