- See:
   - Blood Supply to the Humerus
   - Fractures of the Humerus

- Anatomy:
  - ossification centers
      - humeral head            - 3 months
      - greater tuberosity     - 3 years
      - lesser tuberosity       - 5 years
  - proximal humeral epiphysis:
      - fuses by 21 years
      - contribute 80% of longitudinal growth
      - epiphyseal plate:
          - irregularly  cone shaped with apex pointing superiorly, posteriorly and medially in relationship to shaft
          - configuration interlocks physis and metaphysis at the plate.
          - position of apex tends to resist axial and posterior forces.
          - thickened periosteum anchors head and tuberosities to shaft
               - anterior periosteum is thinner and weaker
               - posterior periosteum is thicker
               - ensures adequate blood supply to head by secure fixation to physis;
- Major rays of Trabeculae:
    - medial ray:
         - passes into inferomedial aspect of head
         - assists in resisting deformation by static loading
    - lateral ray:
         - passes vertically to tuberosity with second ray passing to superolateral aspect of head.
         - asists to resist static loading

The arterial vascularization of the humeral head. An anatomical study.

Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Saturday, June 23, 2012 6:54 pm