Anatomical Classification of Axillary Lymph Nodes and Their Drainage Regions
Levels of Axillary Lymph Nodes: Classification and Clinical Relevance
The axillary lymph nodes are categorized into three levels based on anatomical positioning and clinical significance. This classification is critical in diagnosing and managing diseases like breast cancer.
Anatomical Classification of Axillary Lymph Nodes and Their Drainage Regions
Introduction
The axillary lymph nodes play a crucial role in the lymphatic drainage of the upper limb, breast, and thoracic wall. They are classified into different levels based on their anatomical location, which aids in clinical evaluation and treatment planning.
Levels of Axillary Lymph Nodes
Level I: Low Axillary Nodes
- Located lateral to the pectoralis minor muscle
- Includes the lateral, subscapular, and pectoral nodes
Level II: Mid Axillary Nodes
- Positioned beneath and posterior to the pectoralis minor muscle
- Includes the central axillary nodes
Level III: Apical Axillary Nodes
- Located medial to the pectoralis minor muscle
- Drains into the subclavian lymphatic trunk
Clinical Relevance
Axillary lymph node classification is particularly important in oncology, especially in breast cancer staging. The involvement of different levels determines disease progression and influences surgical interventions.
Conclusion
Understanding the classification of axillary lymph nodes helps clinicians accurately assess lymphatic drainage and plan effective treatments for conditions such as infections, malignancies, and immune disorders.
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