Anatomical Classification of Axillary Lymph Nodes and Their Drainage Regions
Pectoral (Anterior) Group: Location and Lymphatic Drainage
The pectoral (anterior) axillary lymph nodes are vital in draining lymph from the anterior thoracic wall and lateral breast tissue, playing a critical role in immune surveillance and pathology assessment.
Anatomical Classification of Axillary Lymph Nodes and Their Drainage Regions
Pectoral (Anterior) Group: Location and Lymphatic Drainage
The axillary lymph nodes play a critical role in the lymphatic system, facilitating immune defense and fluid balance. The pectoral (anterior) group is a specific subset of axillary lymph nodes situated along the lateral border of the pectoralis minor muscle.
Location
The pectoral lymph nodes are positioned along the inferior margin of the pectoralis minor, closely associated with the lateral thoracic vessels. They serve as a crucial gateway for lymphatic drainage from superficial and deep structures of the anterior thoracic wall.
Lymphatic Drainage
The lymphatic drainage of the pectoral lymph nodes primarily includes:
- Anterior thoracic wall, including the skin and fascia.
- Most of the breast, particularly the lateral quadrant.
- Subcutaneous tissues of the upper abdominal region.
Clinical significance of the pectoral lymph nodes includes their role in the staging and progression of breast cancer, as they frequently serve as the first station for metastatic spread.
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