Apical lymph nodes

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Apical lymph nodes are a group of lymph nodes located at the apex of the axilla (armpit). They are part of the axillary lymph nodes and play a crucial role in the lymphatic system, particularly in the drainage of lymph from the upper limb, chest wall, and breast.

Anatomy

The apical lymph nodes are situated at the highest point of the axilla, near the lateral border of the first rib and the clavicle. They are closely associated with the subclavian vein and the axillary vein. These nodes receive lymphatic drainage from the central and lateral groups of axillary lymph nodes, as well as from the pectoral lymph nodes.

Function

The primary function of the apical lymph nodes is to filter lymphatic fluid, trapping bacteria, viruses, and other foreign particles. They are also involved in the immune response by housing lymphocytes, which are essential for fighting infections. The apical lymph nodes are particularly significant in the context of breast cancer, as they are one of the first sites where cancer cells may spread.

Clinical Significance

The apical lymph nodes are often examined in cases of suspected breast cancer metastasis. Enlargement of these nodes can indicate the spread of cancer or the presence of an infection. Sentinel lymph node biopsy is a common procedure used to assess the involvement of these nodes in cancer.

Related Structures

• Axillary lymph nodes
• Central lymph nodes
• Lateral lymph nodes
• Pectoral lymph nodes
• Subclavian vein
• Axillary vein
• Lymphatic system

See Also

• Lymph node
• Lymphatic system
• Breast cancer
• Sentinel lymph node biopsy