AEMCA Practice Exam

Which lymph nodes are notably involved in the drainage of the upper limbs?

1. Inguinal nodes

2. Cervical nodes

3. Axillary nodes

4. Pelvic nodes

The correct answer is: Axillary nodes

The axillary nodes play a crucial role in the drainage of the upper limbs. They are located in the armpit area and serve as the primary collection points for lymphatic fluid from the arm, shoulder, and parts of the breast. The lymphatic system works by transporting lymph—a fluid containing white blood cells and other substances—through a network of vessels and nodes, ultimately returning it to the bloodstream. When lymph from the upper limbs accumulates, it is funneled through the brachial, lateral, and medial lymphatic vessels that lead to the axillary nodes. This filtering process is essential for a healthy immune response, as the axillary nodes trap pathogens and potentially harmful substances, allowing immune cells to respond appropriately. In contrast, the other lymph node groups mentioned serve different regions of the body. Inguinal nodes are primarily responsible for lymph drainage from the lower limbs and genital areas. Cervical nodes deal with lymphatic drainage from the head and neck. Pelvic nodes generally manage lymph from the pelvic organs. Each of these node groups is essential for their respective anatomical regions but does not play a significant role in draining lymph from the upper limbs.