Which of the following among axillary lymph nodes, is a terminal group
**Core Concept**
The axillary lymph nodes are divided into three groups based on their location and drainage patterns: the pectoral (or anterior), the lateral, and the subscapular (or posterior) groups. The terminal group of axillary lymph nodes plays a crucial role in the drainage of the breast and the upper limb.
**Why the Correct Answer is Right**
The terminal group of axillary lymph nodes, also known as the apical group, is responsible for the final egress of lymph from the axilla. This group of nodes is located at the apex of the axilla, near the axillary vein and the first rib. The terminal group receives lymph from the lateral and pectoral groups and drains into the subclavian lymphatic trunk. This is an important pathway for the spread of cancer cells from the breast and the upper limb.
**Why Each Wrong Option is Incorrect**
* **Option A:** The pectoral group is an intermediate group of axillary lymph nodes, receiving lymph from the anterior chest wall and the breast. It is not a terminal group.
* **Option B:** The lateral group is also an intermediate group, receiving lymph from the upper limb and the chest wall. It is not the terminal group.
* **Option C:** The subscapular group is a primary group of axillary lymph nodes, receiving lymph from the posterior chest wall and the upper back. It is not a terminal group.
**Clinical Pearl / High-Yield Fact**
The terminal group of axillary lymph nodes is a critical site for the spread of cancer cells from the breast, and its involvement is often associated with a poor prognosis.
**Correct Answer:** C. Subscapular group