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Sample Solution

There are actually three pairs of major veins on each side of the neck responsible for draining blood from the head and neck to larger veins leading to the heart:

1. Internal Jugular Veins:

• The largest and deepest veins in the neck.
• They drain blood from the brain, scalp, deep facial structures, and some parts of the neck.
• They join the subclavian veins near the base of the neck to form the brachiocephalic veins.

2. External Jugular Veins:

• Superficial veins visible under the skin along the sides of the neck.
• They drain blood from the scalp, external facial structures, and superficial parts of the neck.
• They join the subclavian veins directly, bypassing the brachiocephalic veins.

3. Anterior Jugular Veins:

• Smaller veins located closer to the midline of the neck.
• They drain blood from the anterior parts of the neck and face.
• They drain into the internal jugular veins or directly into the subclavian veins.

In addition to these three main pairs, smaller tributary veins connect to them to form a complex network responsible for efficient blood drainage from the head and neck region.

Full Answer Section

Here are some additional details you might find helpful:

• These veins have one-way valves to prevent blood from flowing back towards the head.
• Internal jugular veins are often used for intravenous catheters and central venous access.
• External jugular veins are easily visible and sometimes used for blood draws.
• Problems with these veins can cause swelling, pain, or blood clots.

If you need more specific information on any of these veins or their functions, please let me know!