Which of the following structures is a major landmark of the sympathetic nervous system?

• A. Sympathetic chain (paravertebral ganglia)
• B. Cerebellum
• C. Corpus callosum
• D. Dorsal root ganglion

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by understanding the sympathetic nervous system, which is part of the autonomic nervous system responsible for the 'fight or flight' response. It controls involuntary functions such as heart rate, blood pressure, and pupil dilation.
2. Step 2: Identify the major anatomical structures associated with the sympathetic nervous system. The sympathetic chain, also known as the paravertebral ganglia, is a key landmark. It consists of interconnected ganglia located on either side of the vertebral column.
3. Step 3: Compare the other options provided in the question. The cerebellum is part of the brain responsible for motor coordination and balance, not directly related to the sympathetic nervous system. The corpus callosum connects the two hemispheres of the brain and facilitates communication between them, also unrelated to the sympathetic nervous system. The dorsal root ganglion contains sensory neuron cell bodies and is part of the peripheral nervous system, not specifically a landmark of the sympathetic nervous system.
4. Step 4: Recognize that the sympathetic chain (paravertebral ganglia) is the correct answer because it is directly involved in transmitting signals within the sympathetic nervous system.
5. Step 5: Conclude that understanding the anatomical and functional roles of each structure is essential for identifying the correct answer in questions related to the nervous system.