13.An autonomic nervous system has: A. Sense organs B. Brain and spinal cord C. Cerebral hemispheres D. Paired chain ganglia
Option D. The bilaterally symmetric sympathetic chain ganglia also called the paravertebral ganglia are located just ventral and lateral to the spinal cord. The chain extends from the upper neck down to the coccyx. There are usually 22-23 pairs of these ganglia: 3 in the cervical region, 11 in the thoracic region, 4 in the lumbar region and 4-5 in the sacral region.
