Final answer:
The spinal cord segment mentioned is the thoracic spinal cord, defined by the presence of a lateral horn, along with posterior and anterior horns of gray matter.
Step-by-step explanation:
The section of the spinal cord mentioned in the given information is the thoracic spinal cord segment. This section is characterized by the presence of a lateral horn in addition to the posterior and anterior horns of gray matter. The thoracic region is followed by the cervical, lumbar, and sacral regions, but the specific segment discussed here is found at the thoracic level. These spinal cord sections reflect the divisions of the vertebral column and the level at which spinal nerves emerge.