The Spinal Cord Section Observed at the Level of T2

Description

Centered within the thoracic spinal cord at T2, the H shaped substantia grisea forms slender posterior (dorsal) and anterior (ventral) horns around the canalis centralis, with a distinct anterior median fissure and posterior median sulcus defining the ventral and dorsal midlines. Lateral to the gray matter, the substantia alba expands into dorsal, lateral, and ventral funiculi, the lateral columns proportionally prominent at this level. Small lateral horns (intermediolateral cell columns) are expected in the upper thoracic segments and sit between the posterior and anterior horns, just medial to the lateral funiculus. A thin rim of white matter encircles the cord surface toward the pia. T2 is a teaching sweet spot for recognizing how gray and white matter proportions change by level, and why thoracic segments look “white matter heavy” compared with the cervical enlargement. The intermediolateral cell column here contains preganglionic sympathetic neurons, the substrate for lesions that produce ipsilateral Horner syndrome when descending sympathetic pathways are interrupted above T1 to T2, and for autonomic dysregulation when the segment itself is damaged. Clinically, this cross section also supports localization in acute myelopathy, where dorsal column dysfunction (vibration and proprioception loss) contrasts with anterolateral system injury (pain and temperature loss) in patterns such as posterior spinal artery ischemia or compressive thoracic spondylotic myelopathy. Use this plate in neuroanatomy and spinal cord localization modules to contrast thoracic morphology with cervical and lumbosacral enlargements, and to annotate major tracts by funiculus for exam prep and atlas figures. It also fits neurology and neurosurgery teaching on transverse myelitis, Brown Sequard syndrome, and sympathetic pathway anatomy relevant to apical lung tumors and upper thoracic trauma. Anatomical accuracy verified by SciePro's Medical Advisory Board.