Neural-Dural Transition at the Thoracic and Lumbar Spinal Nerve Roots: A Histological Study of Human Late-Stage Fetuses

Figure 5

Thoracic and lumbar nerve roots in a fetus with a crown-rump length (CRL) of 250 mm. (a) and (b) (different sections with a 0.5-mm interval) display the left third thoracic nerve (lt T3) as well as two radicular arteries (RA) at the fourth and fifth thoracic nerve levels. (c) includes the left eleventh and twelfth thoracic nerves and a concomitant RA. In the three panels, the meningeal layer of the dura (dura) is thick, but the nerve sheath (arrow) is thin. A sheath of the dorsal root ganglion (DRG) is thin or unclear (stars). All of the panels are shown at the same magnification (scale bar in (c), 1 mm).