Name the numbered structures:

A : Conus medullaris

B : Cauda equina

C is the outer meninges = Dura mater

The nerves indicates at D arise from the ventral rami root of what specific nerves ? Thoracic nerves (T1-T11)

These nerves run between the ribs; what name is given to them ? Intercostal nerves

Between the buttocks is a bracket with a line. To what spinal plexus does it refer to ? Sacral plexus