LESI LESI Anatomy and Neuroanatomy 2

Question 1

In the lumbar spine, the exiting nerve root at L4-L5 passes through which foramen?

Accepted Answer

L4 nerve exits at the L3-L4 foramen

Answer

L3-L4 foramen

Answer

L4-L5 foramen

Answer

L5-S1 foramen

Question 2

The cauda equina is the collection of nerve roots below the conus medullaris that float in which fluid?

Accepted Answer

Cerebrospinal fluid

Answer

Synovial fluid

Answer

Interstitial fluid

Answer

Lymphatic fluid

Question 3

Which lumbar level has the narrowest epidural space, making interlaminar injection most technically demanding there?

Accepted Answer

L5-S1

Answer

L1-L2

Answer

L2-L3

Answer

L3-L4

Question 4

The dorsal root ganglion (DRG) of a lumbar nerve root is typically located where within the neural foramen?

Accepted Answer

In the middle of the foramen

Answer

Medial (just outside the thecal sac)

Answer

At the lateral exit of the foramen

Answer

Outside the foramen entirely

Question 5

Which artery, if inadvertently injected during LESI, can cause catastrophic spinal cord ischemia?

Accepted Answer

Artery of Adamkiewicz

Answer

Anterior spinal artery

Answer

Posterior spinal artery

Answer

Iliolumbar artery

Question 6

The width of the lumbar epidural space is greatest at which location within the canal?

Accepted Answer

Posteriorly at the midline

Answer

Anteriorly at the posterior longitudinal ligament

Answer

Laterally in the lateral recesses

Answer

At the intervertebral foramen