LESI LESI Anatomy and Neuroanatomy

Question 1

The epidural space in the lumbar region is located between which two structures?

Accepted Answer

The dura mater and the ligamentum flavum

Answer

The arachnoid mater and the pia mater

Answer

The periosteum and the vertebral body

Answer

The anterior longitudinal ligament and the posterior longitudinal ligament

Question 2

Which lumbar interspace is most commonly used for a caudal epidural steroid injection approach?

Accepted Answer

Sacral hiatus (S4-S5 level)

Answer

L1-L2

Answer

L3-L4

Answer

L4-L5

Question 3

The conus medullaris typically terminates at which vertebral level in adults?

Accepted Answer

L1-L2

Answer

T10-T11

Answer

L3-L4

Answer

L5-S1

Question 4

Which nerve roots form the sciatic nerve that is commonly implicated in radicular pain treated by LESI?

Accepted Answer

L4-S3

Answer

L1-L3

Answer

L2-L4

Answer

S1-S4

Question 5

The ligamentum flavum, which is traversed during interlaminar LESI, is composed primarily of which tissue?

Accepted Answer

Yellow elastic fibers

Answer

Dense irregular collagen

Answer

Elastic fibrocartilage

Answer

Hyaline cartilage

Question 6

Which structure forms the anterior boundary of the lumbar epidural space?

Accepted Answer

Posterior longitudinal ligament

Answer

Ligamentum flavum

Answer

Supraspinous ligament

Answer

Interspinous ligament