Back Pain Back Pain Anatomy and Physiology 3

Question 1

Which pain receptor type in the annulus fibrosus is responsible for discogenic back pain?

Accepted Answer

Nociceptors

Answer

Nociceptors in the outer annulus fibrosus are activated by mechanical stress or inflammation, causing discogenic pain.

Question 2

The sacroiliac (SI) joint connects which two structures?

Accepted Answer

Sacrum and ilium

Answer

The SI joint is the articulation between the sacrum and the ilium of the pelvis.

Question 3

Which lumbar disc level is most commonly involved in herniation causing sciatica?

Accepted Answer

L4–L5 or L5–S1

Answer

The L4–L5 and L5–S1 disc levels are the most commonly herniated in the lumbar spine due to maximum mechanical stress.

Question 4

What is the primary function of the annulus fibrosus?

Accepted Answer

Contain the nucleus pulposus and resist torsional forces

Answer

The annulus fibrosus is the tough outer ring of the disc that contains the nucleus pulposus and resists twisting and bending forces.

Question 5

Facet joints (zygapophyseal joints) are classified as which type of joint?

Accepted Answer

Synovial joint

Answer

Facet joints are true synovial joints with articular cartilage and a synovial membrane, allowing spinal movement.

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