Intermediate Sacrum Quiz

Q1. What do the transverse ridges on the pelvic surface of the sacrum represent?

• Borders of the sacroiliac joints
• Attachments of the coccygeal vertebrae
• Origins of the gluteal muscles
• Sites of fusion between sacral vertebral bodies

Q2. Which structures pass through the anterior sacral foramina?

• Anterior rami of sacral spinal nerves
• Posterior rami of sacral spinal nerves only
• Femoral nerves
• Obturator nerves only

Q3. Which structures pass through the posterior sacral foramina?

• Sciatic nerves
• Posterior rami of sacral spinal nerves
• Pudendal nerves
• Anterior rami of lumbar nerves

Q4. The median sacral crest is formed primarily by fusion of which structures?

• Costal processes
• Vertebral bodies
• Spinous processes
• Transverse processes

Q5. The intermediate sacral crests represent fusion of which vertebral structures?

• Vertebral bodies
• Spinous processes
• Articular processes
• Intervertebral discs

Q6. The lateral sacral crests are formed primarily by fusion of which structures?

• Vertebral bodies
• Articular processes
• Spinous processes
• Transverse processes

Q7. What are the sacral alae?

• Inferior projections of the coccyx
• Wing-like lateral expansions of the upper sacrum
• Fused spinous processes
• Openings for sacral nerves

Q8. What causes the sacral hiatus?

• Absence of the S1 vertebral body
• Fusion of the coccyx to the pubis
• Separation of the sacrum from the ilium
• Failure of lower sacral laminae to fuse posteriorly

Q9. Which projections flank the sacral hiatus inferiorly?

• Sacral alae
• Sacral cornua
• Ischial spines
• Pubic tubercles

Q10. Which part of the sacrum transmits body weight to the hip bones?

• Sacral alae and sacroiliac articulations
• Posterior sacral foramina only
• Sacral hiatus alone
• Coccygeal cornua