Beginner Rectus Sheath Quiz

Q1. What is the rectus sheath?

• An aponeurotic envelope around rectus abdominis
• A synovial sheath around the hip
• A peritoneal recess behind the liver
• A fascial compartment around psoas major

Q2. Which muscle is the principal structure enclosed by the rectus sheath?

• External oblique
• Rectus abdominis
• Psoas major
• Quadratus lumborum

Q3. Which three flat abdominal muscles contribute aponeuroses to the rectus sheath?

• Rectus femoris, sartorius, and gracilis
• Diaphragm, intercostals, and serratus posterior
• External oblique, internal oblique, and transversus abdominis
• Psoas major, iliacus, and quadratus lumborum

Q4. Which fibrous structure forms the medial boundary where the right and left rectus sheaths meet?

• Linea aspera
• Linea alba
• Inguinal ligament
• Thoracolumbar fascia

Q5. Which curved line corresponds to the lateral border of the rectus sheath?

• Linea aspera
• Arcuate line
• Pectineal line
• Linea semilunaris

Q6. What is the arcuate line?

• Inferior border of the diaphragm
• Inferior limit of the posterior aponeurotic rectus sheath
• Medial edge of the iliac crest
• Superior border of the inguinal ligament

Q7. Below the arcuate line, where do the aponeuroses of the three flat abdominal muscles pass relative to rectus abdominis?

• Through the muscle belly
• Anterior to rectus abdominis
• Posterior to rectus abdominis
• Into the peritoneal cavity

Q8. Which small variable muscle may also lie within the inferior rectus sheath?

• Popliteus
• Pyramidalis
• Pectineus
• Piriformis

Q9. Which paired arteries run within the rectus sheath and supply rectus abdominis?

• Superior and inferior mesenteric arteries
• Common and proper hepatic arteries
• Renal and gonadal arteries
• Superior and inferior epigastric arteries

Q10. What is a major function of the rectus sheath?

• It encloses the kidneys
• It forms the pelvic diaphragm
• It carries the spinal cord
• It encloses rectus abdominis and transmits abdominal wall tension