Femoral Triangle and Nerves and Vessels of front of the thigh – Quiz

📝 Practice MCQs

Welcome to your Lower Limb – Chapter 3 – Femoral Triangle and Nerves and Vessels of front of the thigh

Which structure forms the medial boundary of the femoral ring?

Pectineus muscle

Femoral vein

Inguinal ligament

Lacunar ligament

None

Which statement regarding the femoral vein within the femoral triangle is correct?

It lies medial to the femoral artery at the base of the triangle

It lies lateral to the femoral artery throughout its course

It is located outside the femoral sheath

It accompanies the femoral nerve outside the sheath

None

Which of the following muscles does NOT contribute to the floor of the femoral triangle?

Iliacus

Adductor longus

Pectineus

Sartorius

None

During femoral artery catheterization, the artery is accessed at the midinguinal point. At this location, the femoral artery is the continuation of which vessel?

External iliac artery

Inferior epigastric artery

Common iliac artery

Internal iliac artery

None

During surgical enlargement of the femoral ring in a strangulated femoral hernia, an aberrant vessel may be injured if it courses medial to the ring. Which vessel is at risk?

Inferior gluteal artery

Aberrant obturator artery

Medial circumflex femoral artery

Superficial epigastric artery

None

The largest branch arising from the femoral artery within the femoral triangle is the:

Deep external pudendal artery

Profunda femoris artery

Superficial epigastric artery

Superficial circumflex iliac artery

None

A surgeon explores the femoral triangle and identifies a structure lying lateral to the femoral artery but outside the femoral sheath. Which structure is most likely being observed?

Femoral vein

Femoral nerve

Femoral branch of genitofemoral nerve

Lymph node of Cloquet

None

The medial compartment of the femoral sheath, a common site for femoral hernia, is known as the:

Femoral canal

Femoral ring

Saphenous opening

Adductor canal

None

A femoral hernia is most frequently encountered in adult females primarily because:

Females possess a larger femoral ring congenitally

The femoral canal is wider and femoral vessels are relatively smaller

The femoral nerve is smaller in females

The lacunar ligament is weaker in females

None

A patient presents with burning pain and numbness over the anterolateral aspect of the thigh due to compression beneath the inguinal ligament. Which nerve is affected?

Ilioinguinal nerve

Femoral nerve

Obturator nerve

Lateral cutaneous nerve of thigh

None

Time's up

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🎙️ Frequently Asked Viva Questions

Q1. Why is the femoral triangle regarded as the most important vascular access site in the lower limb?
Answer: It contains the femoral artery, femoral vein, and femoral nerve in a superficial, predictable arrangement, facilitating vascular access and nerve block.

Q2. Why is the femoral nerve located outside the femoral sheath?
Answer: It lies posterior to the fascia iliaca, whereas the femoral sheath encloses only the femoral vessels and femoral canal.

Q3. Why is the femoral canal considered a “potential space” rather than an empty canal?
Answer: It contains loose connective tissue and the deep inguinal lymph node, allowing expansion of the femoral vein during increased venous return.

Q4. Why is a femoral hernia more common in females?
Answer: Females have a wider femoral canal and relatively smaller femoral vessels, creating a larger potential space for herniation.

Q5. Why is strangulation particularly common in femoral hernia?
Answer: The rigid boundaries of the femoral ring compress the herniated bowel, rapidly compromising its blood supply.

Q6. Why should a femoral hernia be reduced in the reverse direction of its descent?
Answer: It descends downward, forward, and upward; reduction must follow the opposite path to return the sac through the femoral canal.

Q7. Why is the lacunar ligament surgically important during femoral hernia repair?
Answer: Division of the lacunar ligament may be necessary to enlarge the femoral ring, but an aberrant obturator artery may be injured.

Q8. Why does the femoral vein change its position relative to the femoral artery as it ascends?
Answer: It lies lateral in the lower adductor canal, posterior in the upper canal, posteromedial near the apex, and medial at the base of the femoral triangle.

Q9. Why is the medial circumflex femoral artery clinically more important than the lateral circumflex femoral artery?
Answer: It provides the major blood supply to the head and neck of the femur, making it crucial in femoral neck fractures.

Q10. Why is the femoral artery palpated at the midinguinal point?
Answer: At this point it lies superficially and can be compressed against the femoral head or superior pubic ramus to assess pulse or control hemorrhage.

Q11. Why is the femoral vein preferred for emergency central venous access?
Answer: It is large, superficial, easily accessible, and can be cannulated rapidly when peripheral veins are unavailable.

Q12. Why does femoral nerve injury produce marked weakness of knee extension?
Answer: The femoral nerve supplies all components of the quadriceps femoris, the primary extensor of the knee.

Q13. Why does femoral nerve injury abolish or diminish the knee-jerk reflex?
Answer: The femoral nerve forms both the afferent and efferent limbs of the patellar tendon reflex through the L2–L4 spinal segments.