Lower Limb — MCQs
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Which is the largest nerve that exits the pelvis through the greater sciatic foramen?
Inversion and eversion of foot occurs at which joint
Which artery is primarily responsible for supplying the head and neck of the femur?
Which of the following statements is true about the anatomy of the great saphenous vein?
Which of the following prevents hyperextension of the thigh?
Which structure is contained within the femoral canal?
The structure which lies outside the femoral sheath is:
Superior gluteal nerve does not supply?
Which of the following muscles is not supplied by the femoral nerve?
What is the approximate length of the tibia in centimeters for an average adult?
Lower Limb Indian Medical PG Practice Questions and MCQs
Question 521: Which is the largest nerve that exits the pelvis through the greater sciatic foramen?
- A. Sciatic nerve (Correct Answer)
- B. Superior gluteal artery
- C. Inferior gluteal artery
- D. Piriformis muscle
Explanation: ***Sciatic nerve*** - The **sciatic nerve** is the largest nerve in the human body, formed from the sacral plexus, and it is indeed the largest structure that passes through the **greater sciatic foramen** as it descends into the posterior thigh. - It supplies motor and sensory innervation to the posterior thigh, lower leg, and foot. *Superior gluteal artery* - The superior gluteal artery exits the pelvis through the **greater sciatic foramen** above the piriformis muscle. - While significant, it is an artery and not a nerve, and it is not the largest structure passing through this foramen. *Inferior gluteal artery* - The inferior gluteal artery also exits the pelvis via the **greater sciatic foramen**, inferior to the piriformis muscle. - Like the superior gluteal artery, it is an arterial structure and not a nerve, and it is not the largest structure in the foramen. *Piriformis muscle* - The **piriformis muscle** originates inside the pelvis and passes through the **greater sciatic foramen** to insert on the greater trochanter of the femur. - Although it occupies a significant portion of the foramen, it is a muscle, not a nerve, and the sciatic nerve is the largest nerve exiting this aperture.
Question 522: Inversion and eversion of foot occurs at which joint
- A. Ankle
- B. Subtalar (Correct Answer)
- C. Tarso-metatarsal
- D. None of the options
Explanation: ***Subtalar*** - The **subtalar joint** (talocalcaneal joint) is primarily responsible for **inversion** and **eversion** movements of the foot. - **Inversion** involves tilting the sole of the foot medially (turning inward), while **eversion** involves tilting the sole laterally (turning outward). - This joint allows the foot to **adapt to uneven surfaces** and plays a crucial role in the biomechanics of walking and running. - The subtalar joint is essential for shock absorption and balance during gait. *Ankle* - The **ankle joint** (talocrural joint) is a hinge joint primarily responsible for **dorsiflexion** and **plantarflexion** of the foot. - It allows moving the foot up and down but has minimal contribution to inversion and eversion. *Tarso-metatarsal* - The **tarso-metatarsal joints** (Lisfranc joints) connect the tarsal bones to the metatarsal bones. - These joints contribute primarily to the **stability and arch integrity** of the foot, with minimal movement capacity. - They allow slight gliding movements but not significant inversion or eversion. *None of the options* - This option is incorrect because the **subtalar joint** is indeed the primary joint responsible for inversion and eversion of the foot. - Understanding foot joint biomechanics is essential for diagnosing gait abnormalities, ankle sprains, and foot pathologies.
Question 523: Which artery is primarily responsible for supplying the head and neck of the femur?
- A. Medial circumflex artery (Correct Answer)
- B. Obturator artery
- C. Lateral circumflex artery
- D. Profunda femoris artery
Explanation: ***Medial circumflex artery*** - The **medial circumflex artery** is the primary blood supply to the **femoral head and neck** in adults. - Its branches, particularly the **retinacular arteries**, ascend along the femoral neck to perfuse the head. *Lateral circumflex artery* - The **lateral circumflex artery** supplies the **vastus lateralis muscle** and contributes to the supply of the **greater trochanter**. - While it anastomoses with the medial circumflex artery, its direct contribution to the femoral head is minimal. *Profunda femoris artery* - The **profunda femoris artery**, or deep femoral artery, is the main arterial supply to the **thigh muscles**. - It gives rise to the medial and lateral circumflex femoral arteries but does not directly supply the femoral head. *Obturator artery* - The **obturator artery** primarily supplies the **adductor muscles** of the thigh and contributes branches to the hip joint capsule. - While it has a small branch (artery to the head of the femur) that may contribute to the femoral head in children, it is not the main source in adults.
Question 524: Which of the following statements is true about the anatomy of the great saphenous vein?
- A. Ends at the femoral vein 2.5 cm below the inguinal ligament.
- B. Ascends anterior to the medial malleolus. (Correct Answer)
- C. Starts as a continuation of the medial marginal vein.
- D. There are usually more than 5 valves below the knee.
Explanation: ***Ascends anterior to the medial malleolus.*** - The **great saphenous vein (GSV)** originates on the dorsum of the foot and passes **anterior to the medial malleolus** to ascend the medial side of the leg [1]. - This anatomical landmark is **consistently present** and crucial for identifying the vein during clinical procedures such as venous cutdown and physical examination [1]. - The GSV continues to ascend along the medial aspect of the leg and thigh to terminate at the saphenofemoral junction. *Ends at the femoral vein 2.5 cm below the inguinal ligament.* - The GSV terminates by joining the **femoral vein** at the **saphenofemoral junction** in the femoral triangle. - This junction is located approximately **3-4 cm below and lateral to the pubic tubercle**, not simply 2.5 cm below the inguinal ligament. - The precise location varies among individuals. *Starts as a continuation of the medial marginal vein.* - The GSV is formed by the union of the **dorsal vein of the great toe** and the **dorsal venous arch** of the foot. - While the **medial marginal vein** is part of the superficial venous system of the foot and contributes to the dorsal venous arch, it is not accurate to say the GSV is a direct continuation of the medial marginal vein alone. *There are usually more than 5 valves below the knee.* - While this statement might seem plausible, there is **significant individual variation** in valve numbers. - The GSV typically has **5-10 valves below the knee**, meaning some individuals have exactly 5, while others have more. - The phrase "usually more than 5" is **imprecise** and not universally true, making it an incorrect statement for exam purposes. - In contrast, the anterior position relative to the medial malleolus is a **constant anatomical feature** [1].
Question 525: Which of the following prevents hyperextension of the thigh?
- A. Ischiofemoral ligament
- B. Iliofemoral ligament (Correct Answer)
- C. Patellofemoral ligament
- D. Puboischial ligament
Explanation: ***Iliofemoral ligament*** - The **iliofemoral ligament** is the strongest ligament in the hip joint and forms an inverted Y-shape. - Its primary function is to prevent **hyperextension of the thigh** by spiraling around the femoral neck and tightening during extension. *Ischiofemoral ligament* - The **ischiofemoral ligament** is located posteriorly and prevents **over-adduction** and **internal rotation** of the hip. - It also contributes to restricting hyperextension, but is not the primary restraint compared to the iliofemoral ligament. *Patellofemoral ligament* - The **patellofemoral ligament** is located in the knee joint, connecting the patella to the femur. - It stabilizes the **patella** and helps prevent its lateral dislocation, having no role in thigh hyperextension. *Puboischial ligament* - The term **puboischial ligament** is not a standard anatomical term for a hip joint ligament that prevents hyperextension. - This option likely refers to a combination of parts of the hip bone or other ligaments without a clear function related to thigh hyperextension.
Question 526: Which structure is contained within the femoral canal?
- A. Deep inguinal lymph node (Correct Answer)
- B. Loose areolar tissue and fat
- C. Lymphatic vessels
- D. Femoral vein
Explanation: ***Deep inguinal lymph node*** - The **femoral canal** contains several structures: a **lymph node (of Cloquet or Rosenmüller)**, **lymphatic vessels**, and **loose areolar tissue**. [1] - Among these contents, the **deep inguinal lymph node** (also called the lymph node of Cloquet or Rosenmüller) is the **most clinically significant and specifically named structure**. - This lymph node is an important anatomical landmark, serving as a sentinel node that drains lymph from the lower limb, external genitalia, and perineum. - **Clinically**, it is the structure most commonly referenced when discussing femoral canal contents, particularly in the context of femoral hernias and lymphatic drainage patterns. [1] *Loose areolar tissue and fat* - While **loose areolar tissue and fat** are indeed present within the femoral canal, they are **supporting contents** rather than specifically named anatomical structures. [1] - These tissues fill the space and allow for expansion of adjacent vessels (femoral artery and vein), but they are not the primary structure of anatomical or clinical significance. - When asked about "the structure" in the femoral canal, the named lymph node is the more specific answer. *Lymphatic vessels* - **Lymphatic vessels** do traverse the femoral canal, but they are **conduits** rather than a discrete, named structure. [1] - These vessels drain lymph towards the deep inguinal lymph node (of Cloquet) located within the same canal. - The specifically named lymph node is the more definitive anatomical answer than the unnamed vessels passing through. *Femoral vein* - The **femoral vein** is located in the **intermediate compartment of the femoral sheath**, NOT within the femoral canal. - The femoral sheath has three compartments: lateral (femoral artery), intermediate (femoral vein), and medial (femoral canal). - The femoral vein lies lateral to the femoral canal, making this option clearly incorrect.
Question 527: The structure which lies outside the femoral sheath is:
- A. Genitofemoral nerve
- B. Femoral vein
- C. Femoral artery
- D. Femoral nerve (Correct Answer)
Explanation: ***Femoral nerve*** - The **femoral nerve** lies lateral to the femoral artery and is therefore situated outside the **femoral sheath**, which encloses the femoral artery, femoral vein, and lymphatic vessels [2]. - It originates from the lumbar plexus (L2-L4) and provides motor innervation to the quadriceps femoris and sensory innervation to the anterior thigh and medial leg. *Femoral artery* - The **femoral artery** is a primary content of the **femoral sheath**, occupying the most lateral compartment. - It is a continuation of the external iliac artery and is a major blood supply to the lower limb. *Femoral vein* - The **femoral vein** lies within the **femoral sheath**, positioned medial to the femoral artery. - It is the primary vein responsible for draining blood from the lower limb and eventually becomes the external iliac vein. *Genitofemoral nerve* - The **genitofemoral nerve** typically emerges on the anterior surface of the psoas major muscle and then usually divides into genital and femoral branches [1]. - While its femoral branch supplies sensory innervation to the skin over the femoral triangle, it does not course within the femoral sheath itself but rather anterior to it or outside its immediate vicinity [1].
Question 528: Superior gluteal nerve does not supply?
- A. Tensor fasciae latae
- B. Gluteus medius
- C. Gluteus minimus
- D. Gluteus maximus (Correct Answer)
Explanation: ***Gluteus maximus*** - The **gluteus maximus** muscle is primarily innervated by the **inferior gluteal nerve** (L5, S1, S2), not the superior gluteal nerve. - Its main actions include **extension** and **external rotation** of the hip. *Tensor fasciae latae* - The **tensor fasciae latae** is innervated by the **superior gluteal nerve** (L4, L5, S1). - This muscle helps in **flexion**, **abduction**, and **internal rotation** of the hip. *Gluteus medius* - The **gluteus medius** muscle receives its innervation from the **superior gluteal nerve** (L4, L5, S1). - It is a primary **abductor** and **internal rotator** of the hip, crucial for pelvic stability. *Gluteus minimus* - The **gluteus minimus** is also innervated by the **superior gluteal nerve** (L4, L5, S1). - Its functions are similar to the gluteus medius, including **abduction** and **internal rotation** of the hip.
Question 529: Which of the following muscles is not supplied by the femoral nerve?
- A. Pectineus
- B. Sartorius
- C. Vastus medialis
- D. Obturator externus (Correct Answer)
Explanation: ***Obturator externus*** - The **obturator externus** muscle is primarily supplied by the **obturator nerve** (L3-L4), which arises from the lumbar plexus, not the femoral nerve. - Its main function is the **lateral rotation of the thigh** at the hip joint. *Pectineus* - The **pectineus** muscle receives dual innervation, typically from both the **femoral nerve** (L2-L4) and the obturator nerve. - It aids in **adduction**, **flexion**, and **medial rotation** of the thigh. *Sartorius* - The **sartorius** muscle is entirely supplied by the **femoral nerve** (L2-L3). - It is responsible for **flexing, abducting, and laterally rotating the thigh** at the hip, and flexing the leg at the knee. *Vastus medialis* - The **vastus medialis** is one of the four muscles forming the quadriceps femoris group, all of which are exclusively supplied by the **femoral nerve** (L2-L4). - This muscle is crucial for **extending the leg** at the knee joint.
Question 530: What is the approximate length of the tibia in centimeters for an average adult?
- A. 30 cm
- B. 35 cm (Correct Answer)
- C. 40 cm
- D. 45 cm
Explanation: ***35 cm*** - The **tibia**, or shin bone, is the larger of the two bones in the lower leg and plays a crucial role in supporting body weight. - Its average length in adults is approximately **36-38 cm**, with **35 cm** being well within the normal range for an average adult. - Females typically have tibiae measuring **36-37 cm**, while males average **38-39 cm**. *30 cm* - A length of **30 cm** would be unusually short for an adult tibia, falling well below the normal range for average adults. - Such a short length might be associated with specific medical conditions or skeletal dysplasias. *40 cm* - A length of **40 cm** would be at the upper end or slightly above the typical average for an adult tibia. - This measurement might be seen in taller individuals, but it exceeds the average for most adults. *45 cm* - A length of **45 cm** would be comparatively long for an average adult tibia. - This measurement is significantly above average and would only be seen in very tall individuals.
Practice by Chapter
Gluteal Region and Hip
Practice Questions
Thigh and Popliteal Fossa
Practice Questions
Leg and Foot
Practice Questions
Joints of Lower Limb
Practice Questions
Nerves of Lower Limb
Practice Questions
Arterial Supply and Venous Drainage
Practice Questions
Lymphatic Drainage
Practice Questions
Muscles and Their Actions
Practice Questions
Gait Analysis and Biomechanics
Practice Questions
Applied Anatomy and Clinical Correlations
Practice Questions
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