Lower Limb Practice Questions

Q: Which of the following muscles plays an important role in lifting the left foot off the ground while walking?

Right gluteus medius. ### Explanation The correct answer is **Right gluteus medius**. #### 1. The Underlying Concept: Pelvic Stability during Gait To lift the **left foot** off the ground (the "swing phase"), the body must balance on the **right leg** (the "stance phase"). When the left foot is raised, gravity naturally tends to pull the unsupported left side of the pelvis downward. To prevent this pelvic tilt and allow the left foot to clear the ground, the **abductors of the supporting hip** (primarily the **Right Gluteus Medius** and **Gluteus Minimus**) must contract. This contraction pulls the pelvis down on the right side, effectively counter-levering and elevating the pelvis on the left side. #### 2. Analysis of Incorrect Options * **A. Left gluteus medius:** This muscle is relaxed during the left swing phase. If it were the supporting leg (right foot lifted), the left gluteus medius would be the primary stabilizer. * **B. Left gluteus maximus:** This is the chief extensor of the hip, used for climbing stairs or rising from a sitting position; it does not provide lateral pelvic stability. * **C. Right adductor longus:** Adductors move the limb toward the midline. They do not prevent the pelvic drop required for foot clearance. #### 3. Clinical Pearls for NEET-PG * **Trendelenburg Sign:** If the right superior gluteal nerve or gluteus medius is damaged, the pelvis will drop on the **opposite (left) side** when standing on the right leg. This is a "Positive Trendelenburg Sign." * **Trendelenburg Gait (Lurching Gait):** To compensate for this drop, the patient tilts their trunk toward the **affected side** (the side they are standing on) to shift the center of gravity. * **Nerve Supply:** Both the gluteus medius and minimus are supplied by the **Superior Gluteal Nerve (L4, L5, S1)**. Injury to this nerve (e.g., via misplaced intramuscular injections) is the most common cause of this gait abnormality.

Q: Which of the following is true about the medial meniscus?

C-shaped. ### Explanation **Correct Answer: C. C-shaped** The **medial meniscus** is a fibrocartilaginous disc located within the knee joint. It is characterized by its **large, semicircular, or "C-shaped"** appearance. In contrast, the lateral meniscus is more circular (nearly a complete ring) and smaller in diameter. #### Analysis of Options: * **A. Made up of hyaline cartilage:** This is incorrect. Menisci are composed of **fibrocartilage**, which provides high tensile strength and elasticity to withstand compressive loads. Hyaline cartilage covers the articular surfaces of the bones, not the menisci themselves. * **B. Injury of the lateral meniscus is more frequent:** This is incorrect. The **medial meniscus is injured 20 times more frequently** than the lateral meniscus. This is because the medial meniscus is firmly attached to the **Medial Collateral Ligament (MCL)** and the joint capsule, making it less mobile and more prone to tearing during rotational stress. * **D. Inner part is more avascular:** While this statement is technically a physiological fact (the inner 2/3rd is avascular and the outer 1/3rd is vascular), it is often considered a general property of *both* menisci. In the context of this specific question, "C-shaped" is the definitive anatomical descriptor that distinguishes the medial from the lateral meniscus. #### NEET-PG High-Yield Pearls: * **Shape:** Medial = C-shaped; Lateral = O-shaped (Circular). * **Mobility:** The lateral meniscus is more mobile because it is not attached to the Lateral Collateral Ligament (separated by the Popliteus tendon). * **Unhappy Triad of O'Donoghue:** Simultaneous injury to the **Anterior Cruciate Ligament (ACL)**, **Medial Collateral Ligament (MCL)**, and **Medial Meniscus**. * **Blood Supply:** The peripheral "Red Zone" has a good blood supply (healing possible), while the central "White Zone" is avascular (requires excision/meniscectomy).

Q: A 42-year-old mother of three children visits the outpatient clinic complaining that her youngest son cannot walk yet. Radiographic and physical examinations reveal an unstable hip joint. Which of the following ligaments is responsible for stabilization of the hip joint in childhood?

Ligament of the head of the femur. **Explanation:** The **ligament of the head of the femur** (ligamentum teres) is a triangular, somewhat flattened band that extends from the acetabular notch to the fovea capitis of the femur. **Why it is correct:** In early childhood, the ligament of the head of the femur plays a critical role in hip stability. It contains the **acetabular branch of the obturator artery**, which is the primary blood supply to the epiphysis of the femoral head before the medial and lateral circumflex arteries fully take over this role. Damage or laxity of this ligament in a child can lead to joint instability and potential avascular necrosis. While its mechanical stabilizing role diminishes in adults, it remains a vital structure during the developmental years. **Why the other options are incorrect:** * **A, B, and C (Iliofemoral, Pubofemoral, Ischiofemoral):** These are the three major extracapsular ligaments of the hip. While they provide significant stability in adults (especially the **Iliofemoral ligament**, which is the strongest ligament in the body and prevents hyperextension), they are not the primary structures responsible for the specific developmental stability and vascular integrity required in early childhood. **High-Yield Clinical Pearls for NEET-PG:** * **Iliofemoral Ligament (Y-ligament of Bigelow):** Strongest ligament in the body; prevents hyperextension of the hip. * **Ischiofemoral Ligament:** Weakest of the three extracapsular ligaments; limits internal rotation. * **Blood Supply:** In adults, the main blood supply to the femoral head is the **medial circumflex femoral artery** (via retinacular arteries). In children, the artery within the ligamentum teres is crucial. * **Clinical Correlation:** Damage to the acetabular branch in the ligamentum teres during childhood can lead to **Legg-Calvé-Perthes disease**.

Q: Which artery supplies the gluteus medius muscle?

Superior gluteal artery. **Explanation:** The **superior gluteal artery (SGA)** is the largest branch of the internal iliac artery. It exits the pelvis through the greater sciatic foramen, passing superior to the piriformis muscle. It divides into a superficial branch (supplying the gluteus maximus) and a **deep branch**, which runs between the gluteus medius and minimus, providing the primary blood supply to both these muscles as well as the tensor fasciae latae. **Analysis of Incorrect Options:** * **Obturator artery:** A branch of the internal iliac artery that passes through the obturator canal to supply the medial compartment (adductors) of the thigh and the head of the femur via the ligamentum teres. * **Ilio-inguinal artery:** This is a distractor; the *ilio-inguinal* is a nerve (L1), not an artery. The *iliolumbar* artery exists but supplies the iliacus and psoas muscles. * **Inferior gluteal artery:** While it also exits the greater sciatic foramen (inferior to the piriformis), it primarily supplies the **gluteus maximus**, the pelvic diaphragm, and the proximal hamstrings. **High-Yield Clinical Pearls for NEET-PG:** * **The Piriformis Landmark:** The piriformis is the "key" muscle of the gluteal region. The **Superior** gluteal artery/nerve exit **above** it, while the **Inferior** gluteal artery/nerve and the **Sciatic nerve** exit **below** it. * **Trendelenburg Sign:** The superior gluteal **nerve** (which accompanies the artery) innervates the gluteus medius and minimus. Injury to this nerve leads to a positive Trendelenburg sign (pelvic tilt toward the unsupported side during walking). * **Cruciate Anastomosis:** The inferior gluteal artery participates in the cruciate anastomosis of the thigh, providing collateral circulation between the internal iliac and femoral systems.

Q: Which of the following is NOT found within the adductor canal of Hunter?

Popliteal artery. The **Adductor Canal (Hunter’s Canal)** is an aponeurotic tunnel located in the middle third of the medial thigh. It serves as a passage for structures moving from the femoral triangle to the popliteal fossa. ### Why the Popliteal Artery is the Correct Answer: The **Femoral artery** enters the adductor canal at its apex. However, it only becomes the **Popliteal artery** *after* it exits the canal through the **adductor hiatus** (an opening in the Adductor magnus muscle). Therefore, the popliteal artery is located in the popliteal fossa, not within the adductor canal itself. ### Analysis of Incorrect Options: * **Femoral Artery (A):** This is the primary vascular content of the canal. It enters superiorly and traverses the entire length of the tunnel. * **Nerve to Vastus Medialis (C):** This is the thickest muscular branch of the posterior division of the femoral nerve. It enters the canal and supplies the vastus medialis before terminating. * **Saphenous Nerve (D):** This is the longest cutaneous branch of the femoral nerve. It travels within the canal but exits by piercing the fascial roof (vastoadductor membrane) to become superficial. ### NEET-PG High-Yield Pearls: * **Boundaries:** Anterolaterally (Vastus medialis), Posteriorly (Adductor longus and magnus), and Medially/Roof (Sartorius). * **Contents:** Femoral artery, Femoral vein, Saphenous nerve, and Nerve to vastus medialis. * **Clinical Significance:** The canal is a common site for an **Adductor Canal Block**, used for regional anesthesia in knee surgeries (e.g., TKR) because it provides sensory blockade (Saphenous nerve) while sparing the motor strength of the Quadriceps (except Vastus medialis).

Q: What forms the lateral boundary of the adductor canal?

Vastus medialis. The **Adductor Canal** (also known as Hunter’s canal or the subsartorial canal) is an aponeurotic tunnel located in the middle third of the medial aspect of the thigh. Understanding its boundaries is high-yield for NEET-PG. ### **Anatomy of the Boundaries** The canal is triangular in cross-section, formed by the following: * **Anterolateral (Lateral) Boundary:** Formed by the **Vastus medialis** muscle. * **Posterior (Floor) Boundary:** Formed by the **Adductor longus** (superiorly) and **Adductor magnus** (inferiorly). * **Medial (Roof) Boundary:** Formed by the **Sartorius** muscle and the subsartorial fascia. ### **Analysis of Options** * **Vastus medialis (Correct):** It lies lateral to the femoral vessels within the canal, forming the anterolateral wall. * **Adductor longus (Incorrect):** This muscle forms part of the **posterior boundary (floor)** of the canal, not the lateral boundary. * **Rectus medialis (Incorrect):** This is a muscle of the eye (extraocular muscle). The student may confuse this with the *Gracilis* or *Vastus medialis*, but it is anatomically irrelevant to the thigh. * **Vastus lateralis (Incorrect):** This muscle is located on the far lateral aspect of the thigh and does not contribute to the boundaries of the adductor canal. ### **Clinical Pearls for NEET-PG** 1. **Contents:** The canal contains the **Femoral artery**, **Femoral vein**, **Saphenous nerve** (the longest cutaneous branch of the femoral nerve), and the **Nerve to vastus medialis**. 2. **Adductor Canal Block:** Often used in orthopedic surgery (e.g., total knee arthroplasty) to provide sensory anesthesia to the knee while sparing the motor function of the quadriceps. 3. **Termination:** The canal ends at the **Adductor hiatus** (an opening in the Adductor magnus), where the femoral vessels enter the popliteal fossa to become the popliteal vessels.

Q: What is the arrangement of structures in the upper part of the popliteal fossa from medial to lateral?

Artery - Vein - Nerve. ### Explanation The popliteal fossa is a diamond-shaped space behind the knee. The arrangement of its contents (Popliteal artery, Popliteal vein, and Tibial nerve) is a high-yield topic because their relative positions change depending on the level of the cross-section. **1. Why Option A is Correct:** In the **upper part** of the fossa, the structures are arranged from medial to lateral as **Artery – Vein – Nerve (AVN)**. * The **Popliteal Artery** is the deepest structure, lying closest to the femur. * The **Popliteal Vein** lies superficial to the artery. * The **Tibial Nerve** is the most superficial structure. As they descend, the vein and nerve cross the artery. By the **middle** of the fossa, they lie directly superficial to each other (Nerve over Vein over Artery). In the **lower part**, the arrangement reverses to **Nerve – Vein – Artery (NVA)** from medial to lateral. **2. Why Other Options are Incorrect:** * **Option B (V-A-N):** This does not occur at any level of the popliteal fossa. * **Option C (N-V-A):** This is the arrangement in the **lower part** of the fossa (medial to lateral). * **Option D (A-N-V):** This is an incorrect sequence; the vein always remains sandwiched between the artery and the nerve throughout the fossa. **3. Clinical Pearls & High-Yield Facts:** * **Deepest Structure:** The Popliteal Artery is the deepest structure in the fossa; thus, popliteal pulses are best felt by deeply compressing against the femur. * **Popliteal Aneurysm:** This is the most common peripheral artery aneurysm. Due to the proximity, it can compress the Tibial nerve, leading to sensory/motor deficits in the calf and foot. * **Baker’s Cyst:** A swelling of the semimembranosus bursa that can also compress these structures. * **Mnemonic:** Remember **"AVN"** for the **A**pex (upper part) and **"NVA"** for the base (lower part).

Q: All of the following muscles are supplied by the tibial component of the sciatic nerve except?

Short head of Biceps femoris. The sciatic nerve (L4-S3) is the largest nerve in the body and consists of two distinct components wrapped in a single connective tissue sheath: the **Tibial nerve** and the **Common Peroneal (Fibular) nerve**. **1. Why the Correct Answer is Right:** The **Short head of Biceps femoris** is the only muscle in the posterior compartment of the thigh that is **not** supplied by the tibial component. Instead, it is supplied by the **Common Peroneal component** of the sciatic nerve. This is a classic anatomical "exception" often tested in exams. **2. Why the Other Options are Incorrect:** The tibial component of the sciatic nerve supplies the "true" hamstring muscles and the hamstring part of the adductor magnus. * **Semitendinosus & Semimembranosus:** These are true hamstring muscles (originating from the ischial tuberosity) and are supplied by the tibial nerve. * **Adductor Magnus:** This is a "hybrid" or "composite" muscle. Its **hamstring part** (ischial part) is supplied by the tibial nerve, while its adductor part is supplied by the obturator nerve. **3. High-Yield Clinical Pearls for NEET-PG:** * **Hybrid Muscles of Lower Limb:** Always remember Adductor Magnus (Obturator + Tibial n.), Pectineus (Femoral + Obturator n.), and Biceps Femoris (Tibial + Common Peroneal n.). * **The "Hamstring" Definition:** To be a true hamstring, a muscle must originate from the ischial tuberosity, insert into a bone of the leg, and be supplied by the tibial nerve. The **short head of biceps femoris fails all three criteria** (originates from linea aspera, supplied by common peroneal n.). * **Sciatic Nerve Bifurcation:** The sciatic nerve typically divides into its two terminal branches at the superior angle of the popliteal fossa.

Question 1

Which of the following muscles plays an important role in lifting the left foot off the ground while walking?

Accepted Answer

Right gluteus medius

Answer

Left gluteus medius

Answer

Left gluteus maximus

Answer

Right adductor longus

Question 2

Which of the following is true about the medial meniscus?

Accepted Answer

C-shaped

Answer

Made up of hyaline cartilage

Answer

Injury of the lateral meniscus is more frequent than the medial meniscus

Answer

Inner part is more avascular

Question 3

A 42-year-old mother of three children visits the outpatient clinic complaining that her youngest son cannot walk yet. Radiographic and physical examinations reveal an unstable hip joint. Which of the following ligaments is responsible for stabilization of the hip joint in childhood?

Accepted Answer

Ligament of the head of the femur

Answer

Iliofemoral

Answer

Pubofemoral

Answer

Ischiofemoral

Question 4

Which artery supplies the gluteus medius muscle?

Accepted Answer

Superior gluteal artery

Answer

Obturator artery

Answer

Ilio-inguinal artery

Answer

Inferior gluteal artery

Question 5

Which of the following is NOT found within the adductor canal of Hunter?

Accepted Answer

Popliteal artery

Answer

Femoral artery

Answer

Nerve to Vastus medialis

Answer

Saphenous nerve

Question 6

What forms the lateral boundary of the adductor canal?

Accepted Answer

Vastus medialis

Answer

Adductor longus

Answer

Rectus medialis

Answer

Vastus lateralis

Question 7

What is the arrangement of structures in the upper part of the popliteal fossa from medial to lateral?

Accepted Answer

Artery - Vein - Nerve

Answer

Vein - Artery - Nerve

Answer

Nerve - Vein - Artery

Answer

Artery - Nerve - Vein

Question 8

All of the following muscles are supplied by the tibial component of the sciatic nerve except?

Accepted Answer

Short head of Biceps femoris

Answer

Adductor magnus

Answer

Semimembranosus

Answer

Semitendinosus

Question 9

A 23-year-old man is admitted to the emergency department with a deep, bleeding stab wound of the pelvis. After the bleeding has been arrested, an MRI examination gives evidence that the right ventral primary ramus of L4 has been transected. Which of the following problems will most likely be seen during physical examination?

Accepted Answer

Reduction or loss of sensation from the medial aspect of the leg

Answer

Loss of the Achilles tendon reflex

Answer

Weakness of abduction of the thigh at the hip joint

Answer

Inability to evert the foot

Question 10

Which of the following movements would be affected in case of paralysis of the quadriceps femoris muscle?

Accepted Answer

Extension at the knee

Answer

Adduction at the hip

Answer

Extension at the hip

Answer

Flexion at the knee

Lower Limb — MCQs

Lower Limb — MCQs

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