Lower Limb — MCQs

A patient with severe atherosclerosis of the external iliac artery and adjacent femoral artery is scheduled for coronary artery bypass surgery. The surgeon decides to use a long, mostly unbranched muscular vein found on the medial aspect of the leg both above and below the knee. Through which of the following structures does this vein pass to eventually join the femoral vein?

Q289Medium

All of the following statements regarding menisci are true except?

Q290Easy

Which of the following statements is true regarding the Peroneus longus muscle?

Lower Limb Indian Medical PG Practice Questions and MCQs

Question 281: Which muscle is primarily responsible for the action of moving from a sitting to a standing position?

A. Gluteus medius
B. Gluteus maximus (Correct Answer)
C. Gluteus minimus
D. Tensor fascia lata

Explanation: **Explanation:** The action of moving from a sitting to a standing position requires powerful **extension of the hip joint** against gravity. **Why Gluteus Maximus is correct:** The **Gluteus maximus** is the largest and most powerful muscle in the human body. While it is relatively relaxed during quiet standing or walking on level ground, it is recruited during activities requiring high force, such as climbing stairs, running, and **rising from a seated position**. It acts as the primary extensor of the hip, pulling the pelvis backward and upward over the femur. **Why the other options are incorrect:** * **Gluteus medius and minimus (Options A & C):** These muscles are primarily **abductors** of the hip. Their most critical role is stabilizing the pelvis during the "swing phase" of walking to prevent the opposite side of the pelvis from sagging (Trendelenburg sign). * **Tensor fascia lata (Option D):** This muscle helps in flexing, abducting, and medially rotating the hip, but it lacks the power required for the explosive extension needed to stand up. **NEET-PG High-Yield Pearls:** * **Innervation:** Gluteus maximus is supplied by the **Inferior Gluteal Nerve (L5, S1, S2)**. Damage to this nerve results in difficulty climbing stairs or standing up from a chair. * **Insertion:** Its superficial fibers insert into the **Iliotibial tract**, while deep fibers insert into the **gluteal tuberosity** of the femur. * **Clinical Sign:** A "Gluteus Maximus Lurch" occurs when the trunk is thrown backward during the heel-strike phase of gait to compensate for weak hip extension.

Question 282: Which of the following statements about the iliotibial tract is incorrect?

A. It receives the insertion of the gluteus maximus.
B. It is derived from the fascia lata.
C. It inserts on the lateral tibial condyle.
D. All of the above statements are correct. (Correct Answer)

Explanation: The **iliotibial tract (ITT)** is a longitudinal fibrous reinforcement of the **fascia lata** (the deep fascia of the thigh). Understanding its attachments and function is high-yield for NEET-PG anatomy. ### **Detailed Explanation** 1. **Origin and Derivation (Option B):** The ITT is a thickened lateral portion of the fascia lata. It extends from the iliac crest (specifically the tubercle of the iliac crest) down to the knee. 2. **Muscular Insertions (Option A):** Two major muscles insert into the ITT: * **Gluteus Maximus:** Approximately 3/4th (the superficial fibers) of this muscle inserts into the posterior aspect of the ITT. * **Tensor Fasciae Latae (TFL):** This muscle inserts into the anterior aspect of the ITT. Together, these muscles pull on the tract to stabilize the hip and knee. 3. **Distal Insertion (Option C):** The tract descends on the lateral side of the thigh and inserts onto a distinct facet on the **lateral condyle of the tibia**, known as **Gerdy’s tubercle**. Since all three statements (A, B, and C) are anatomically accurate, **Option D** is the correct choice. ### **Clinical Pearls for NEET-PG** * **Gerdy’s Tubercle:** Frequently asked in exams as the specific insertion point of the ITT on the tibia. * **ITT Syndrome:** A common overuse injury in runners caused by friction of the tract against the **lateral femoral epicondyle** during repetitive flexion and extension. * **Function:** The ITT acts as a dynamic stabilizer of the lateral knee joint and helps maintain the upright posture by steadying the pelvis on the femur. * **Nerve Supply:** The muscles associated with the tract are supplied by the **Superior Gluteal Nerve** (TFL) and **Inferior Gluteal Nerve** (Gluteus Maximus).

Question 283: The deep peroneal nerve supplies which of the following structures?

A. 1st web space of the foot (Correct Answer)
B. 5th web space of the foot
C. Anterolateral dorsum of the foot
D. Lateral part of the leg

Explanation: The **Deep Peroneal Nerve (DPN)**, a terminal branch of the Common Peroneal Nerve, is primarily the nerve of the anterior compartment of the leg. While it provides motor innervation to the dorsiflexors of the foot and extensors of the toes, its **sensory distribution is highly localized and specific.** ### **Explanation of Options:** * **Option A (Correct):** The DPN terminates by dividing into medial and lateral branches on the dorsum of the foot. The **medial terminal branch** provides cutaneous sensation to the **skin of the 1st interdigital cleft (web space)** and the adjacent sides of the great toe and second toe. This is a classic "high-yield" anatomical fact. * **Option B:** The 5th web space and the lateral border of the foot are supplied by the **Sural nerve**. * **Option C:** The majority of the anterolateral dorsum of the foot is supplied by the **Superficial Peroneal Nerve**, which is the nerve of the lateral compartment of the leg. * **Option D:** The lateral part of the leg is supplied by the **Lateral Sural Cutaneous nerve** (upper part) and the **Superficial Peroneal nerve** (lower part). ### **Clinical Pearls for NEET-PG:** * **Anterior Tarsal Tunnel Syndrome:** Compression of the Deep Peroneal Nerve under the inferior extensor retinaculum leads to pain on the dorsum of the foot and sensory loss specifically in the **1st web space**. * **Foot Drop:** Injury to the Common Peroneal Nerve (at the neck of the fibula) affects both the Deep and Superficial branches, leading to loss of dorsiflexion (Deep) and eversion (Superficial). * **Motor Supply:** Remember the DPN supplies the "Extensor Digitorum Brevis" on the dorsum of the foot—the only muscle in that region.

Question 284: A direct lateral blow to the knee results in a fracture in the intercondylar area. Which of the following structures is most likely to be injured?

A. Medial Collateral Ligament (MCL)
B. Anterior Cruciate Ligament (ACL) (Correct Answer)
C. Lateral Collateral Ligament (LCL)
D. Menisci

Explanation: **Explanation:** The **Anterior Cruciate Ligament (ACL)** is the correct answer because of its specific anatomical attachment within the **intercondylar area** of the tibia. The ACL originates from the anterior part of the intercondylar area of the tibia and extends superiorly, posteriorly, and laterally to attach to the lateral condyle of the femur. A direct lateral blow to the knee (valgus stress) often forces the tibia to slide anteriorly or rotate excessively relative to the femur, leading to an avulsion or tear specifically at its intercondylar attachment site. **Analysis of Options:** * **Medial Collateral Ligament (MCL):** While a lateral blow (valgus stress) frequently tears the MCL, it is an **extracapsular** ligament located on the medial aspect of the joint, not in the intercondylar area. * **Lateral Collateral Ligament (LCL):** This is injured by a medial blow (varus stress). Like the MCL, it is located on the exterior side of the joint. * **Menisci:** These are fibrocartilaginous structures located on the peripheral articular surfaces of the tibial plateaus, not within the central intercondylar notch. **Clinical Pearls for NEET-PG:** * **O’Donoghue’s Triple (Unhappy Triad):** A severe lateral blow often results in a concomitant injury to the **ACL, MCL, and Medial Meniscus** (though recent studies suggest the Lateral Meniscus is more commonly injured in acute ACL tears). * **Lachman Test:** This is the most sensitive clinical test for an ACL tear. * **Anatomy Tip:** The ACL prevents **anterior** displacement of the tibia on the femur, while the PCL (also in the intercondylar area) prevents **posterior** displacement.

Question 285: What bone forms the summit of the medial longitudinal arch of the foot?

A. Calcaneum
B. Talus (Correct Answer)
C. Navicular
D. Medial Cuneiform

Explanation: **Explanation:** The **medial longitudinal arch** is the highest and most important arch of the foot, designed for shock absorption and propulsion. The **Talus** is the correct answer because it serves as the **"Keystone"** or the **summit** of this arch. It is the highest point where the weight of the body is transmitted from the tibia to the foot. **Why Talus is Correct:** The arch is composed of the calcaneum, talus, navicular, three cuneiforms, and the medial three metatarsals. The talus sits at the apex; its head fits into the acetabulum pedis (formed by the navicular and calcaneum), acting as the central point that receives and distributes mechanical stress. **Analysis of Incorrect Options:** * **A. Calcaneum:** Forms the **posterior pillar** of the arch. It provides the base for weight-bearing but is not the highest point. * **C. Navicular:** Located anterior to the talus. While it is a vital component of the arch’s "spring" mechanism, it sits lower than the talus. * **D. Medial Cuneiform:** Forms part of the **anterior pillar** of the arch, situated distal to the navicular. **High-Yield Clinical Pearls for NEET-PG:** * **Keystone of Lateral Longitudinal Arch:** Cuboid bone. * **Main Tie-Beam:** Plantar aponeurosis (prevents the arch from spreading). * **Main Dynamic Support:** Tibialis posterior tendon (its failure leads to flat foot/Pes Planus). * **Spring Ligament:** The Plantar Calcaneonavicular ligament; it supports the head of the talus at the summit. * **Highest point of the Lateral Arch:** The articular tubercle of the calcaneum.

Question 286: Which of the following is NOT a content of the adductor canal?

A. Femoral artery
B. Femoral vein
C. Saphenous nerve
D. Nerve to vastus lateralis (Correct Answer)

Explanation: The **Adductor Canal** (also known as Hunter’s canal or the subsartorial canal) is an aponeurotic tunnel in the middle third of the thigh. It serves as a passageway for structures moving from the femoral triangle to the popliteal fossa. ### **Why "Nerve to Vastus Lateralis" is the Correct Answer** The **nerve to vastus lateralis** is a branch of the posterior division of the femoral nerve, but it does **not** enter the adductor canal. Instead, it descends lateral to the canal to supply the vastus lateralis muscle. In contrast, the **nerve to vastus medialis** is a key content of the canal, entering it to supply the medial quadriceps. ### **Analysis of Incorrect Options** * **Femoral Artery (A):** This is the primary arterial content. It enters the canal at the apex of the femoral triangle and exits through the adductor hiatus to become the popliteal artery. * **Femoral Vein (B):** It accompanies the artery throughout the canal. Its position changes from medial to the artery (inferiorly) to posterior to the artery (superiorly). * **Saphenous Nerve (C):** This is the longest cutaneous branch of the femoral nerve. It travels within the canal but does not pass through the adductor hiatus; instead, it pierces the fascial roof to become superficial. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Boundaries:** Anterolateral (Vastus medialis), Posterior (Adductor longus/magnus), and Medial/Roof (Sartorius). 2. **Contents Summary:** Femoral artery, Femoral vein, Saphenous nerve, and Nerve to vastus medialis. 3. **Adductor Canal Block:** A common regional anesthesia technique used for knee surgeries (e.g., TKR) because it provides sensory blockade (via the saphenous nerve) while sparing the motor power of the quadriceps (except vastus medialis). 4. **Subsartorial Plexus:** Located on the fascia of the canal, formed by branches of the saphenous, obturator, and medial femoral cutaneous nerves.

Question 287: The adductor canal lies beneath which muscle?

A. Adductor longus
B. Adductor magnus
C. Sartorius (Correct Answer)
D. Vastus medialis

Explanation: 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 thigh. It serves as a passage for the femoral vessels to reach the popliteal fossa. ### Why Sartorius is Correct The adductor canal is bounded by three distinct muscular/fascial walls. The **Sartorius muscle** forms the **roof** (superficial boundary) of the canal, supported by the subsartorial fascia. Because the canal is situated deep to this muscle, it is frequently referred to as the "subsartorial canal." ### Analysis of Incorrect Options * **Adductor Longus:** Forms the **posterior wall (floor)** of the canal in its upper part. * **Adductor Magnus:** Forms the **posterior wall (floor)** of the canal in its lower part. The canal ends at the adductor hiatus within this muscle. * **Vastus Medialis:** Forms the **anterolateral wall** of the canal. ### NEET-PG High-Yield Pearls * **Extent:** It begins at the apex of the femoral triangle and ends at the adductor hiatus (opening in the adductor magnus). * **Contents:** 1. **Femoral Artery** 2. **Femoral Vein** 3. **Saphenous Nerve** (Note: This is the longest cutaneous branch of the femoral nerve and exits the canal by piercing the roof). 4. **Nerve to Vastus Medialis.** * **Clinical Significance:** The **Adductor Canal Block** is a common regional anesthesia technique used for knee surgeries (e.g., TKR) because it provides sensory blockade via the saphenous nerve while sparing the motor fibers of the femoral nerve, allowing for early mobilization.

Question 288: A patient with severe atherosclerosis of the external iliac artery and adjacent femoral artery is scheduled for coronary artery bypass surgery. The surgeon decides to use a long, mostly unbranched muscular vein found on the medial aspect of the leg both above and below the knee. Through which of the following structures does this vein pass to eventually join the femoral vein?

A. Anatomic snuff box
B. Antecubital fossa
C. Fossa ovalis (Correct Answer)
D. Inguinal canal

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The vein described is the **Great Saphenous Vein (GSV)**. It is the longest vein in the body, running along the medial aspect of the leg and thigh [1]. It is frequently used as a graft in Coronary Artery Bypass Grafting (CABG) due to its length and accessibility [2]. After ascending the medial side of the thigh, the GSV must pierce the deep fascia (fascia lata) to drain into the **Femoral Vein**. This specific opening in the fascia lata is known as the **Fossa Ovalis** (or the saphenous opening), located approximately 3-4 cm inferolateral to the pubic tubercle. **2. Why the Incorrect Options are Wrong:** * **A. Anatomic Snuff Box:** This is a landmark of the upper limb (radial side of the wrist). It contains the radial artery, not the GSV. * **B. Antecubital Fossa:** This is located at the anterior aspect of the elbow. While it contains veins (like the median cubital vein), it is unrelated to the drainage of the lower limb. * **C. Saphenous Opening/Fossa Ovalis:** (Note: This refers to the correct structure described in the explanation). * **D. Inguinal Canal:** This is a passage in the anterior abdominal wall that transmits the spermatic cord (in males) or the round ligament (in females). The GSV remains superficial to the inguinal ligament until it enters the fossa ovalis. **3. Clinical Pearls for NEET-PG:** * **Surface Anatomy:** The GSV passes **anterior** to the medial malleolus (common site for venous cut-down) and **posterior** to the medial condyle of the femur. * **Saphenous Nerve:** This nerve runs closely with the GSV in the leg; injury during harvesting leads to numbness on the medial side of the foot. * **Cribriform Fascia:** The fossa ovalis is covered by a thin, perforated layer of fascia called the *fascia cribrosa*. * **Tributaries at the Fossa Ovalis:** Before joining the femoral vein, the GSV receives three high-yield tributaries: Superficial epigastric, Superficial circumflex iliac, and Superficial external pudendal veins [1].

Question 289: All of the following statements regarding menisci are true except?

A. Medial meniscus is more mobile than lateral. (Correct Answer)
B. Lateral meniscus covers more tibial articular surface than medial.
C. Medial meniscus is more commonly injured than lateral.
D. Menisci are predominantly made up of Type I collagen.

Explanation: Explanation: The correct answer is **A**, as the statement is factually incorrect. In reality, the **lateral meniscus is more mobile than the medial meniscus.** **1. Why Option A is the Correct Answer (The False Statement):** The medial meniscus is firmly attached to the deep part of the **Medial Collateral Ligament (MCL)** and the joint capsule. This tethering restricts its movement during knee flexion and extension. In contrast, the lateral meniscus is not attached to the Lateral Collateral Ligament (LCL) and is separated from the capsule by the **popliteus tendon**, making it significantly more mobile (moving up to 10-12mm compared to the medial's 2-5mm). **2. Analysis of Other Options:** * **Option B:** The lateral meniscus is nearly circular and covers approximately **70-80%** of the lateral tibial plateau. The medial meniscus is "C-shaped" and covers only about **50-60%** of the medial plateau. * **Option C:** Because the medial meniscus is fixed and less mobile, it cannot "glide" out of the way during forceful rotations. This makes it **20 times more prone to injury** than the lateral meniscus. * **Option D:** Menisci are composed of **fibrocartilage**, which is predominantly made of **Type I collagen** (unlike articular hyaline cartilage, which is Type II). **High-Yield Clinical Pearls for NEET-PG:** * **O’Donoghue’s Unhappy Triad:** Simultaneous injury to the Anterior Cruciate Ligament (ACL), Medial Collateral Ligament (MCL), and Medial Meniscus. * **Blood Supply:** Only the peripheral 1/3 (Red Zone) is vascularized; otherwise the inner 2/3 (White Zone) is avascular and relies on synovial fluid for nutrition, leading to poor healing. * **Nerve Supply:** Only the horns and peripheral vascular zone are innervated. * **McMurray Test:** Used clinically to diagnose meniscal tears.

Question 290: Which of the following statements is true regarding the Peroneus longus muscle?

A. Inverts the foot
B. Is supplied by the deep peroneal nerve
C. Helps maintain the arches of the foot (Correct Answer)
D. Arises from the tibia

Explanation: The **Peroneus longus** (Fibularis longus) is a key muscle of the lateral compartment of the leg. Understanding its unique course and insertion is vital for NEET-PG. ### **Explanation of the Correct Option** **C. Helps maintain the arches of the foot:** The tendon of the peroneus longus passes behind the lateral malleolus, crosses the sole of the foot obliquely from the lateral to the medial side, and inserts into the base of the **1st metatarsal and medial cuneiform**. This "sling-like" mechanism allows it to pull the medial and lateral sides of the foot together, acting as a primary dynamic stabilizer for the **lateral longitudinal arch** and the **transverse arch** of the foot. ### **Analysis of Incorrect Options** * **A. Inverts the foot:** Incorrect. The peroneus longus is a powerful **evertor** of the foot at the subtalar and transverse tarsal joints. It also assists in plantarflexion. * **B. Is supplied by the deep peroneal nerve:** Incorrect. It is supplied by the **superficial peroneal nerve** (L5, S1, S2). The deep peroneal nerve supplies the anterior compartment of the leg. * **D. Arises from the tibia:** Incorrect. It arises from the **head and upper two-thirds of the lateral surface of the fibula**. No muscles of the lateral compartment arise from the tibia. ### **High-Yield Clinical Pearls for NEET-PG** * **The "Stirrup" of the Foot:** Together with the **Tibialis anterior**, the Peroneus longus forms a functional "stirrup" that supports the arches. * **Nerve Injury:** Injury to the common peroneal nerve (at the neck of the fibula) leads to loss of eversion (lateral compartment) and dorsiflexion (anterior compartment), resulting in **Foot Drop**. * **Tendon Landmark:** The tendon of the peroneus longus runs in a groove on the **cuboid bone**, which is often converted into a canal by the long plantar ligament.

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Lower Limb — MCQs

Lower Limb — MCQs

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