Lower Limb — MCQs

Lower Limb Indian Medical PG Practice Questions and MCQs

Question 71: Which of the following is NOT TRUE about the Iliotibial tract?

A. The distal end of the Iliotibial tract is attached to Gerdy's tubercle.
B. The Tensor fascia lata muscle inserts onto the Iliotibial tract.
C. The Gluteus minimus muscle inserts onto the Iliotibial tract. (Correct Answer)
D. Contracture of the Iliotibial tract leads to flexion, external rotation, and posterior subluxation.

Explanation: **Explanation:** The **Iliotibial (IT) tract** is a thickened lateral portion of the fascia lata that acts as a combined tendon for specific gluteal muscles and serves as a vital lateral stabilizer of the knee. **1. Why Option C is the Correct Answer (The False Statement):** The **Gluteus minimus** does not insert into the IT tract; it inserts onto the **anterior border of the greater trochanter** of the femur. Its primary action is abduction and medial rotation of the hip. In contrast, the IT tract receives the insertion of the **Tensor Fasciae Latae (TFL)** and approximately **three-quarters (superficial fibers) of the Gluteus maximus**. **2. Analysis of Other Options:** * **Option A:** The distal attachment of the IT tract is indeed **Gerdy’s tubercle** on the lateral condyle of the tibia. This is a high-yield anatomical landmark. * **Option B:** The TFL muscle is enclosed between two layers of the fascia lata, which then fuse to form the IT tract. * **Option C:** (Discussed above). * **Option D:** Contracture of the IT tract (often seen in polio or chronic IT band syndrome) pulls the limb into a characteristic deformity: **flexion, abduction, and external rotation** at the hip, and can lead to posterior subluxation of the knee due to its lateral and posterior pull. **Clinical Pearls for NEET-PG:** * **Ober’s Test:** Used to clinical assess IT tract tightness/contracture. * **IT Band Syndrome:** A common overuse injury in runners causing lateral knee pain due to friction against the lateral femoral epicondyle. * **Stability:** The IT tract is crucial for maintaining the knee in extension, especially when standing, reducing the muscular effort required.

Question 72: What is the nerve root value for the knee jerk reflex?

A. T12 L1 L2
B. L2 L3 L4 (Correct Answer)
C. L5 S1
D. S2 S3

Explanation: The knee jerk reflex (patellar reflex) is a classic example of a **monosynaptic deep tendon reflex** [1]. When the patellar tendon is tapped, it stretches the quadriceps femoris muscle, stimulating muscle spindles. This sensory impulse travels via the **femoral nerve** to the spinal cord. ### Why L2, L3, L4 is Correct: The motor supply to the quadriceps femoris muscle is provided by the femoral nerve, which originates from the **ventral rami of L2, L3, and L4** spinal nerves. L3 and L4 are considered the primary segments responsible for this reflex, but the functional unit encompasses the L2-L4 distribution. ### Analysis of Incorrect Options: * **A. T12 L1 L2:** These roots primarily supply the iliopsoas (hip flexion) and the inguinal region. T12-L1 is associated with the Cremasteric reflex. * **C. L5 S1:** These are the root values for the **Ankle Jerk** (Achilles reflex) and are also involved in the Plantar response (Babinski sign). * **D. S2 S3:** These roots contribute to the nerve supply of the intrinsic foot muscles and are critical for bladder and bowel function (S2-S4). ### Clinical Pearls for NEET-PG: * **Nerve Involved:** Femoral Nerve. * **Muscle Involved:** Quadriceps femoris. * **Grading:** A pendular knee jerk (oscillating like a pendulum) is a classic sign of **Cerebellar lesions**. * **Westphal’s Sign:** The absence or decrease of the patellar reflex, often seen in Tabes Dorsalis or lower motor neuron lesions. * **Jendrassik Maneuver:** A distraction technique (clinching teeth/hooking fingers) used to accentuate a sluggish reflex by reducing descending inhibition.

Question 73: The musculi genu is related to which of the following muscles?

A. Vastus lateralis
B. Vastus intermedius (Correct Answer)
C. Vastus medialis
D. Rectus femoris

Explanation: The Articularis genu (also known as the musculi genu) is a small, flat skeletal muscle located in the anterior compartment of the thigh, deep to the vastus intermedius. Why Vastus Intermedius is correct: The articularis genu is anatomically derived from the deepest fibers of the vastus intermedius. It originates from the anterior surface of the lower part of the shaft of the femur and inserts into the apex of the suprapatellar bursa (an extension of the synovial membrane of the knee joint). Its primary function is to pull the suprapatellar bursa superiorly during extension of the knee, preventing the synovial membrane from being trapped or pinched between the femur and the patella. Why other options are incorrect: * Vastus lateralis & Vastus medialis: These are the largest components of the quadriceps femoris, forming the lateral and medial bulks of the thigh. While they contribute to the extensor mechanism via the patellar retinacula, they do not give rise to the articularis genu. * Rectus femoris: This is the most superficial muscle of the quadriceps group and is unique because it crosses two joints (hip and knee). It is separated from the articularis genu by the vastus intermedius. High-Yield Clinical Pearls for NEET-PG: * Nerve Supply: Like all muscles of the anterior compartment of the thigh, it is supplied by the femoral nerve (L2-L4). * Function: It acts as a "tensor" of the joint capsule. * Clinical Relevance: Weakness or dysfunction of this muscle can lead to "impingement" of the suprapatellar bursa, causing anterior knee pain during extension.

Question 74: Which of the following muscles causes hip extension and knee flexion?

A. Semitendinosus (Correct Answer)
B. Gastrosoleus
C. Psoas major
D. Tensor Fascia lata

Explanation: **Explanation:** The muscle described is a member of the **Hamstring group**. To perform both hip extension and knee flexion, a muscle must cross two joints: the hip (posteriorly) and the knee (posteriorly). **1. Why Semitendinosus is Correct:** The Semitendinosus, along with the Semimembranosus and the long head of Biceps Femoris, originates from the **ischial tuberosity** and inserts below the knee (medial surface of the tibia). Because it crosses the hip joint posteriorly, it acts as a powerful **extensor of the hip**. Because it crosses the knee joint posteriorly, it acts as a **flexor of the knee**. **2. Analysis of Incorrect Options:** * **Gastrosoleus:** This complex (Gastrocnemius and Soleus) acts primarily on the ankle (plantarflexion). While the Gastrocnemius crosses the knee and assists in flexion, it has no action on the hip. * **Psoas major:** This is the primary **flexor of the hip**. It does not cross the knee joint and acts in direct opposition to the hamstrings at the hip. * **Tensor Fascia Lata (TFL):** This muscle is primarily a **flexor, abductor, and internal rotator** of the hip. It also helps stabilize the knee in extension via the Iliotibial (IT) tract. **High-Yield NEET-PG Pearls:** * **The "True" Hamstrings:** To be a true hamstring, a muscle must originate from the ischial tuberosity, insert below the knee, and be innervated by the **tibial part of the sciatic nerve**. * **Short Head of Biceps Femoris:** This is often a "trap" in exams. It is **not** a true hamstring because it originates from the femur (not the ischium) and only acts on the knee, not the hip. * **Pes Anserinus:** The Semitendinosus inserts into the medial tibia via the Pes Anserinus, along with the **Sartorius** and **Gracilis** (Mnemonic: **S**ay **G**race before **T**ea).

Question 75: All of the following maintain the stability of the ankle joint except?

A. Cruciate ligament (Correct Answer)
B. Shape of the bones
C. Tendons of muscles that cross the joint
D. Collateral ligament

Explanation: The ankle joint (talocrural joint) is a hinge-type synovial joint that requires significant stability to support body weight during locomotion. Stability is provided by three primary factors: bony architecture, ligaments, and muscular support. **Why "Cruciate Ligament" is the correct answer:** Cruciate ligaments (Anterior and Posterior) are intra-articular ligaments specific to the **knee joint**, not the ankle. They prevent anterior and posterior displacement of the tibia relative to the femur. Their presence in the ankle is anatomically incorrect, making this the "except" option. **Explanation of other options (Stability Factors):** * **Shape of the bones:** The ankle is most stable in **dorsiflexion**. In this position, the wider anterior part of the trochlea of the talus fits tightly into the mortise formed by the malleoli. This "wedge effect" is a primary mechanical stabilizer. * **Collateral ligaments:** The strong **Medial (Deltoid) ligament** and the **Lateral ligament complex** (ATFL, PTFL, and CFL) prevent excessive eversion and inversion, respectively. They are the primary passive stabilizers. * **Tendons of muscles:** Dynamic stability is provided by tendons crossing the joint (e.g., Tibialis anterior/posterior, Peroneus longus/brevis, and the Achilles tendon). Their muscle tone maintains the integrity of the joint during movement. **High-Yield Clinical Pearls for NEET-PG:** * **Most common ankle injury:** Inversion sprain, usually involving the **Anterior Talofibular Ligament (ATFL)**. * **Strongest ligament:** The Deltoid ligament is so strong that extreme eversion often results in a Pott’s fracture (malleolar fracture) rather than a ligamentous tear. * **The "Mortise":** Formed by the distal ends of the tibia and fibula; it is maintained by the inferior tibiofibular syndesmosis.

Question 76: Which of the following is NOT an abductor of the thigh?

A. Sartorius
B. Piriformis (Correct Answer)
C. Gluteus minimus
D. Gluteus medius

Explanation: The primary abductors of the thigh are the **Gluteus medius** and **Gluteus minimus**. To identify the correct answer, one must distinguish between primary abductors and muscles that primarily act as lateral rotators. ### **Explanation of the Correct Answer** **B. Piriformis:** While the piriformis can assist in abduction when the hip is flexed, its **primary action** is the **lateral (external) rotation** of the extended thigh. In the context of standard anatomical classification for NEET-PG, it is categorized as a member of the short lateral rotators of the hip (along with the obturators, gemelli, and quadratus femoris), making it the "least" characteristic abductor among the choices. ### **Analysis of Incorrect Options** * **C & D. Gluteus medius and minimus:** These are the **chief abductors** of the hip. They are supplied by the superior gluteal nerve. Their contraction prevents the tilting of the pelvis to the opposite side during walking. * **A. Sartorius:** Known as the "tailor's muscle," it is a multi-axial muscle that performs flexion, **abduction**, and lateral rotation of the thigh at the hip joint, along with flexion of the knee. ### **High-Yield Clinical Pearls for NEET-PG** * **Trendelenburg Test:** Paralysis of the Gluteus medius and minimus (due to Superior Gluteal Nerve injury) leads to a positive Trendelenburg sign, where the pelvis drops on the unsupported side during single-leg standing. * **Piriformis Syndrome:** Compression of the sciatic nerve by the piriformis muscle can mimic sciatica symptoms. * **Safe Zone for Injections:** Intramuscular injections are given in the superolateral quadrant of the gluteal region to avoid the sciatic nerve and target the gluteus medius.

Question 77: The medial aspect of the great toe is supplied by which nerve?

A. Superficial peroneal nerve
B. Deep peroneal nerve (Correct Answer)
C. Common peroneal palsy
D. Sural nerve

Explanation: The sensory innervation of the foot is a high-yield topic for NEET-PG. To answer this correctly, one must distinguish between the dorsal and plantar surfaces and identify specific "hotspots" of innervation. ### **Explanation** The **Deep Peroneal Nerve (DPN)**, a branch of the Common Peroneal Nerve, enters the foot deep to the extensor retinaculum. While it primarily provides motor supply to the muscles of the dorsal foot (Extensor Digitorum Brevis), its sensory distribution is highly specific: it supplies the **skin of the first interdigital cleft** and the **adjacent sides of the great (1st) and second toes**. Therefore, the medial aspect of the great toe (specifically the lateral side of the medial toe) is the classic territory of the DPN. ### **Analysis of Incorrect Options** * **A. Superficial Peroneal Nerve:** This nerve supplies the majority of the dorsal surface of the foot and the anterior/lateral aspect of the lower leg. However, it characteristically spares the first web space (DPN) and the lateral border of the foot (Sural nerve). * **C. Common Peroneal Palsy:** This is a clinical condition (Foot Drop) resulting from nerve injury at the neck of the fibula, not a specific nerve branch supplying the toe. * **D. Sural Nerve:** This nerve supplies the skin of the lateral malleolus and the **lateral border** of the foot and the little toe. ### **NEET-PG High-Yield Pearls** * **The "First Web Space":** This is the most common way the Deep Peroneal Nerve sensory test is phrased in exams. Loss of sensation here is a sign of **Anterior Compartment Syndrome**. * **Saphenous Nerve:** Remember that the **medial side of the foot** (up to the base of the great toe) is supplied by the Saphenous nerve (a branch of the Femoral nerve). * **Plantar Surface:** The medial and lateral plantar nerves (branches of the Tibial nerve) supply the sole, similar to the median and ulnar nerves in the hand.

Question 78: What is true regarding the origin and insertion of the piriformis muscle?

A. Origin from sacrum and ilium, insertion on the lesser trochanter
B. Origin from sacrum and ilium, insertion on the greater trochanter (Correct Answer)
C. Origin from the ischial tuberosity, insertion on the lesser trochanter
D. Origin from the ischial tuberosity, insertion on the greater trochanter

Explanation: ### Explanation The **Piriformis** is a key landmark muscle of the gluteal region. Understanding its anatomy is crucial for mastering the spatial orientation of the lower limb. **1. Why Option B is Correct:** * **Origin:** The piriformis originates from the **anterior (pelvic) surface of the middle three sacral vertebrae** (S2, S3, and S4) and the upper margin of the **greater sciatic notch** of the ilium. * **Insertion:** It passes out of the pelvis through the greater sciatic foramen to insert into the **upper border (apex) of the greater trochanter** of the femur. * **Action:** It acts as a lateral rotator of the extended thigh and an abductor of the flexed thigh. **2. Why Other Options are Incorrect:** * **Options A & C (Lesser Trochanter):** The lesser trochanter is the insertion site for the **Iliopsoas** muscle. Most short lateral rotators (Piriformis, Obturators, Gemelli) insert on or near the greater trochanter. * **Options C & D (Ischial Tuberosity):** The ischial tuberosity serves as the origin for the **Hamstring muscles** (Biceps femoris, Semitendinosus, Semimembranosus) and the **Gemellus inferior**, but not the piriformis. **3. NEET-PG High-Yield Clinical Pearls:** * **The "Key" Muscle:** Piriformis is the "key" to the gluteal region because it divides the greater sciatic foramen into **suprapiriform** and **infrapiriform** spaces. * **Structures passing ABOVE (Suprapiriform):** Superior gluteal nerve and vessels. * **Structures passing BELOW (Infrapiriform):** Inferior gluteal nerve/vessels, **Sciatic nerve**, Posterior cutaneous nerve of thigh, Nerve to quadratus femoris, and Pudendal nerve/internal pudendal vessels. * **Piriformis Syndrome:** Compression of the sciatic nerve by the piriformis muscle, leading to sciatica-like symptoms.

Question 79: Which of the following is NOT a content of the femoral triangle?

A. Femoral Artery
B. Femoral Vein
C. Superficial Inguinal Lymph Nodes (Correct Answer)
D. Nerve to Pectineus

Explanation: The **femoral triangle** is a subfascial space in the upper third of the thigh. To answer this question correctly, one must distinguish between structures located *within* the triangle (deep to the fascia lata) and those located in the *superficial fascia* overlying it. ### **Why Option C is Correct** The **Superficial Inguinal Lymph Nodes** are located in the superficial fascia of the groin, superficial to the fascia lata. Therefore, they are considered part of the **coverings (roof)** of the femoral triangle, not its contents. The contents of the triangle include the **Deep Inguinal Lymph Nodes** (specifically the Node of Cloquet), which lie medial to the femoral vein within the femoral canal. ### **Analysis of Incorrect Options** * **A. Femoral Artery:** This is a primary content. It traverses the triangle from the midpoint of the inguinal ligament to the apex, contained within the femoral sheath (lateral compartment). * **B. Femoral Vein:** A major content lying medial to the artery. It receives the great saphenous vein within the triangle. * **D. Nerve to Pectineus:** This is a branch of the femoral nerve that arises within the triangle and passes behind the femoral sheath to reach the pectineus muscle. ### **High-Yield NEET-PG Pearls** * **Contents Mnemonic (Lateral to Medial):** **N**erve (Femoral), **A**rtery (Femoral), **V**ein (Femoral), **E**mpty space (Femoral canal), **L**ymphatics (**NAVY**). * **The Femoral Nerve:** Note that the femoral nerve itself lies *outside* the femoral sheath but *inside* the femoral triangle. * **Roof of the Triangle:** Formed by the fascia lata, including the **cribriform fascia** (which is pierced by the great saphenous vein and efferent lymphatics). * **Floor:** Formed (medial to lateral) by the Adductor longus, Pectineus, Psoas major, and Iliacus.

Question 80: Which type of joint is the ankle joint?

A. Plain joint
B. Hinge joint (Correct Answer)
C. Pivot joint
D. Ball and socket joint

Explanation: The ankle joint (talocrural joint) is a classic example of a **synovial hinge joint** (ginglymus). ### **Why Hinge Joint is Correct** The joint is formed by the distal ends of the tibia and fibula (the mortise) articulating with the body of the talus (the tenon). Like a door hinge, it primarily allows movement in a single plane around a transverse axis. These movements are **dorsiflexion** and **plantarflexion**. The joint is most stable in dorsiflexion because the wider anterior part of the trochlea of the talus fits tightly into the mortise. ### **Why Other Options are Incorrect** * **Plane joint:** These allow only gliding or sliding movements (e.g., intermetatarsal joints). * **Pivot joint:** These allow rotation around a longitudinal axis (e.g., proximal radioulnar joint or the atlanto-axial joint). * **Ball and socket joint:** These are multiaxial joints allowing movement in all planes, including rotation (e.g., hip and shoulder joints). ### **High-Yield Clinical Pearls for NEET-PG** * **Stability:** The ankle is most stable in **dorsiflexion** and least stable in **plantarflexion**. Consequently, most ankle injuries occur when the foot is plantarflexed. * **Ligaments:** The **Deltoid ligament** (medial) is extremely strong. The **Anterior Talofibular Ligament (ATFL)** is the most commonly injured ligament in lateral ankle sprains (inversion injuries). * **Inversion/Eversion:** These movements do **not** occur at the ankle joint; they occur at the **subtalar** and transverse tarsal joints. * **Pott’s Fracture:** A fracture-dislocation of the ankle caused by forced eversion.

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Lower Limb — MCQs

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