Lower Limb — MCQs

A neurosurgeon is replacing a portion of the dura mater removed during tumor excision. The replacement tissue is a band of aponeurotic tissue from the lateral aspect of the thigh, covering the vastus lateralis muscle. Which muscle, supplied by the inferior gluteal nerve, inserts into this dense tissue band as part of its insertion?

Q450Easy

Which joint is commonly involved in osteochondritis dissecans?

Lower Limb Indian Medical PG Practice Questions and MCQs

Question 441: Which of the following lies lateral to the sheath of the femoral hernia?

A. Femoral artery
B. Lateral cutaneous nerve of the thigh
C. Femoral vein (Correct Answer)
D. Femoral nerve

Explanation: ### Explanation The **femoral sheath** is a funnel-shaped fascial sleeve that encloses the upper 4 cm of the femoral vessels. It is divided into three distinct compartments by vertical septa: 1. **Lateral compartment:** Contains the **Femoral artery**. 2. **Intermediate compartment:** Contains the **Femoral vein**. 3. **Medial compartment (Femoral canal):** Contains lymph nodes (Cloquet’s node) and connective tissue. A **femoral hernia** occurs when abdominal contents protrude through the femoral canal (the medial compartment) [1]. Therefore, the structure immediately **lateral** to the femoral canal (and the hernia within it) is the **Femoral vein** [1]. #### Analysis of Options: * **Femoral vein (Correct):** It occupies the intermediate compartment of the sheath, positioned directly lateral to the femoral canal [1]. * **Femoral artery (Incorrect):** It lies in the lateral compartment of the sheath, making it lateral to the femoral vein, but not the immediate lateral relation of a femoral hernia. * **Femoral nerve (Incorrect):** Crucially, the femoral nerve lies **outside and lateral to the femoral sheath**, resting in the groove between the Psoas major and Iliacus muscles. * **Lateral cutaneous nerve of thigh (Incorrect):** This nerve enters the thigh medial to the ASIS, far lateral to the femoral sheath [1]. #### High-Yield Clinical Pearls: * **Femoral Canal Boundaries:** Anteriorly (Inguinal ligament), Posteriorly (Pectineal ligament/Pectineus), Medially (Lacunar ligament), and **Laterally (Femoral vein)**. * **Femoral Hernia:** More common in females due to a wider pelvis [2]. It is highly prone to **strangulation** because of the rigid boundaries of the femoral ring (especially the sharp lacunar ligament) [2]. * **NAVEL Mnemonic (Lateral to Medial):** **N**erve, **A**rtery, **V**ein, **E**mpty space (Canal), **L**ymphatics. Note that the Nerve is the only structure outside the sheath.

Question 442: Which muscle is NOT located in the anterior compartment of the thigh?

A. Iliacus
B. Sartorius
C. Gracilis (Correct Answer)
D. Rectus femoris

Explanation: The thigh is divided into three distinct compartments by intermuscular septa: Anterior (Extensor), Medial (Adductor), and Posterior (Flexor). **Why Gracilis is the Correct Answer:** The **Gracilis** belongs to the **Medial Compartment** of the thigh. It is a thin, strap-like muscle that originates from the body and inferior ramus of the pubis and inserts into the upper part of the medial surface of the tibia (as part of the Pes Anserinus). Its primary actions are adduction of the thigh and flexion of the leg at the knee. It is supplied by the **obturator nerve**. **Analysis of Incorrect Options:** * **Iliacus:** Along with the Psoas Major (forming the Iliopsoas), it is considered the chief flexor of the thigh and is located in the anterior compartment. It is supplied by the femoral nerve. * **Sartorius:** Known as the "Tailor's muscle," it is the longest muscle in the body and is a superficial member of the anterior compartment. It is supplied by the femoral nerve. * **Rectus Femoris:** This is one of the four heads of the Quadriceps Femoris, the primary muscle group of the anterior compartment. It is unique because it crosses both the hip and knee joints. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply Rule:** All muscles of the anterior compartment are supplied by the **Femoral Nerve (L2-L4)**. * **Pes Anserinus:** Remember the mnemonic **"SGT"** (Sartorius, Gracilis, Semitendinosus) for the three muscles that insert on the medial tibia. They are supplied by three different nerves: Femoral, Obturator, and Sciatic (Tibial part), respectively. * **Gracilis Graft:** Due to its length and relatively weak contribution to adduction, the Gracilis is frequently used as a flap in reconstructive surgery (e.g., facial reanimation or sphincter repair).

Question 443: All of the following muscles attach to the greater trochanter of the femur, EXCEPT?

A. Gluteus minimus
B. Gluteus medius
C. Gluteus maximus (Correct Answer)
D. None of the above

Explanation: The **greater trochanter** is a large, quadrangular prominence on the proximal femur that serves as a major insertion site for the abductors and rotators of the hip. [1] ### Why Gluteus Maximus is the Correct Answer The **Gluteus maximus** does not attach to the greater trochanter. Instead, it has two distinct distal insertions: 1. **Superficial/Larger portion (75%):** Inserts into the **Iliotibial tract (ITT)**. 2. **Deep/Smaller portion (25%):** Inserts into the **Gluteal tuberosity** on the posterior aspect of the proximal femoral shaft. ### Analysis of Incorrect Options * **Gluteus medius:** This muscle inserts onto the **lateral surface** of the greater trochanter [1]. It is a primary abductor of the hip. * **Gluteus minimus:** This muscle inserts onto the **anterior surface** of the greater trochanter. Along with the medius, it stabilizes the pelvis during the swing phase of walking. ### High-Yield Facts for NEET-PG To master questions on the greater trochanter, remember the "Mnemonic" for muscles attaching here: **"P-O-G-O-Q"** (though some are more high-yield than others): * **Anterior surface:** Gluteus minimus. * **Lateral surface:** Gluteus medius. * **Superior border:** Piriformis. * **Medial surface (Trochanteric fossa):** Obturator externus. * **Medial surface (above the fossa):** Obturator internus and the Gemelli muscles. **Clinical Pearl:** The **Trendelenburg Sign** occurs when the Gluteus medius and minimus (which attach to the greater trochanter) are paralyzed or weakened, causing the pelvis to drop on the unsupported side during walking. [1]

Question 444: Given below shows an examination technique. The structure being examined originated from which artery?

A. Popliteal Artery
B. Anterior Tibial Artery (Correct Answer)
C. Posterior Tibial Artery
D. Dorsal Arch of Foot

Explanation: ***Anterior Tibial Artery*** - The image shows palpation of the **dorsalis pedis pulse** on the dorsum of the foot, which is the direct continuation of the **anterior tibial artery** below the extensor retinaculum. - This pulse is clinically significant for assessing **peripheral vascular status** and detecting **peripheral arterial disease**. *Popliteal Artery* - The popliteal artery divides into **anterior and posterior tibial arteries** at the knee level, not directly supplying the dorsalis pedis. - Popliteal pulse is palpated in the **popliteal fossa** behind the knee, not on the dorsum of the foot. *Posterior Tibial Artery* - The posterior tibial artery runs behind the **medial malleolus** and gives rise to the **plantar arteries**, not the dorsalis pedis. - Its pulse is palpated **posterior to the medial malleolus**, not on the dorsum of the foot as shown. *Dorsal Arch of Foot* - The **dorsal venous arch** is a venous structure, not an arterial structure that would have a palpable pulse. - The dorsalis pedis artery contributes to the **deep plantar arch**, but the dorsal arch itself is not the origin of this pulse.

Question 445: Which of the following is a muscle of the anterior compartment of the leg?

A. Peroneus tertius (Correct Answer)
B. Peroneus brevis
C. Peroneus longus
D. Flexor digitorum longus

Explanation: The leg is divided into three osteofascial compartments: anterior, lateral, and posterior. Understanding the contents of these compartments is high-yield for NEET-PG. **Why Peroneus Tertius is Correct:** The **Peroneus tertius** (also known as Fibularis tertius) is anatomically a part of the **Anterior Compartment**. It originates from the lower third of the anterior surface of the fibula and inserts into the base of the 5th metatarsal. Like all muscles in this compartment, it is supplied by the **Deep Peroneal Nerve**. Functionally, it acts as a dorsiflexor and evertor of the foot. **Analysis of Incorrect Options:** * **Peroneus longus & Peroneus brevis (Options B & C):** These muscles belong to the **Lateral Compartment** of the leg. They are primarily evertors of the foot and are supplied by the **Superficial Peroneal Nerve**. * **Flexor digitorum longus (Option D):** This muscle belongs to the **Deep Posterior Compartment** of the leg. It is responsible for plantarflexion of the toes and foot and is supplied by the **Tibial Nerve**. **High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of Four":** There are four muscles in the anterior compartment: Tibialis anterior, Extensor hallucis longus, Extensor digitorum longus, and **Peroneus tertius**. * **Nerve Supply:** The Deep Peroneal Nerve is the nerve of the anterior compartment. Injury to this nerve leads to **Foot Drop**. * **Unique Feature:** Peroneus tertius is often considered a detached part of the Extensor digitorum longus and is unique to humans, playing a role in efficient bipedal walking.

Question 446: Inversion and eversion of the foot occur at which joint?

A. Subtalar joint (Correct Answer)
B. Tibiotalar joint
C. Inferior tibiofibular joint
D. Tarso-metatarsal joint

Explanation: The movements of **inversion** (turning the sole inward) and **eversion** (turning the sole outward) are complex movements that occur primarily at the **subtalar joint**, with significant contribution from the **talocalcaneonavicular** and **transverse tarsal (midtarsal)** joints. 1. **Subtalar Joint (Correct):** This is the articulation between the inferior surface of the talus and the superior surface of the calcaneus. It is functionally designed to allow the foot to adapt to uneven terrain through gliding and rotation, facilitating inversion and eversion. 2. **Tibiotalar Joint (Incorrect):** Also known as the ankle joint proper, this is a hinge joint. Its primary movements are **dorsiflexion and plantarflexion**. It does not allow for lateral rotation or inversion/eversion. 3. **Inferior Tibiofibular Joint (Incorrect):** This is a syndesmosis (fibrous joint) that holds the tibia and fibula together. It allows for minimal movement to accommodate the talus during dorsiflexion but does not participate in foot inversion/eversion. 4. **Tarso-metatarsal Joint (Incorrect):** These are plane synovial joints between the distal tarsal bones and the bases of the metatarsals. They allow for slight gliding but are not the primary site for inversion/eversion. **Clinical Pearls for NEET-PG:** * **Muscles:** Inversion is primarily performed by the **Tibialis Anterior** and **Tibialis Posterior**. Eversion is performed by the **Peroneus (Fibularis) Longus** and **Brevis**. * **Ligament Injuries:** Inversion injuries are more common, often leading to sprains of the **Anterior Talofibular Ligament (ATFL)**. * **Axis of Movement:** The axis for inversion/eversion is oblique, passing through the sinus tarsi.

Question 447: The gluteus maximus muscle is inserted onto which of the following structures?

A. Lesser trochanter
B. Greater trochanter
C. Spiral line
D. Iliotibial tract (Correct Answer)

Explanation: **Explanation:** The **Gluteus Maximus** is the largest and most superficial muscle of the gluteal region. Its insertion is unique because it attaches to two distinct structures: 1. **Iliotibial Tract (ITT):** Approximately **three-quarters (upper/superficial fibers)** of the muscle insert into the IT tract, which then attaches to the lateral condyle of the tibia (Gerdy’s tubercle). 2. **Gluteal Tuberosity:** The remaining **one-quarter (lower/deep fibers)** insert into the gluteal tuberosity of the femur. **Analysis of Options:** * **Option D (Correct):** As stated above, the majority of the muscle fibers insert into the IT tract, making it the primary site of insertion. * **Option A (Lesser Trochanter):** This is the insertion site for the **Iliopsoas** muscle (the chief flexor of the hip). * **Option B (Greater Trochanter):** This serves as the insertion for several muscle, including the **Gluteus Medius, Gluteus Minimus, Piriformis,** and **Obturator Internus**, but not the Gluteus Maximus. * **Option C (Spiral Line):** This is a ridge on the posterior femur that provides origin to the **Vastus Medialis** and is continuous with the pectineal line. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** It is the only muscle supplied by the **Inferior Gluteal Nerve (L5, S1, S2)**. * **Function:** It is the chief **extensor** of the hip (essential for climbing stairs and rising from a sitting position). * **Trendelenburg Test:** While Gluteus Maximus is a powerful extensor, the Trendelenburg sign is associated with paralysis of the **Gluteus Medius and Minimus** (hip abductors).

Question 448: Which structure is supplied by the deep peroneal nerve?

A. First web space of the foot (Correct Answer)
B. Anterolateral aspect of the leg
C. Fourth web space of the foot
D. Lateral aspect of the foot

Explanation: The **Deep Peroneal Nerve (DPN)**, also known as the deep fibular nerve, is one of the two terminal branches of the Common Peroneal Nerve. It is primarily a motor nerve supplying the muscles of the anterior compartment of the leg and the dorsum of the foot. **Explanation of the Correct Answer:** * **Option A:** While the DPN is predominantly motor, it has a very specific and high-yield **sensory** distribution. It provides cutaneous innervation only to the **skin of the first interdigital cleft (first web space)** between the great toe and the second toe. This is a classic "spot diagnosis" in anatomy exams. **Explanation of Incorrect Options:** * **Option B (Anterolateral aspect of the leg):** This area is primarily supplied by the **Lateral Cutaneous Nerve of the Calf** (a branch of the common peroneal nerve) and the **Superficial Peroneal Nerve**. * **Option C (Fourth web space):** This area, along with the second and third web spaces, is supplied by the **Superficial Peroneal Nerve** (via its medial and intermediate dorsal cutaneous branches). * **Option D (Lateral aspect of the foot):** This region is supplied by the **Sural Nerve**, which is a branch derived from both the Tibial and Common Peroneal nerves. **High-Yield Clinical Pearls for NEET-PG:** * **Foot Drop:** Injury to the Common Peroneal Nerve (at the neck of the fibula) leads to paralysis of the DPN, resulting in loss of dorsiflexion (Foot Drop) and sensory loss in the first web space. * **Anterior Compartment Syndrome:** The DPN can be compressed in this syndrome, leading to "Ski Boot Syndrome," where the patient presents with pain and sensory loss in the first web space. * **Motor Supply:** Remember the mnemonic **"E-I-E-I-O"** for DPN muscles: **E**xtensor digitorum longus, **I**nverted (Tibialis anterior), **E**xtensor hallucis longus, **I**nferior (Peroneus tertius), and **O**ffshoot (Extensor digitorum brevis).

Question 449: A neurosurgeon is replacing a portion of the dura mater removed during tumor excision. The replacement tissue is a band of aponeurotic tissue from the lateral aspect of the thigh, covering the vastus lateralis muscle. Which muscle, supplied by the inferior gluteal nerve, inserts into this dense tissue band as part of its insertion?

A. Gluteus medius
B. Gluteus minimus
C. Gluteus maximus (Correct Answer)
D. Tensor fasciae latae

Explanation: ### Explanation **1. Why Gluteus Maximus is Correct:** The tissue described is the **Iliotibial Tract (ITT)**, a thickened lateral portion of the *fascia lata* that covers the vastus lateralis. The **Gluteus maximus** has a unique dual insertion: * **Superficial 3/4th (larger part):** Inserts into the posterior aspect of the **Iliotibial tract**. * **Deep 1/4th (lower fibers):** Inserts into the **gluteal tuberosity** of the femur. The question specifies the muscle is supplied by the **inferior gluteal nerve** (L5, S1, S2), which is the definitive nerve supply for the Gluteus maximus. **2. Why Other Options are Incorrect:** * **Gluteus medius & Gluteus minimus:** These muscles insert into the **greater trochanter** of the femur (lateral and anterior surfaces, respectively). Crucially, they are supplied by the **superior gluteal nerve**. * **Tensor fasciae latae (TFL):** While the TFL does insert into the Iliotibial tract, it is supplied by the **superior gluteal nerve**, not the inferior gluteal nerve. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Dura Mater Repair:** The Iliotibial tract is a common source for autologous grafting in neurosurgery (duraplasty) and orthopedic surgery (ACL reconstruction) due to its high tensile strength. * **Nerve Supply Rule:** * **Superior Gluteal Nerve:** Supplies Gluteus medius, Gluteus minimus, and Tensor fasciae latae. * **Inferior Gluteal Nerve:** Supplies *only* the Gluteus maximus. * **Trendelenburg Sign:** Injury to the superior gluteal nerve leads to paralysis of the medius/minimus, causing the pelvis to tilt toward the unsupported side during walking. * **Function:** The Gluteus maximus is the chief extensor of the hip (essential for climbing stairs/rising from a sitting position), while the ITT helps stabilize the knee joint in extension.

Question 450: Which joint is commonly involved in osteochondritis dissecans?

A. Ankle joint
B. Knee joint (Correct Answer)
C. Wrist joint
D. Elbow joint

Explanation: **Explanation:** **Osteochondritis Dissecans (OCD)** is a joint condition where bone underneath the cartilage of a joint dies due to lack of blood flow (avascular necrosis). This bone and cartilage can then break loose, causing pain and joint instability. **Why the Knee Joint is Correct:** The **knee joint** is the most common site for OCD, accounting for approximately 75% of all clinical cases. Specifically, the **lateral aspect of the medial femoral condyle** is the most frequent site of involvement (often remembered by the mnemonic **LAME**: Lateral Aspect of Medial Eminence/Condyle). It typically affects adolescents and young adults, often linked to repetitive microtrauma. **Analysis of Incorrect Options:** * **Ankle Joint:** While the talus is the second most common site for OCD, it occurs much less frequently than in the knee. * **Elbow Joint:** OCD can occur here (specifically the capitellum), usually in young athletes like pitchers or gymnasts, but it is less common than knee involvement. * **Wrist Joint:** This is a very rare site for OCD. Conditions like Kienböck's disease (lunate necrosis) are more common in the wrist but are pathologically distinct from classic OCD. **Clinical Pearls for NEET-PG:** * **Classic Site:** Lateral surface of the Medial Femoral Condyle (70-80% of knee cases). * **Wilson’s Sign:** A clinical test for OCD of the knee where internal rotation of the tibia during extension causes pain, which is relieved by external rotation. * **Imaging:** X-ray may show a "joint mouse" (loose body). MRI is the gold standard for assessing the stability of the fragment. * **Etiology:** Most commonly attributed to repetitive microtrauma and ischemia.

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Lower Limb — MCQs

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