Lower Limb — MCQs

A 23-year-old female long-distance runner presents with a swollen and painful left foot. She reports stepping on an unseen sharp object while running several days ago, leading to symptoms suggestive of tarsal tunnel syndrome. The tarsal tunnel, located on the medial side of the ankle, transmits tendons, vessels, and nerves beneath the laciniate ligament. Which is the most anterior structure passing through this tunnel?

Q99Easy

Which muscle is the primary abductor of the hip joint?

Q100Easy

Which of the following muscles is NOT an inverter of the foot?

Lower Limb Indian Medical PG Practice Questions and MCQs

Question 91: The adductor canal contains all of the following except:

A. Femoral artery
B. Femoral vein
C. Femoral nerve (Correct Answer)
D. Saphenous nerve

Explanation: The **Adductor Canal** (Hunter’s canal or subsartorial canal) is an aponeurotic tunnel in the middle third of the thigh that serves as a passageway for structures moving from the femoral triangle to the popliteal fossa. ### Why the Femoral Nerve is the Correct Answer The **femoral nerve** itself does not enter the adductor canal. It terminates within the femoral triangle by dividing into several anterior and posterior cutaneous and muscular branches. While some of its branches (like the saphenous nerve and the nerve to vastus medialis) enter the canal, the main trunk of the femoral nerve does not. ### Analysis of Incorrect Options * **Femoral Artery:** This is the primary occupant of the canal. It enters at the apex of the femoral triangle and leaves through the adductor hiatus to become the popliteal artery. * **Femoral Vein:** It lies posterior to the artery in the upper part of the canal and lateral to it in the lower part before exiting through the adductor hiatus. * **Saphenous Nerve:** This is the longest cutaneous branch of the femoral nerve. It enters the canal, crosses the femoral artery from lateral to medial, and eventually pierces the roof of the canal to become superficial. ### High-Yield NEET-PG Pearls * **Boundaries:** Anterolateral (Vastus medialis), Posterior (Adductor longus and magnus), and Medial/Roof (Sartorius). * **Contents:** Femoral artery, Femoral vein, Saphenous nerve, and the **Nerve to vastus medialis**. * **Clinical Significance:** The canal is a common site for an **Adductor Canal Block**, used for regional anesthesia in knee surgeries, as it provides sensory blockade (via the saphenous nerve) while sparing the motor components of the femoral nerve (preserving quadriceps strength).

Question 92: The superficial external pudendal artery is a branch of which of the following arteries?

A. Aorta
B. Femoral artery (Correct Answer)
C. External iliac artery
D. Internal iliac artery

Explanation: **Explanation:** The **superficial external pudendal artery** is one of the three superficial branches of the **femoral artery** that arise just below the inguinal ligament [1]. After piercing the cribriform fascia of the saphenous opening, it passes medially across the spermatic cord (in males) or round ligament (in females) to supply the skin of the lower abdomen, penis, and scrotum (or labium majus). **Why the other options are incorrect:** * **Aorta:** The abdominal aorta terminates at the L4 level by dividing into common iliac arteries. It does not directly supply the superficial tissues of the groin. * **External Iliac Artery:** This artery becomes the femoral artery only after passing behind the inguinal ligament [2]. Its primary branches are the inferior epigastric and deep circumflex iliac arteries, which are located deep to the abdominal wall [2]. * **Internal Iliac Artery:** This artery supplies the pelvic viscera and perineum. While it gives off the *internal* pudendal artery (which supplies the deep structures of the perineum), it does not give off the superficial external pudendal artery. **High-Yield Clinical Pearls for NEET-PG:** 1. **Branches of the Femoral Artery:** Remember the mnemonic for the three superficial branches: **"Superficial ESC"** – **E**xternal pudendal, **S**uperficial epigastric, and **C**ircumflex iliac [1]. 2. **Deep External Pudendal Artery:** This is also a branch of the femoral artery but arises deeper and passes behind the spermatic cord. 3. **Surgical Landmark:** These superficial branches must be identified and ligated during surgeries like varicose vein stripping (Trendelenburg procedure) to prevent hematoma formation [1].

Question 93: The medial longitudinal arch of the foot is maintained by all of the following except?

A. Peroneus longus (Correct Answer)
B. Tibialis posterior
C. Flexor digitorum longus
D. Plantar aponeurosis

Explanation: ### Explanation The medial longitudinal arch is the highest and most important arch of the foot. Its integrity is maintained by the shape of the bones, strong ligaments, and dynamic muscular support. **Why Peroneus Longus is the correct answer:** The **Peroneus (Fibularis) longus** muscle originates from the lateral compartment of the leg. Its tendon passes behind the lateral malleolus, crosses the sole obliquely, and inserts into the base of the 1st metatarsal and medial cuneiform. While it plays a vital role in maintaining the **lateral longitudinal arch** and the **transverse arch**, it actually tends to depress the medial side of the foot to stabilize the first ray against the ground. Therefore, it is not considered a primary support for the medial longitudinal arch. **Analysis of Incorrect Options:** * **Tibialis posterior:** This is the **main dynamic stabilizer** (master tie-beam) of the medial longitudinal arch. It inserts into the navicular tuberosity and spreads to almost all tarsal bones, pulling the arch upward and backward. * **Flexor digitorum longus:** Along with the Flexor hallucis longus, these tendons act as "bowstrings" that prevent the flattening of the medial arch during the toe-off phase of walking. * **Plantar aponeurosis:** This acts as a powerful "tie-beam" connecting the anterior and posterior columns of the arch. Through the **Windlass mechanism**, it tightens during dorsiflexion of the toes, elevating the medial arch. **NEET-PG High-Yield Pearls:** * **Keystone of the Medial Arch:** The Head of the Talus. * **Main Static Stabilizer:** Spring Ligament (Plantar calcaneonavicular ligament). * **Main Dynamic Stabilizer:** Tibialis Posterior. * **Clinical Correlation:** Paralysis of the Tibialis posterior or rupture of the spring ligament leads to **Pes Planus (Flat foot)**.

Question 94: What is the order of the neurovascular bundle within the femoral triangle from medial to lateral?

A. Nerve, artery, vein
B. Vein, artery, nerve (Correct Answer)
C. Artery, vein, nerve
D. Nerve, vein, artery

Explanation: The femoral triangle is a subfascial space in the upper third of the thigh. Understanding the spatial arrangement of its contents is a high-yield topic for NEET-PG. [1] ### 1. The Correct Answer: Vein, Artery, Nerve (VAN) From **medial to lateral**, the structures are arranged as: * **V** - Femoral **V**ein * **A** - Femoral **A**rtery * **N** - Femoral **N**erve **The Medical Concept:** The femoral vein and artery are enclosed within the **femoral sheath**, a funnel-shaped fascial sleeve. The vein occupies the intermediate compartment, while the artery occupies the lateral compartment. Crucially, the **femoral nerve lies outside and lateral to the femoral sheath**, resting in the groove between the psoas major and iliacus muscles. [1] ### 2. Why Other Options are Incorrect * **Option A & D:** These place the nerve medially. The nerve is the most lateral structure and does not enter the femoral canal or sheath. * **Option C:** This reverses the order of the vessels. The vein is always more medial than the artery at the level of the inguinal ligament. ### 3. Clinical Pearls & High-Yield Facts * **Mnemonic:** Remember **VAN** from medial to lateral (towards the "V"an, i.e., the midline). Alternatively, use **NAVY** (Nerve, Artery, Vein, Y-fronts/midline) for lateral to medial. * **Femoral Canal:** This is the most medial compartment of the femoral sheath (medial to the vein). It contains Cloquet’s lymph node and is the site for femoral hernias. [1] * **Clinical Procedure:** To locate the femoral vein for central venous catheterization, palpate the femoral artery pulse; the vein lies immediately **medial** to it.

Question 95: In conditions of valve incompetence affecting the perforating veins of the lower limb, what is the direction of venous blood flow?

A. Along gravity
B. Superficial to deep
C. Along osmotic gradient
D. Deep to superficial (Correct Answer)

Explanation: ### Explanation **1. Understanding the Correct Answer (D):** In a healthy individual, venous blood in the lower limbs flows from the **superficial system** (Great and Small Saphenous veins) to the **deep system** (Femoral and Popliteal veins) via **perforating veins**. These perforators contain one-way valves that prevent reflux. During muscular contraction (the calf muscle pump), pressure in the deep veins increases significantly [1]. If the valves in the perforating veins become **incompetent**, this high-pressure deep venous blood is forced backward—**from deep to superficial**—into the superficial system [1], [3]. **2. Analysis of Incorrect Options:** * **A. Along gravity:** Venous return is designed to work *against* gravity [2]. While incompetence leads to pooling, the specific path through a perforator is defined by the pressure gradient between systems, not just gravity. * **B. Superficial to deep:** This is the **physiological (normal) direction** of flow. Perforators "perforate" the deep fascia to carry blood toward the heart via the deep veins. * **C. Along osmotic gradient:** Venous flow is governed by pressure gradients (hydrostatic) and calf muscle pump mechanics, not osmotic pressure (which governs fluid exchange at the capillary level). **3. High-Yield Clinical Pearls for NEET-PG:** * **Varicose Veins:** Chronic deep-to-superficial reflux leads to the dilation and tortuosity of superficial veins [3]. * **Cockett’s Perforators:** These are the lower medial ankle perforators; their incompetence is a primary cause of **venous ulcers** (Gaiter zone). * **Trendelenburg Test:** Used clinically to differentiate between saphenofemoral junction incompetence and perforator incompetence. * **Brodie-Trendelenburg Test:** A rapid fill of superficial veins upon standing (with a tourniquet applied) indicates incompetent perforators.

Question 96: What is true regarding the hip joint?

A. Medial rotation and abduction are caused by gluteus medius and gluteus minimus. (Correct Answer)
B. Medial rotation and adduction are caused by gluteus medius and gluteus minimus.
C. Lateral rotators of the thigh are supplied by the femoral nerve.
D. Hyperextension of the hip is prevented by capsular thickening.

Explanation: ### Explanation **1. Why Option A is Correct:** The **Gluteus medius** and **Gluteus minimus** are the primary **abductors** of the hip. Their anterior fibers also act as powerful **medial rotators** of the thigh. These muscles are crucial for stabilizing the pelvis during the stance phase of walking; they prevent the pelvis from dropping on the unsupported side (Trendelenburg’s sign). **2. Analysis of Incorrect Options:** * **Option B:** While these muscles cause medial rotation, they are **abductors**, not adductors. The adductor group (Adductor longus, brevis, and magnus) is responsible for adduction and is located in the medial compartment of the thigh. * **Option C:** Most lateral rotators (Piriformis, Obturator internus, Gemelli, Quadratus femoris) are supplied by specific branches of the **sacral plexus** (e.g., nerve to quadratus femoris). The femoral nerve primarily supplies the anterior compartment (hip flexors and knee extensors). * **Option D:** While capsular thickenings (ligaments) do restrict movement, hyperextension is specifically prevented by the **Iliofemoral ligament (Ligament of Bigelow)**, which is the strongest ligament in the body. The statement in D is too vague compared to the functional precision of Option A. **3. NEET-PG High-Yield Pearls:** * **Trendelenburg Test:** Positive when Gluteus medius/minimus are paralyzed (Superior Gluteal Nerve injury), causing the pelvis to tilt toward the healthy side when standing on the affected leg. * **Strongest Ligament:** Iliofemoral ligament (prevents hyperextension). * **Blood Supply:** The **medial circumflex femoral artery** is the most important contributor to the head of the femur; its damage leads to Avascular Necrosis (AVN). * **Nerve Supply:** Hilton’s Law states the hip is supplied by the Femoral, Obturator, and Sciatic nerves.

Question 97: On average, what is the distance between the femoral ring and the saphenous opening (length of the femoral canal)?

A. 1.25 cm (Correct Answer)
B. 2.50 cm
C. 3.75 cm
D. 5.00 cm

Explanation: ### Explanation The **femoral canal** is the small, cone-shaped medial compartment of the femoral sheath. It extends from the **femoral ring** (its base/proximal opening) to the **saphenous opening** (fossa ovalis) in the fascia lata. **1. Why 1.25 cm is correct:** The femoral canal is approximately **1.25 cm (0.5 inches)** in length. It is a short space that contains loose areolar tissue, lymphatic vessels, and the **lymph node of Cloquet** (or Rosenmüller). Its primary physiological function is to allow the femoral vein to expand during increased venous return from the lower limbs. **2. Analysis of Incorrect Options:** * **2.50 cm (B):** This is roughly the width of the femoral sheath as a whole, but it is too long for the canal itself. * **3.75 cm (C) & 5.00 cm (D):** These distances far exceed the anatomical boundaries of the femoral canal. A 4–5 cm measurement is more characteristic of the **inguinal canal** in adults. **3. High-Yield Clinical Pearls for NEET-PG:** * **Boundaries of the Femoral Ring:** * *Anterior:* Inguinal ligament. * *Posterior:* Pectineal ligament (Cooper’s) and Pectineus muscle. * *Medial:* Lacunar ligament (Gimbernat’s). * *Lateral:* Femoral vein. * **Femoral Hernia:** Because the femoral ring is a point of potential weakness, it is the site for femoral hernias. These are more common in **females** due to a wider pelvis and larger femoral canal. [1] * **Strangulation:** The femoral ring has rigid boundaries (especially the sharp lacunar ligament medially), making femoral hernias highly prone to strangulation compared to inguinal hernias. * **Aberrant Obturator Artery:** In about 20-30% of cases, an enlarged pubic branch of the inferior epigastric artery (the "Crown of Death" or *Corona Mortis*) runs near the lacunar ligament and can be injured during hernia repair.

Question 98: A 23-year-old female long-distance runner presents with a swollen and painful left foot. She reports stepping on an unseen sharp object while running several days ago, leading to symptoms suggestive of tarsal tunnel syndrome. The tarsal tunnel, located on the medial side of the ankle, transmits tendons, vessels, and nerves beneath the laciniate ligament. Which is the most anterior structure passing through this tunnel?

A. Flexor hallucis longus tendon
B. Plantaris tendon
C. Tibialis anterior tendon
D. Tibialis posterior tendon (Correct Answer)

Explanation: Explanation: The **tarsal tunnel** is a fibro-osseous canal located on the posteromedial aspect of the ankle, formed by the medial malleolus, the calcaneus, and the overlying **flexor retinaculum (laciniate ligament)**. The structures passing through the tunnel follow a specific **anterior-to-posterior** (medial-to-lateral) arrangement. The correct sequence is easily remembered by the mnemonic **"Tom, Dick, And Very Nervous Harry"**: 1. **T**ibialis posterior tendon (**Most Anterior**) 2. Flexor **D**igitorum longus tendon 3. Posterior Tibial **A**rtery 4. Posterior Tibial **V**ein 5. Tibial **N**erve 6. Flexor **H**allucis longus tendon (**Most Posterior**) **Analysis of Options:** * **Tibialis posterior tendon (Correct):** It lies immediately behind the medial malleolus, making it the most anterior structure in the tunnel. * **Flexor hallucis longus (Incorrect):** This is the most posterior/deep structure in the tunnel. * **Tibialis anterior (Incorrect):** This tendon is located in the **anterior compartment** of the leg and passes anterior to the ankle joint (extensor retinaculum), not through the tarsal tunnel. * **Plantaris (Incorrect):** The plantaris tendon is located in the superficial posterior compartment and inserts into the calcaneus; it does not enter the tarsal tunnel. **Clinical Pearls for NEET-PG:** * **Tarsal Tunnel Syndrome:** Compression of the **Tibial nerve** within this tunnel leads to pain and paresthesia in the sole of the foot. * The **Flexor Retinaculum** attaches from the medial malleolus to the medial tubercle of the calcaneus. * The **Posterior Tibial Artery** pulse can be palpated midway between the medial malleolus and the heel.

Question 99: Which muscle is the primary abductor of the hip joint?

A. Gluteus maximus
B. Gluteus medius (Correct Answer)
C. Iliacus
D. Adductor magnus

Explanation: **Explanation:** The **Gluteus medius** is the primary abductor of the hip joint. Originating from the outer surface of the ilium and inserting into the lateral surface of the **greater trochanter**, its fibers are ideally positioned to pull the femur away from the midline. Along with the gluteus minimus, it plays a critical role in stabilizing the pelvis during the stance phase of walking by preventing the opposite side of the pelvis from sagging. **Analysis of Incorrect Options:** * **Gluteus maximus:** This is the chief **extensor** and lateral rotator of the hip, primarily used during powerful movements like climbing stairs or rising from a sitting position. * **Iliacus:** Together with the psoas major (forming the Iliopsoas), it is the strongest **flexor** of the hip joint. * **Adductor magnus:** As the name suggests, it is a powerful **adductor** of the thigh; its hamstring part also assists in hip extension. **Clinical Pearls for NEET-PG:** 1. **Trendelenburg Sign:** Paralysis of the gluteus medius (often due to **Superior Gluteal Nerve** injury) leads to a positive Trendelenburg sign, where the pelvis drops on the unsupported side during walking. 2. **Lurching Gait:** To compensate for a weak gluteus medius, the patient tilts their trunk toward the affected side to maintain the center of gravity (Gluteus Medius Gait). 3. **Safe Injection Site:** The gluteus medius is the preferred site for intramuscular injections (upper outer quadrant) to avoid injuring the sciatic nerve.

Question 100: Which of the following muscles is NOT an inverter of the foot?

A. Flexor digitorum longus
B. Peroneus tertius (Correct Answer)
C. Tibialis posterior
D. Tibialis anterior

Explanation: Explanation: Inversion and eversion of the foot occur primarily at the **subtalar and transverse tarsal joints**. The movement of inversion (turning the sole inward) is performed by muscles passing **medial** to the axis of these joints, while eversion is performed by muscles passing **lateral** to it. **Why Peroneus Tertius is the Correct Answer:** Peroneus tertius originates from the lower third of the fibula and inserts onto the dorsal surface of the base of the **5th metatarsal**. Because it passes lateral to the axis of the subtalar joint, it acts as a powerful **everter** of the foot (along with Peroneus longus and brevis) and a dorsiflexor at the ankle. It cannot perform inversion. **Analysis of Incorrect Options:** * **Tibialis Anterior:** The primary inverter and dorsiflexor. It inserts into the medial cuneiform and 1st metatarsal. * **Tibialis Posterior:** The most powerful inverter and a plantarflexor. It has extensive insertions on the navicular tuberosity and other tarsal bones. * **Flexor Digitorum Longus:** As a muscle of the deep posterior compartment, its tendon passes behind the medial malleolus, allowing it to assist in inversion and plantarflexion. **High-Yield Clinical Pearls for NEET-PG:** * **The "Tibialis" Rule:** Both Tibialis Anterior and Posterior are **inverters**. * **The "Peroneus" Rule:** All Peronei (Longus, Brevis, and Tertius) are **everters**. * **Nerve Supply:** Inverters are supplied by the Deep Peroneal (Tibialis Ant.) and Tibial nerves (Tibialis Post., FDL). Everters are supplied by the Superficial Peroneal (Longus/Brevis) and Deep Peroneal nerves (Tertius). * **Clinical Sign:** Injury to the Common Peroneal Nerve leads to "Foot Drop" and loss of eversion, causing the foot to remain in an inverted position (Equinovarus).

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Arterial Supply and Venous Drainage

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Muscles and Their Actions

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Lower Limb — MCQs

Lower Limb — MCQs

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