Lower Limb Practice Questions

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

Femoral artery. **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].

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

Vein, artery, nerve. 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.

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

Deep to superficial. ### 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.

Q: 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?

Tibialis posterior tendon. 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.

Q: Which muscle is the primary abductor of the hip joint?

Gluteus medius. **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.

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

Peroneus tertius. 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).

Q: A 24-year-old female sustained a small-caliber bullet wound to the popliteal fossa. The bullet severed the tibial nerve. What is the most likely functional deficit resulting from this injury?

A dorsiflexed and everted foot. ### Explanation **1. Why Option C is Correct:** The **tibial nerve** (L4-S3) is the larger terminal branch of the sciatic nerve. It supplies the muscles of the **posterior compartment of the leg** (gastrocnemius, soleus, plantaris, popliteus, tibialis posterior, flexor digitorum longus, and flexor hallucis longus) and the intrinsic muscles of the sole. * **Action of Tibial Nerve:** It is responsible for **plantar flexion** (via gastrocnemius/soleus) and **inversion** (via tibialis posterior). * **Effect of Injury:** Paralysis of these muscles leads to an inability to plantar flex and invert the foot. Consequently, the **unopposed action** of the antagonist muscles (supplied by the common peroneal nerve)—the dorsiflexors and everters—pulls the foot into a **dorsiflexed and everted** position (Calcaneovalgus). **2. Why Other Options are Incorrect:** * **Option A:** Extension of the leg at the knee is performed by the quadriceps femoris, supplied by the **femoral nerve**. * **Option B:** **Foot drop** is the hallmark of **common peroneal nerve** injury. It results from the loss of dorsiflexion (deep peroneal nerve) and eversion (superficial peroneal nerve), causing the foot to remain plantar flexed and inverted (Equinovarus). * **Option D:** A plantar flexed and inverted foot describes the deformity seen in common peroneal nerve injury, not tibial nerve injury. **3. Clinical Pearls for NEET-PG:** * **Tarsal Tunnel Syndrome:** Compression of the tibial nerve behind the medial malleolus, causing pain/paresthesia in the sole. * **Mnemonic for Deformity:** * **T**ibial nerve injury = **T**alipes **C**alcaneovalgus (Dorsiflexed/Everted). * **P**eroneal nerve injury = **P**lantar flexion/Equinovarus (Foot Drop). * **Sensory Loss:** In tibial nerve injury at the popliteal fossa, sensation is lost on the **sole of the foot** (medial and lateral plantar nerves).

Q: The femoral nerve supplies all of the following muscles except?

Obturator externus. The **femoral nerve (L2–L4)** is the largest branch of the lumbar plexus, primarily responsible for supplying the muscles of the **anterior compartment of the thigh** and the hip flexors. ### **Why Obturator Externus is the Correct Answer** The **Obturator externus** is located in the medial compartment of the thigh. It is supplied by the **posterior division of the obturator nerve (L2–L4)**, not the femoral nerve. Its primary function is the external rotation of the hip. ### **Analysis of Incorrect Options** * **Pectineus:** This is a "hybrid" or "composite" muscle. It is primarily supplied by the **femoral nerve** (anterior division), though it occasionally receives a small branch from the accessory obturator nerve. * **Sartorius:** Known as the "tailor's muscle," it is the most superficial muscle of the anterior compartment and is supplied by the **anterior division of the femoral nerve**. * **Vastus Medialis:** Part of the Quadriceps femoris group, it is supplied by the **posterior division of the femoral nerve**. Notably, the nerve to the vastus medialis also provides sensory innervation to the knee joint. ### **NEET-PG High-Yield Pearls** * **Divisions:** The femoral nerve divides into anterior and posterior divisions via the **lateral circumflex femoral artery**. * **Sensory Supply:** The anterior division gives off the medial and intermediate cutaneous nerves of the thigh; the posterior division gives off the **saphenous nerve** (the longest cutaneous nerve in the body). * **Clinical Sign:** Injury to the femoral nerve results in the inability to extend the knee and loss of the patellar reflex (Knee jerk). * **Hybrid Muscles of Lower Limb:** Pectineus (Femoral + Obturator), Adductor Magnus (Obturator + Sciatic/Tibial), and Biceps Femoris (Tibial + Common Peroneal).

Q: Which bony landmark of the femur serves as a site for muscle attachments?

lesser trochanter. The **lesser trochanter** is a conical eminence located on the posteromedial aspect of the femur at the junction of the neck and shaft. It serves as the primary insertion site for the **Iliopsoas muscle** (the combined tendon of psoas major and iliacus), which is the most powerful flexor of the hip joint. In anatomy, "trochanters" and "tuberosities" are specifically designed as leverage points for muscle pull. **Analysis of Incorrect Options:** * **A. Fovea Capitis:** This is a small, pit-like depression on the head of the femur. It does not provide muscle attachment; instead, it serves as the attachment site for the **Ligamentum Teres** (ligament of the head of the femur), which carries a small branch of the obturator artery to the femoral head. * **C. Head:** The femoral head is a smooth, globular structure covered in hyaline cartilage designed for articulation with the acetabulum to form the hip joint. It is an articular surface, not a site for muscle attachment. * **D. Medial Condyle:** This is a large, rounded projection at the distal end of the femur. While the *epicondyles* serve as attachment points for ligaments (like the MCL), the condyles themselves are smooth articular surfaces that form the knee joint. **High-Yield Clinical Pearls for NEET-PG:** * **Avulsion Fracture:** In adolescent athletes, sudden forceful contraction of the iliopsoas can lead to an avulsion fracture of the lesser trochanter. * **Psoas Sign:** Pain during hip extension (stretching the iliopsoas) is a classic sign of retrocecal appendicitis. * **Greater Trochanter:** In contrast, the greater trochanter is the insertion site for the gluteus medius, gluteus minimus, and piriformis muscles.

Question 1

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

Accepted Answer

Femoral artery

Answer

Aorta

Answer

External iliac artery

Answer

Internal iliac artery

Question 2

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

Accepted Answer

Vein, artery, nerve

Answer

Nerve, artery, vein

Answer

Artery, vein, nerve

Answer

Nerve, vein, artery

Question 3

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

Accepted Answer

Deep to superficial

Answer

Along gravity

Answer

Superficial to deep

Answer

Along osmotic gradient

Question 4

What is true regarding the hip joint?

Accepted Answer

Medial rotation and abduction are caused by gluteus medius and gluteus minimus.

Answer

Medial rotation and adduction are caused by gluteus medius and gluteus minimus.

Answer

Lateral rotators of the thigh are supplied by the femoral nerve.

Answer

Hyperextension of the hip is prevented by capsular thickening.

Question 5

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?

Accepted Answer

Tibialis posterior tendon

Answer

Flexor hallucis longus tendon

Answer

Plantaris tendon

Answer

Tibialis anterior tendon

Question 6

Which muscle is the primary abductor of the hip joint?

Accepted Answer

Gluteus medius

Answer

Gluteus maximus

Answer

Iliacus

Answer

Adductor magnus

Question 7

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

Accepted Answer

Peroneus tertius

Answer

Flexor digitorum longus

Answer

Tibialis posterior

Answer

Tibialis anterior

Question 8

A 24-year-old female sustained a small-caliber bullet wound to the popliteal fossa. The bullet severed the tibial nerve. What is the most likely functional deficit resulting from this injury?

Accepted Answer

A dorsiflexed and everted foot

Answer

Inability to extend the leg at the knee

Answer

Foot drop

Answer

A plantar flexed and inverted foot

Question 9

The femoral nerve supplies all of the following muscles except?

Accepted Answer

Obturator externus

Answer

Pectineus

Answer

Sartorius

Answer

Vastus medialis

Question 10

Which bony landmark of the femur serves as a site for muscle attachments?

Accepted Answer

lesser trochanter

Answer

fovea capitis

Answer

head

Answer

medial condyle

Lower Limb — MCQs

Lower Limb — MCQs

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