Lower Limb Practice Questions

Q: Third tubercle of the femur provides attachment to which muscle?

Gluteus maximus. ### Explanation The **third tubercle of the femur** (also known as the **gluteal tuberosity**) is a rough, elongated ridge located on the posterior aspect of the proximal femoral shaft, lateral to the pectineal line. It serves as the primary site for the distal insertion of the superficial and inferior fibers of the **Gluteus maximus**. #### Why Option A is Correct: The Gluteus maximus has two main insertions: 1. **Superficial/Superior fibers:** Insert into the **iliotibial tract** (IT band). 2. **Deep/Inferior fibers:** Insert into the **gluteal tuberosity** (third tubercle) of the femur. In some individuals, this tuberosity is significantly enlarged, resembling the third trochanter found in other mammals (like horses). #### Why Other Options are Incorrect: * **B. Gluteus medius:** Inserts onto the lateral surface of the **Greater Trochanter**. * **C. Gluteus minimus:** Inserts onto the anterior surface of the **Greater Trochanter**. * **D. Piriformis:** Inserts onto the apex (superior border) of the **Greater Trochanter**. #### NEET-PG High-Yield Pearls: * **The "Trochanteric" Rule:** Most gluteal muscles and short lateral rotators (Piriformis, Obturators, Gemelli) insert on the **Greater Trochanter**. The Gluteus maximus is the notable exception, inserting lower down on the shaft (gluteal tuberosity). * **Nerve Supply:** Gluteus maximus is the only muscle supplied by the **Inferior Gluteal Nerve (L5, S1, S2)**. * **Clinical Significance:** The Gluteus maximus is the chief extensor of the hip when rising from a sitting position or climbing stairs. Its paralysis results in a "Gluteus Maximus Lurch."

Q: All the following muscles are supplied by the anterior division of the obturator nerve except?

Adductor magnus. **Explanation:** The **obturator nerve (L2–L4)** is the primary nerve of the medial compartment of the thigh. After passing through the obturator canal, it divides into **anterior and posterior divisions**, separated by the adductor brevis muscle. **1. Why Adductor Magnus is the correct answer:** The **Adductor magnus** is a "hybrid" or "composite" muscle with a dual nerve supply. Its **adductor part** is supplied by the **posterior division** of the obturator nerve, while its **hamstring part** is supplied by the **tibial component of the sciatic nerve**. It is never supplied by the anterior division. **2. Analysis of incorrect options (Supplied by the Anterior Division):** * **Adductor longus:** A superficial muscle of the medial compartment, consistently supplied by the anterior division. * **Gracilis:** The most medial muscle of the thigh, supplied by the anterior division. * **Pectineus:** While primarily supplied by the femoral nerve, it frequently receives a branch from the **anterior division** of the obturator nerve (accessory obturator nerve when present). In the context of standard NEET-PG patterns, it is grouped with the anterior division's distribution. **High-Yield Clinical Pearls for NEET-PG:** * **Adductor Brevis:** This muscle acts as the "sandwich filling"; the anterior division runs anterior to it, and the posterior division runs posterior to it. It can be supplied by either or both divisions. * **Obturator Externus:** This is the only muscle supplied by the **trunk** of the obturator nerve (or the posterior division) before it splits significantly. * **Hilton’s Law:** The obturator nerve supplies the hip and knee joints, explaining why hip pathology often presents as referred pain to the medial knee.

Q: During a football game, a 21-year-old wide receiver was illegally blocked by a linebacker, who threw himself against the posterolateral aspect of the runner's left knee. As he lay on the ground, the wide receiver grasped his knee in obvious pain. Which of the following structures is frequently subject to injury from this type of force against the knee?

Anterior cruciate ligament. ### Explanation The clinical scenario describes a classic **"Clipping Injury"** or a blow to the **posterolateral aspect** of the knee. This mechanism of injury results in a force that pushes the femur posteriorly relative to the tibia, or more commonly, creates a **valgus stress** combined with internal rotation. **1. Why the Anterior Cruciate Ligament (ACL) is correct:** The ACL is the primary stabilizer preventing anterior translation of the tibia on the femur. When a force is applied to the posterolateral aspect of the knee, it often results in a **valgus strain**. This puts immense tension on the "Unhappy Triad" (O'Donoghue's Triad), which consists of the **Anterior Cruciate Ligament**, **Medial Collateral Ligament (MCL)**, and the **Medial Meniscus** (though recent studies suggest the lateral meniscus is more commonly injured in acute ACL tears). The ACL is the most frequently ruptured of these structures in contact sports involving sudden deceleration or lateral impact. **2. Why the other options are incorrect:** * **Option A (Fibular collateral ligament):** The FCL (Lateral Collateral Ligament) is injured by a **varus force** (impact to the medial side of the knee), not a lateral/valgus force. * **Option C & D (Posterior Cruciate Ligament):** The PCL is typically injured by a direct blow to the **anterior** aspect of the proximal tibia (e.g., "Dashboard injury") or extreme hyperextension. It is much stronger than the ACL and less likely to be injured by a posterolateral blow. ### NEET-PG High-Yield Pearls: * **Unhappy Triad (O'Donoghue):** ACL + MCL + Medial Meniscus (Classic teaching) or Lateral Meniscus (Modern clinical finding). * **Lachman Test:** The most sensitive clinical test for an acute ACL tear. * **Pivot Shift Test:** Most specific test for ACL deficiency. * **Segond Fracture:** An avulsion fracture of the lateral tibial condyle; it is pathognomonic for an ACL tear.

Q: Which of the following is NOT seen in injury to the common peroneal nerve?

Loss of sensation over the sole. The **Common Peroneal Nerve (CPN)**, also known as the common fibular nerve, is the most frequently injured nerve in the lower limb due to its superficial course around the **neck of the fibula**. ### **Why Option A is the Correct Answer** Loss of sensation over the **sole of the foot** is a feature of **Tibial Nerve** injury, not CPN injury. The tibial nerve gives off the medial and lateral plantar nerves, which provide sensory innervation to the sole. In contrast, the CPN (via its superficial branch) provides sensation to the lateral side of the leg and the dorsum of the foot. ### **Analysis of Other Options** * **Option B (Foot Drop):** The CPN divides into the Deep Peroneal Nerve (DPN) and Superficial Peroneal Nerve (SPN). The DPN supplies the anterior compartment muscles (dorsiflexors). Paralysis of these muscles leads to the inability to lift the foot, resulting in **foot drop**. * **Option C (Neck of Fibula):** This is the most common site of injury because the nerve winds tightly around the fibular neck, making it vulnerable to fractures, tight casts, or compression. * **Option D (Loss of dorsiflexion of toes):** The DPN supplies the *Extensor Hallucis Longus* and *Extensor Digitorum Longus*. Injury to the CPN results in the loss of extension (dorsiflexion) of the toes. ### **High-Yield Clinical Pearls for NEET-PG** * **Gait:** Patients with CPN injury exhibit a **"High Steppage Gait"** to prevent the toes from dragging. * **Sensory Loss:** The pathognomonic sensory loss for Deep Peroneal Nerve injury is the **first web space** (between the 1st and 2nd toes). * **Mnemonic (PED):** **P**eroneal **E**verts and **D**orsiflexes; if injured, the foot is **D**ropped and **I**nverted (due to unopposed Tibialis Posterior).

Q: The oblique popliteal ligament is pierced by which artery?

Middle genicular branch of the popliteal artery. Explanation: The **oblique popliteal ligament** is an expansion of the tendon of the semimembranosus muscle. It strengthens the posterior part of the knee joint capsule. The **Middle Genicular Artery (MGA)** is a small branch arising from the anterior aspect of the popliteal artery. It is the specific vessel that **pierces the oblique popliteal ligament** to enter the knee joint. Once inside, it supplies the cruciate ligaments (ACL and PCL) and the synovial membrane. This is a classic anatomical landmark frequently tested in postgraduate exams. **Analysis of Incorrect Options:** * **Option A (Anterior branch):** The popliteal artery divides into anterior and posterior tibial arteries at the lower border of the popliteus muscle; it does not have a specific "anterior branch" that pierces this ligament. * **Option B & C (Medial inferior/superior genicular branches):** These arteries wind around the medial side of the femur and tibia, respectively. They participate in the genicular anastomosis around the knee but do not pierce the posterior ligamentous structures. **High-Yield Clinical Pearls for NEET-PG:** * **The "Middle" Rule:** The middle genicular artery supplies the **middle** structures of the knee (cruciate ligaments). * **Nerve Supply:** Along with the MGA, the **genicular branch of the posterior division of the obturator nerve** also pierces the oblique popliteal ligament to provide sensory innervation to the joint. * **Origin:** The oblique popliteal ligament arises from the **semimembranosus** tendon, while the arcuate popliteal ligament is associated with the head of the fibula.

Q: The patellar plexus is formed by which nerve?

All of the above. The **patellar plexus** is a fine network of nerves situated in the subcutaneous tissue in front of the patella, ligamentum patellae, and the upper end of the tibia. It serves as the primary sensory supply to the skin overlying the anterior aspect of the knee. ### **Explanation of the Correct Answer** The correct answer is **D (All of the above)** because the patellar plexus is formed by the terminal communication of four specific nerves: 1. **Lateral Cutaneous Nerve of Thigh:** Specifically its anterior branch. 2. **Intermediate Cutaneous Nerve of Thigh:** A branch of the femoral nerve. 3. **Medial Cutaneous Nerve of Thigh:** Specifically its anterior division (also a branch of the femoral nerve). 4. **Infrapatellar branch of the Saphenous Nerve:** This is a crucial contributor from the medial side. Since options A, B, and C are all primary contributors to this plexus, "All of the above" is the most accurate choice. ### **Analysis of Options** * **Option A, B, and C:** While each of these nerves contributes to the plexus, selecting any one individually would be incomplete. The plexus is a collective anastomosis of these three nerves along with the infrapatellar branch of the saphenous nerve. ### **High-Yield Clinical Pearls for NEET-PG** * **Nerve Supply:** Remember that the patellar plexus is purely **sensory**. * **Surgical Significance:** During total knee arthroplasty (TKA) or midline incisions of the knee, the **infrapatellar branch of the saphenous nerve** is the most commonly injured nerve, leading to numbness or paresthesia on the anterolateral aspect of the leg. * **Root Values:** The femoral nerve (L2, L3, L4) provides the intermediate and medial cutaneous nerves, while the lateral cutaneous nerve of the thigh arises directly from the lumbar plexus (L2, L3).

Q: All of the following are true about the lateral cutaneous nerve of the thigh EXCEPT:

Supplies skin over the medial aspect of the thigh. The **Lateral Cutaneous Nerve of the Thigh (LCNT)** is a branch of the lumbar plexus that provides sensory innervation to the lower limb. ### **Explanation of Options** * **Correct Answer (B):** This statement is false. The LCNT supplies the skin over the **lateral** aspect of the thigh down to the knee. The medial aspect of the thigh is supplied by the **obturator nerve** and the **medial cutaneous nerve of the thigh** (a branch of the femoral nerve). * **Option A:** This is true. Its primary function is to provide sensation to the lateral thigh. * **Option C:** This is true. It arises from the **posterior divisions of the ventral rami of L2 and L3** spinal nerves. * **Option D:** This is true. The LCNT is a **purely sensory nerve**; it does not supply any muscles. ### **Clinical Pearls for NEET-PG** * **Meralgia Paraesthetica:** This is a high-yield clinical condition caused by the compression of the LCNT as it passes under or through the **inguinal ligament** (medial to the anterior superior iliac spine). It presents as tingling, numbness, or burning pain on the outer thigh. * **Risk Factors:** Obesity, tight clothing (belts), pregnancy, and diabetes are common triggers for compression. * **Anatomical Course:** It emerges from the lateral border of the psoas major muscle, crosses the iliacus, and enters the thigh deep to the inguinal ligament. * **Differential Diagnosis:** Unlike femoral nerve palsy, Meralgia Paraesthetica involves **no motor weakness** and no loss of the knee-jerk reflex, because the LCNT is purely sensory.

Q: Which of the following are part of the Hamstrings?

Semitendinosus, Semimembranosus. To be classified as a **true hamstring muscle**, a muscle must fulfill four specific criteria: it must originate from the **ischial tuberosity**, insert into one of the bones of the leg (tibia or fibula), be innervated by the **tibial part of the sciatic nerve**, and act as a flexor of the knee and extensor of the hip. ### **Analysis of Options** * **Correct Answer (B):** Both **Semitendinosus** and **Semimembranosus** satisfy all four criteria. Along with the **Long head of Biceps Femoris**, they form the true hamstring group. * **Option A & C (Gracilis):** While the Gracilis inserts into the *Pes Anserinus* (alongside the semitendinosus), it is an adductor of the thigh, originates from the pubis, and is supplied by the **obturator nerve**. * **Option D (Short head of Biceps Femoris):** This is the most common "trap" in NEET-PG. The short head originates from the **linea aspera** (not the ischial tuberosity) and is supplied by the **common peroneal** (fibular) part of the sciatic nerve. It is considered a "modified" hamstring. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Adductor Magnus (Ischial part):** Also known as the "Hamstring part" of the adductor magnus. It originates from the ischial tuberosity and is supplied by the tibial nerve, but it does not cross the knee joint. 2. **Pes Anserinus ("Say Grace before Tea"):** The common insertion on the medial condyle of the tibia for **S**artorius, **G**racilis, and **S**emitendinosus. 3. **Action:** Hamstrings are the primary flexors of the knee. During walking, they act as dynamic stabilizers to prevent hyperextension. 4. **Nerve Supply:** The sciatic nerve (L4–S3) supplies all hamstrings. A lesion to the tibial component spares only the short head of the biceps femoris.

Q: Which structure primarily supports the medial longitudinal arch of the foot?

Plantar fascia. The medial longitudinal arch is the highest and most important arch of the foot. Its integrity is maintained by a combination of bony shapes, ligaments, and muscles. **Why Plantar Fascia is correct:** The **plantar fascia (plantar aponeurosis)** is the most important **passive stabilizer** of the foot. It acts like a "tie-beam" connecting the two ends of the arch (calcaneus and metatarsal heads). During the toe-off phase of walking, the **Windlass Mechanism** occurs: extension of the toes tightens the plantar fascia, shortening the distance between the heel and forefoot, thereby elevating and supporting the medial longitudinal arch. **Analysis of Incorrect Options:** * **B. Sustentaculum tali:** This is a bony projection of the calcaneus that supports the talus. While it serves as a pulley for the Flexor Hallucis Longus, it is a bony feature, not the primary supportive structure. * **C. Peroneus longus:** This muscle helps maintain the **lateral** and **transverse** arches. While it crosses to the medial side to insert on the first metatarsal, its primary role is not the main support of the medial arch. * **D. Peroneus brevis:** This muscle inserts into the base of the 5th metatarsal and primarily acts as an evertor; it does not support the medial arch. **High-Yield Clinical Pearls for NEET-PG:** * **Spring Ligament (Plantar Calcaneonavicular):** This is the most important **ligamentous** support (the "mainstay") of the medial arch. If "Plantar Fascia" is not an option, Spring Ligament is often the answer. * **Tibialis Posterior:** Known as the "dynamic stabilizer" or the most important **muscular** support of the medial arch. Its failure leads to acquired flat foot (Pes Planus). * **Keystone of the arch:** The **Head of the Talus** is the keystone of the medial longitudinal arch.

Q: A 27-year-old male athlete experiences deep calf pain that almost causes him to drop out of a competition. Doppler ultrasound and surgical exposure reveal an accessory portion of the medial head of the gastrocnemius constricting the popliteal artery. The superior medial border of the popliteal fossa is located above the medial head of the gastrocnemius. Which of the following structures forms this border?

Tendons of semitendinosus and semimembranosus. **Explanation:** The question describes a classic case of **Popliteal Artery Entrapment Syndrome (PAES)**, where an anatomical variation (usually an anomalous medial head of the gastrocnemius) compresses the popliteal artery. To answer this, one must identify the anatomical boundaries of the **popliteal fossa**, a diamond-shaped space behind the knee. **1. Why the Correct Answer is Right:** The popliteal fossa is bounded superiorly by the divergent hamstring muscles and inferiorly by the convergent heads of the gastrocnemius. * **Superior-Medial Border:** Formed by the **semitendinosus and semimembranosus** muscles. * **Superior-Lateral Border:** Formed by the **biceps femoris**. * **Inferior-Medial Border:** Formed by the medial head of the gastrocnemius. * **Inferior-Lateral Border:** Formed by the lateral head of the gastrocnemius and the plantaris. **2. Analysis of Incorrect Options:** * **Option A (Biceps femoris):** This forms the **superior-lateral** border of the fossa. * **Option C (Plantaris):** This muscle contributes to the **inferior-lateral** border, lying deep to the lateral head of the gastrocnemius. * **Option D (Adductor hiatus):** This is the opening in the adductor magnus through which the femoral artery enters the popliteal fossa to become the popliteal artery. It is the *inlet* to the fossa, not a superficial boundary. **Clinical Pearls for NEET-PG:** * **Popliteal Artery Entrapment Syndrome (PAES):** Most commonly due to the medial head of the gastrocnemius arising more laterally than normal. It presents as intermittent claudication in young athletes. * **Contents of Popliteal Fossa (Medial to Lateral):** Popliteal artery (deepest), Popliteal vein, and Tibial nerve (most superficial). * **Floor of the Fossa:** Formed by the popliteal surface of the femur, the capsule of the knee joint (oblique popliteal ligament), and the popliteus fascia.

Question 1

Third tubercle of the femur provides attachment to which muscle?

Accepted Answer

Gluteus maximus

Answer

Gluteus medius

Answer

Gluteus minimis

Answer

Piriformis

Question 2

All the following muscles are supplied by the anterior division of the obturator nerve except?

Accepted Answer

Adductor magnus

Answer

Pectineus

Answer

Adductor longus

Answer

Gracilis

Question 3

During a football game, a 21-year-old wide receiver was illegally blocked by a linebacker, who threw himself against the posterolateral aspect of the runner's left knee. As he lay on the ground, the wide receiver grasped his knee in obvious pain. Which of the following structures is frequently subject to injury from this type of force against the knee?

Accepted Answer

Anterior cruciate ligament

Answer

Fibular collateral ligament

Answer

Lateral meniscus and posterior cruciate ligament

Answer

Fibular collateral and posterior cruciate ligament

Question 4

Which of the following is NOT seen in injury to the common peroneal nerve?

Accepted Answer

Loss of sensation over the sole

Answer

Foot drop

Answer

Injury to the neck of the fibula is a common cause

Answer

Loss of dorsiflexion of the toes

Question 5

The oblique popliteal ligament is pierced by which artery?

Accepted Answer

Middle genicular branch of the popliteal artery

Answer

Anterior branch of the popliteal artery

Answer

Medial inferior genicular branch of the popliteal artery

Answer

Medial superior genicular branch of the popliteal artery

Question 6

The patellar plexus is formed by which nerve?

Accepted Answer

All of the above

Answer

Lateral cutaneous nerve

Answer

Intermediate cutaneous nerve

Answer

Medial cutaneous nerve

Question 7

All of the following are true about the lateral cutaneous nerve of the thigh EXCEPT:

Accepted Answer

Supplies skin over the medial aspect of the thigh

Answer

Supplies skin over the lateral aspect of the thigh

Answer

Arises from L2 and L3 spinal nerves

Answer

It is a purely sensory nerve

Question 8

Which of the following are part of the Hamstrings?

Accepted Answer

Semitendinosus, Semimembranosus

Answer

Semimembranosus, Gracilis

Answer

Semitendinosus, Gracilis

Answer

Semimembranosus, Short head of biceps femoris

Question 9

Which structure primarily supports the medial longitudinal arch of the foot?

Accepted Answer

Plantar fascia

Answer

Sustentaculum tali

Answer

Peroneus longus

Answer

Peroneus brevis

Question 10

A 27-year-old male athlete experiences deep calf pain that almost causes him to drop out of a competition. Doppler ultrasound and surgical exposure reveal an accessory portion of the medial head of the gastrocnemius constricting the popliteal artery. The superior medial border of the popliteal fossa is located above the medial head of the gastrocnemius. Which of the following structures forms this border?

Accepted Answer

Tendons of semitendinosus and semimembranosus

Answer

Tendon of biceps femoris

Answer

Tendon of plantaris

Answer

Tendinous hiatus of adductor magnus

Lower Limb — MCQs

Lower Limb — MCQs

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