Lower Limb Practice Questions

Q: The sustentaculum tali is present on which bone?

Calcaneus. The **sustentaculum tali** is a shelf-like bony projection located on the **medial surface** of the **calcaneus** (the heel bone). Its primary function is to support the head of the talus, which sits directly above it. ### Why Calcaneus is Correct: The sustentaculum tali acts as a structural pedestal. Its superior surface has an articular facet for the middle calcaneal facet of the talus. Crucially, its inferior surface features a groove for the **Flexor Hallucis Longus (FHL)** tendon, which uses the projection as a pulley. ### Why Other Options are Incorrect: * **Talus:** While the sustentaculum tali supports the talus, it is not part of it. The talus is the only tarsal bone with no muscular attachments. * **Navicular:** This bone lies anterior to the talus. It features a prominent **tuberosity** (insertion for Tibialis Posterior), not the sustentaculum. * **Cuneiform:** These are three small bones (medial, intermediate, lateral) in the midfoot that articulate with the metatarsals; they lack major shelf-like projections. ### High-Yield Clinical Pearls for NEET-PG: * **Spring Ligament:** The plantar calcaneonavicular (spring) ligament attaches to the sustentaculum tali. It supports the medial longitudinal arch; its failure leads to **flat foot (pes planus)**. * **Tarsal Tunnel:** The sustentaculum tali forms part of the floor of the tarsal tunnel. * **Mnemonic for Medial Malleolus structures (Front to Back):** **T**ibialis posterior, flexor **D**igitorum longus, posterior tibial **A**rtery, tibial **N**erve, flexor **H**allucis longus (**T**om, **D**ick **A**nd **N**ervous **H**arry). Remember: FHL is the deepest and passes under the sustentaculum tali.

Q: Which of the following forms the medial boundary of the lacunar ligament?

Lacunar ligament. The question focuses on the boundaries of the **femoral ring**, which is the upper opening of the femoral canal. Understanding these boundaries is high-yield for NEET-PG, particularly in the context of femoral hernias. ### **Explanation of the Correct Answer** The **lacunar ligament** (Gimbernat’s ligament) is a triangular extension of the medial end of the inguinal ligament. It attaches to the pectineal line of the pubis. In the context of the femoral ring: * **Medial Boundary:** Formed by the sharp, crescentic edge of the **lacunar ligament**. * **Lateral Boundary:** Formed by the **femoral vein** (separated by a septum). * **Anterior Boundary:** Formed by the **inguinal ligament** [1]. * **Posterior Boundary:** Formed by the **pectineal ligament** (Cooper’s ligament) and the **pectineus muscle** covering the superior ramus of the pubis [1]. ### **Analysis of Incorrect Options** * **B. Inguinal Ligament:** This forms the **anterior** boundary of the femoral ring. * **C. Femoral Vein:** This forms the **lateral** boundary of the femoral ring. * **D. Pectineus Muscle:** This (along with its fascia and the pectineal ligament) forms the **posterior** boundary. ### **Clinical Pearls for NEET-PG** 1. **Femoral Hernia:** Because the lacunar ligament is rigid and unyielding, it is the structure responsible for the **strangulation** of femoral hernias [1]. To release a strangulated hernia, the lacunar ligament is often incised. 2. **Corona Mortis:** An accessory obturator artery may run along the superior surface of the lacunar ligament. Surgeons must be cautious during hernia repair to avoid life-threatening hemorrhage. 3. **Femoral Canal Contents:** It contains lymph nodes (Node of Cloquet or Rosenmüller), lymphatics, and areolar tissue.

Q: The neurovascular bundle of the anterior compartment of the leg passes between the tendons of which muscles?

Extensor hallucis longus and Extensor digitorum longus. ### Explanation The neurovascular bundle of the anterior compartment of the leg consists of the **Deep Peroneal Nerve** and the **Anterior Tibial Artery**. Understanding its anatomical course is crucial for identifying structures during surgery or in trauma cases like compartment syndrome. **Why Option A is Correct:** In the upper part of the leg, the neurovascular bundle lies between the **Tibialis anterior** and **Extensor digitorum longus (EDL)**. However, as it descends toward the ankle, the **Extensor hallucis longus (EHL)** crosses the bundle from lateral to medial. Consequently, in the lower third of the leg (just above the extensor retinaculum), the bundle is positioned specifically between the **tendons of EHL (medially)** and **EDL (laterally)**. This is the standard anatomical landmark often tested in exams. **Analysis of Incorrect Options:** * **Option B:** The Peroneus tertius is a small muscle often continuous with the EDL; the bundle does not pass between them. * **Option C:** This describes the relationship in the middle of the leg, but at the level of the ankle (where tendons are most prominent), the EHL has moved medially, placing the bundle between EHL and EDL. * **Option D:** This describes the relationship in the upper third of the leg before the EHL muscle belly becomes the primary medial boundary. **NEET-PG High-Yield Pearls:** * **Nerve Supply:** The Deep Peroneal Nerve (L4-S1) supplies all muscles of the anterior compartment. Injury leads to **Foot Drop**. * **Surface Marking:** The Anterior Tibial Artery continues as the **Dorsalis Pedis Artery** midway between the two malleoli, lateral to the EHL tendon. * **Clinical Correlation:** The anterior compartment is the most common site for **Acute Compartment Syndrome** in the leg. The first sign of nerve involvement is often sensory loss in the **first web space**.

Q: Which of the following is NOT a flexor of the hip joint?

Gluteus maximus. **Explanation:** The hip joint is a multiaxial ball-and-socket joint where movement is determined by the muscle's position relative to the joint's axis. **Why Gluteus Maximus is the correct answer:** The **Gluteus maximus** is the chief **extensor** of the hip joint, not a flexor. It is located posterior to the joint axis and is particularly active during powerful movements like climbing stairs, running, or rising from a sitting position. It also acts as a lateral rotator of the thigh. **Analysis of incorrect options (Flexors of the Hip):** * **Psoas major:** This is the **primary and most powerful flexor** of the hip. Along with the Iliacus (forming the Iliopsoas), it is essential for lifting the limb during walking. * **Sartorius:** Known as the "tailor's muscle," it is a multi-joint muscle that acts as a flexor, abductor, and lateral rotator of the hip, as well as a flexor of the knee. * **Rectus femoris:** As part of the Quadriceps femoris, it is the only head that crosses the hip joint (originating from the AIIS), making it a potent hip flexor and knee extensor. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Hip Flexor:** Iliopsoas (Psoas major + Iliacus). * **Primary Hip Extensor:** Gluteus maximus. * **Primary Hip Abductor:** Gluteus medius (Trendelenburg sign occurs if paralyzed). * **Nerve Supply:** Gluteus maximus is supplied by the **Inferior Gluteal Nerve (L5, S1, S2)**, while the Gluteus medius and minimus are supplied by the Superior Gluteal Nerve. * **Thomas Test:** Used clinically to assess fixed flexion deformity of the hip.

Q: Which muscle is supplied by the inferior gluteal nerve?

Gluteus maximus. The **inferior gluteal nerve (L5, S1, S2)** is a branch of the sacral plexus that provides motor innervation to only one muscle: the **Gluteus maximus**. This muscle is the largest and most superficial of the gluteal group, acting as the primary extensor of the hip joint. ### Analysis of Options: * **Gluteus maximus (Correct):** It is the sole muscle supplied by the inferior gluteal nerve. It is essential for powerful movements like climbing stairs or rising from a sitting position. * **Obturator externus (Incorrect):** This muscle belongs to the medial compartment of the thigh and is supplied by the **posterior division of the obturator nerve (L3, L4)**. * **Gluteus medius (Incorrect):** Along with the gluteus minimus and tensor fasciae latae, it is supplied by the **superior gluteal nerve (L4, L5, S1)**. * **Quadratus femoris (Incorrect):** This is supplied by its own dedicated nerve, the **nerve to quadratus femoris (L4, L5, S1)**, which also supplies the inferior gemellus. ### High-Yield Clinical Pearls for NEET-PG: * **Trendelenburg Sign:** Damage to the **superior gluteal nerve** leads to paralysis of the gluteus medius and minimus, causing the pelvis to drop on the unsupported (opposite) side during walking. * **Gluteus Maximus Gait:** Damage to the **inferior gluteal nerve** results in difficulty extending the hip. Patients compensate by leaning their trunk backward during the heel-strike phase to maintain balance. * **Nerve Roots:** Remember the "Superior is Higher" rule: Superior gluteal (L4-S1) vs. Inferior gluteal (L5-S2).

Q: Extensor hallucis longus is supplied by which nerve?

Deep peroneal nerve. ### Explanation The **Extensor Hallucis Longus (EHL)** is a muscle located in the **anterior compartment** of the leg. The fundamental anatomical principle to remember for the lower limb is that each compartment has a specific nerve supply. **1. Why Deep Peroneal Nerve is Correct:** The anterior compartment of the leg (which includes the Tibialis Anterior, Extensor Digitorum Longus, Extensor Hallucis Longus, and Peroneus Tertius) is exclusively supplied by the **Deep Peroneal Nerve** (L4, L5, S1), a branch of the Common Peroneal Nerve. This nerve is often referred to as the "nerve of the anterior compartment." **2. Why Other Options are Incorrect:** * **Superficial Peroneal Nerve:** This nerve supplies the **lateral compartment** of the leg (Peroneus Longus and Brevis). It primarily handles eversion of the foot. * **Tibial Nerve:** This nerve supplies the **posterior compartment** of the leg (e.g., Gastrocnemius, Soleus, Tibialis Posterior). These muscles are responsible for plantarflexion and toe flexion. * **Sciatic Nerve:** This is the parent nerve that divides into the Tibial and Common Peroneal nerves in the popliteal fossa. It does not directly supply the muscles of the leg. **Clinical Pearls for NEET-PG:** * **Foot Drop:** Injury to the Common Peroneal Nerve (often at the neck of the fibula) or the Deep Peroneal Nerve leads to "Foot Drop" due to paralysis of the anterior compartment muscles (including EHL). * **Testing EHL:** To clinically test the **L5 nerve root**, ask the patient to perform resisted extension of the great toe. * **Anterior Compartment Syndrome:** The Deep Peroneal Nerve can be compressed in this syndrome, leading to sensory loss in the **first web space** of the foot (a high-yield diagnostic sign).

Q: Which of the following muscles plays an important role in lifting the left foot off the ground while walking?

Right gluteus medius. ### Explanation The correct answer is **Right gluteus medius**. #### 1. The Underlying Concept: Pelvic Stability during Gait To lift the **left foot** off the ground (the "swing phase"), the body must balance on the **right leg** (the "stance phase"). When the left foot is raised, gravity naturally tends to pull the unsupported left side of the pelvis downward. To prevent this pelvic tilt and allow the left foot to clear the ground, the **abductors of the supporting hip** (primarily the **Right Gluteus Medius** and **Gluteus Minimus**) must contract. This contraction pulls the pelvis down on the right side, effectively counter-levering and elevating the pelvis on the left side. #### 2. Analysis of Incorrect Options * **A. Left gluteus medius:** This muscle is relaxed during the left swing phase. If it were the supporting leg (right foot lifted), the left gluteus medius would be the primary stabilizer. * **B. Left gluteus maximus:** This is the chief extensor of the hip, used for climbing stairs or rising from a sitting position; it does not provide lateral pelvic stability. * **C. Right adductor longus:** Adductors move the limb toward the midline. They do not prevent the pelvic drop required for foot clearance. #### 3. Clinical Pearls for NEET-PG * **Trendelenburg Sign:** If the right superior gluteal nerve or gluteus medius is damaged, the pelvis will drop on the **opposite (left) side** when standing on the right leg. This is a "Positive Trendelenburg Sign." * **Trendelenburg Gait (Lurching Gait):** To compensate for this drop, the patient tilts their trunk toward the **affected side** (the side they are standing on) to shift the center of gravity. * **Nerve Supply:** Both the gluteus medius and minimus are supplied by the **Superior Gluteal Nerve (L4, L5, S1)**. Injury to this nerve (e.g., via misplaced intramuscular injections) is the most common cause of this gait abnormality.

Q: Which muscle is attached to the navicular tuberosity?

Tibialis posterior. Explanation: The **Tibialis posterior** is the principal invertor and stabilizer of the medial longitudinal arch of the foot. Its insertion is extensive to ensure structural support; the primary (superficial) portion of its tendon inserts directly onto the **tuberosity of the navicular bone** and the medial cuneiform. This specific attachment point is a frequent high-yield target in anatomy exams. Analysis of Options: * **Tibialis anterior (A):** Inserts onto the medial and plantar surfaces of the **medial cuneiform** and the base of the **1st metatarsal**. It is the primary dorsiflexor of the foot. * **Peroneus longus (C):** Passes under the foot to insert onto the lateral side of the **medial cuneiform** and the base of the **1st metatarsal**. It acts as an antagonist to the Tibialis anterior regarding eversion/inversion. * **Extensor hallucis longus (D):** Inserts onto the base of the **distal phalanx of the great toe**. Its primary action is the extension of the big toe and dorsiflexion of the ankle. Clinical Pearls for NEET-PG: 1. **Medial Longitudinal Arch:** The Tibialis posterior is the "dynamic stabilizer" of this arch. Dysfunction or rupture of its tendon leads to **Acquired Flatfoot (Pes Planus)**. 2. **Accessory Navicular:** Occasionally, a secondary ossification center exists near the navicular tuberosity (Os Tibiale Externum), which can cause pain due to Tibialis posterior tension. 3. **Tom, Dick, and Harry:** Remember the order of structures passing behind the medial malleolus (Ant to Post): **T**ibialis posterior, flexor **D**igitorum longus, posterior tibial **A**rtery, tibial **N**erve, and flexor **H**allucis longus.

Q: Which of the following tendons is more likely to rupture during violent dorsiflexion of the foot?

Plantaris tendon. The **Plantaris tendon** is the correct answer due to its unique anatomical and functional characteristics. Often referred to as the "Freshman’s Nerve" (because it can be mistaken for a nerve by first-year students), it is a vestigial muscle with a very long, thin, and cord-like tendon. **Why it ruptures:** The plantaris muscle crosses two joints (knee and ankle). During **violent dorsiflexion** of the foot—especially when the knee is simultaneously extended—the tendon is subjected to extreme eccentric loading. Because it is thin and has relatively low tensile strength compared to the robust Achilles or extrinsic extensor tendons, it is prone to sudden rupture. This clinical scenario is often called **"Tennis Leg,"** characterized by a sudden "pop" and sharp pain in the calf, mimicking a more severe Achilles rupture or a gastrocnemius tear. **Analysis of Incorrect Options:** * **A & B (EHL and EDL):** These are anterior compartment muscles. Their primary action is dorsiflexion. They are under tension during plantarflexion, not dorsiflexion. Ruptures of these tendons are rare and usually result from direct trauma or lacerations. * **C (FHL):** While the FHL is a posterior muscle, it is a thick, powerful tendon. It is more commonly associated with chronic "Stenosing Tenosynovitis" (Dancer’s Tendonitis) in ballet dancers rather than acute rupture during dorsiflexion. **High-Yield Clinical Pearls for NEET-PG:** * **Tennis Leg:** Classically involves the rupture of the plantaris tendon or the medial head of the gastrocnemius. * **Graft Source:** Despite its propensity to rupture, the plantaris tendon is a common source for **autologous tendon grafting** (e.g., for hand surgery) because its absence does not result in functional deficit. * **Anatomy:** It is absent in approximately 7–10% of the population.

Question 1

The sustentaculum tali is present on which bone?

Accepted Answer

Calcaneus

Answer

Talus

Answer

Navicular

Answer

Cuneiform

Question 2

Which of the following forms the medial boundary of the lacunar ligament?

Accepted Answer

Lacunar ligament

Answer

Inguinal ligament

Answer

Femoral vein

Answer

Pectineus muscle

Question 3

The neurovascular bundle of the anterior compartment of the leg passes between the tendons of which muscles?

Accepted Answer

Extensor hallucis longus and Extensor digitorum longus

Answer

Extensor digitorum longus and peroneus tertius

Answer

Tibialis anterior and Extensor hallucis longus

Answer

Tibialis anterior and Extensor digitorum longus

Question 4

Which of the following is NOT a flexor of the hip joint?

Accepted Answer

Gluteus maximus

Answer

Psoas major

Answer

Sartorius

Answer

Rectus femoris

Question 5

What is true regarding knee movements?

Accepted Answer

The posterior horn of the menisci moves more than the anterior horn.

Answer

Flexion is coupled with lateral rotation.

Answer

There is differential motion in the lateral and medial compartments.

Answer

In full extension, the collateral ligaments are taut.

Question 6

Which muscle is supplied by the inferior gluteal nerve?

Accepted Answer

Gluteus maximus

Answer

Obturator externus

Answer

Gluteus medius

Answer

Quadratus femoris

Question 7

Extensor hallucis longus is supplied by which nerve?

Accepted Answer

Deep peroneal nerve

Answer

Superficial peroneal nerve

Answer

Tibial nerve

Answer

Sciatic nerve

Question 8

Which of the following muscles plays an important role in lifting the left foot off the ground while walking?

Accepted Answer

Right gluteus medius

Answer

Left gluteus medius

Answer

Left gluteus maximus

Answer

Right adductor longus

Question 9

Which muscle is attached to the navicular tuberosity?

Accepted Answer

Tibialis posterior

Answer

Tibialis anterior

Answer

Peroneus longus

Answer

Extensor hallucis longus

Question 10

Which of the following tendons is more likely to rupture during violent dorsiflexion of the foot?

Accepted Answer

Plantaris tendon

Answer

Extensor hallucis longus (EHL)

Answer

Extensor digitorum longus (EDL)

Answer

Flexor hallucis longus (FHL)

Lower Limb — MCQs

Lower Limb — MCQs

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