Lower Limb Practice Questions

Q: By which nerve is the hip joint supplied?

Femoral. **Explanation:** The nerve supply to the hip joint follows **Hilton’s Law**, which states that the nerve supplying the muscles extending across a joint also supplies the joint itself. The hip joint receives a rich sensory innervation from several nerves derived from the lumbar and sacral plexuses. **Why Femoral Nerve is Correct:** The **Femoral nerve (L2-L4)** provides sensory branches to the anterior aspect of the hip joint (specifically via the nerve to the rectus femoris). Other major contributors to the hip joint include the **Obturator nerve** (medial/inferior aspect) and the **Superior gluteal nerve** (superior aspect). In the context of the given options, the Femoral nerve is the primary and correct choice. **Analysis of Incorrect Options:** * **Deep Peroneal Nerve:** This is a branch of the common peroneal nerve that supplies the anterior compartment of the leg and the dorsum of the foot. It does not reach the hip. * **Sciatic Nerve:** While the nerve to the quadratus femoris (a branch of the sacral plexus often associated with the sciatic nerve complex) supplies the posterior hip joint, the main trunk of the Sciatic nerve itself is generally not cited as the primary articular supply in standard textbooks. * **Posterior Cutaneous Nerve of Thigh:** This is a purely sensory nerve supplying the skin of the posterior thigh and popliteal fossa; it does not provide articular branches to the hip joint. **High-Yield Clinical Pearls for NEET-PG:** * **Referred Pain:** Due to the shared innervation by the **Femoral and Obturator nerves**, pathology in the hip joint (like Perthes disease or OA) often presents as **referred pain to the knee**. * **Hilton's Law Application:** Always remember that the nerves supplying the muscles moving the joint (Flexors: Femoral; Adductors: Obturator; Abductors: Superior Gluteal) all contribute to the joint's nerve supply.

Q: At its origin, the profunda femoris artery lies on which side of the femoral artery?

Lateral. The **profunda femoris artery** (deep artery of the thigh) is the largest branch of the femoral artery and serves as the primary blood supply to the muscles of all three thigh compartments. ### **Explanation of the Correct Answer** The profunda femoris artery arises from the **lateral aspect** of the femoral artery, approximately 3.5–4 cm below the inguinal ligament within the femoral triangle. * **Initial Course:** At its origin, it lies **lateral** to the femoral artery. * **Subsequent Course:** As it descends, it passes **posterior** to the femoral artery and femoral vein to reach the medial side of the femur, eventually ending as the fourth perforating artery. ### **Analysis of Incorrect Options** * **A. Medial:** The femoral vein lies medial to the femoral artery at the level of the inguinal ligament. The profunda femoris does not originate medially. * **C. Posterior:** While the artery eventually runs posterior to the femoral vessels, its point of **origin** is specifically on the lateral side. * **D. Posteromedial:** This describes the position of the artery later in its course as it passes deep to the adductor longus, but not its origin. ### **High-Yield Clinical Pearls for NEET-PG** * **Surface Anatomy:** The origin of the profunda femoris is located roughly midway between the midinguinal point and the apex of the femoral triangle. * **Crucial Branches:** It gives off the **Medial and Lateral Circumflex Femoral arteries**. Note that the Medial Circumflex Femoral artery is the chief supply to the head of the femur (clinically vital in femoral neck fractures). * **Surgical Importance:** During femoral artery cannulation or surgeries, the lateral origin of the profunda femoris is a key landmark to avoid accidental injury or misidentification.

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

Gracilis. 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).

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

Anterior Tibial Artery. ***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.

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

Peroneus tertius. 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.

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

Iliotibial tract. **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).

Q: 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?

Gluteus maximus. ### 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.

Q: What type of joint is the inferior tibiofibular joint?

Syndesmosis. **Explanation:** The **inferior tibiofibular joint** is a classic example of a **Syndesmosis**. A syndesmosis is a type of fibrous joint where two adjacent bones are linked by a strong interosseous membrane or ligament, allowing for minimal movement but providing significant structural stability. At the ankle, this joint is formed by the rough surfaces of the distal tibia and fibula, held together by the anterior and posterior tibiofibular ligaments and the interosseous ligament. **Analysis of Options:** * **Gomphosis (A):** This is a specialized fibrous "peg-and-socket" joint, found exclusively where the roots of the **teeth** fit into the alveolar sockets of the mandible and maxilla. * **Condylar (B):** This is a type of synovial joint (e.g., the knee or metacarpophalangeal joints) where an ovoid articular surface fits into an elliptical cavity, allowing movement in two planes. * **Synchondrosis (D):** This is a primary cartilaginous joint where bones are joined by hyaline cartilage (e.g., the **epiphyseal plate** in growing bone or the first rib-sternum junction). These usually ossify with age. **Clinical Pearls for NEET-PG:** * **High-Yield Fact:** The inferior tibiofibular syndesmosis is crucial for the stability of the **ankle mortise**. * **Clinical Correlation:** A "High Ankle Sprain" refers to an injury of this syndesmosis. * **Radiology:** On an X-ray, an increase in the "tibiofibular clear space" (>6mm) indicates a syndesmotic injury, often requiring surgical stabilization with a syndesmotic screw. * **Other Syndesmoses:** The middle radio-ulnar joint is another example of a syndesmosis in the human body.

Q: Which muscle originates from the tibia, fibula, and interosseous membrane?

Tibialis posterior. The **Tibialis posterior** is the deepest muscle in the posterior compartment of the leg. Its extensive origin is a classic high-yield anatomy fact: it arises from the **posterior surface of the tibia** (below the soleal line), the **medial surface of the fibula**, and the intervening **interosseous membrane**. This broad origin allows it to act as the principal inverter of the foot and a key stabilizer of the medial longitudinal arch. **Analysis of Incorrect Options:** * **Popliteus (A):** Originates from the lateral condyle of the femur (intracapsular but extrasynovial) and inserts into the posterior surface of the tibia above the soleal line. It is the "key" that unlocks the knee. * **Flexor digitorum longus (B):** Originates primarily from the **medial part of the posterior surface of the tibia** (below the soleal line). It does not have a significant fibular origin. * **Flexor hallucis longus (C):** Originates from the **lower two-thirds of the posterior surface of the fibula**. Despite being on the "big toe" side, its origin is lateral (fibular), and its tendon crosses medially in the sole. **High-Yield Clinical Pearls for NEET-PG:** * **Insertion:** Tibialis posterior has a widespread insertion, primarily onto the **tuberosity of the navicular bone**, but it also sends slips to all tarsal bones (except the talus) and the bases of the 2nd, 3rd, and 4th metatarsals. * **Clinical Correlation:** Dysfunction of the Tibialis posterior tendon is the most common cause of **acquired flat foot (Pes Planus)** in adults. * **Tom, Dick, and Harry:** This mnemonic describes 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 is NOT a true statement about the popliteus muscle?

It is inserted on the medial meniscus.. The **popliteus muscle** is a unique, thin, triangular muscle located at the floor of the popliteal fossa. It is often referred to as the "Key to the Knee." ### Why Option C is the Correct Answer (The False Statement) The popliteus muscle originates from the lateral condyle of the femur and the **lateral meniscus** (not the medial meniscus). Its insertion is on the posterior surface of the tibia, above the soleal line. Because it pulls the lateral meniscus posteriorly during knee flexion, it protects the meniscus from being crushed between the femur and tibia. ### Explanation of Other Options * **A. It flexes the knee:** While it is a weak flexor, it initiates the flexion process from a fully extended position. * **B. It unlocks the knee:** This is its most vital function. In a weight-bearing position (closed chain), it **rotates the femur laterally** on the fixed tibia to "unlock" the joint so flexion can occur. In a non-weight-bearing position, it rotates the tibia medially. * **D. It is an intracapsular muscle:** The popliteus tendon is unique because it is **intracapsular but extrasynovial**. It arises inside the fibrous capsule of the knee joint but is separated from the joint cavity by a synovial reflection. ### NEET-PG High-Yield Pearls * **Nerve Supply:** Tibial nerve (L4, L5, S1). * **Morphology:** It is considered the "remnant" of the long flexor of the hallux (in lower animals). * **Tendon Relation:** The tendon of the popliteus separates the **lateral collateral ligament (LCL)** from the **lateral meniscus**, which is why the lateral meniscus is more mobile and less prone to injury than the medial meniscus.

Question 1

By which nerve is the hip joint supplied?

Accepted Answer

Femoral

Answer

Deep peroneal

Answer

Sciatic

Answer

Posterior cutaneous nerve of thigh

Question 2

At its origin, the profunda femoris artery lies on which side of the femoral artery?

Accepted Answer

Lateral

Answer

Medial

Answer

Posterior

Answer

Posteromedial

Question 3

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

Accepted Answer

Gracilis

Answer

Iliacus

Answer

Sartorius

Answer

Rectus femoris

Question 4

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

Accepted Answer

Anterior Tibial Artery

Answer

Popliteal Artery

Answer

Posterior Tibial Artery

Answer

Dorsal Arch of Foot

Question 5

Which of the following is a muscle of the anterior compartment of the leg?

Accepted Answer

Peroneus tertius

Answer

Peroneus brevis

Answer

Peroneus longus

Answer

Flexor digitorum longus

Question 6

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

Accepted Answer

Iliotibial tract

Answer

Lesser trochanter

Answer

Greater trochanter

Answer

Spiral line

Question 7

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?

Accepted Answer

Gluteus maximus

Answer

Gluteus medius

Answer

Gluteus minimus

Answer

Tensor fasciae latae

Question 8

What type of joint is the inferior tibiofibular joint?

Accepted Answer

Syndesmosis

Answer

Gomphosis

Answer

Condylar

Answer

Synchondrosis

Question 9

Which muscle originates from the tibia, fibula, and interosseous membrane?

Accepted Answer

Tibialis posterior

Answer

Popliteus

Answer

Flexor digitorum longus

Answer

Flexor hallucis longus

Question 10

Which of the following is NOT a true statement about the popliteus muscle?

Accepted Answer

It is inserted on the medial meniscus.

Answer

It flexes the knee.

Answer

It unlocks the knee.

Answer

It is an intracapsular muscle.

Lower Limb — MCQs

Lower Limb — MCQs

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