Lower Limb Practice Questions

Q: What is the major extensor of the thigh?

Gluteus maximus. **Explanation:** The **Gluteus maximus** is the largest and most superficial muscle of the gluteal region. Its primary action is the **powerful extension of the thigh** at the hip joint. It is particularly active during movements requiring force, such as rising from a sitting position, climbing stairs, or running. It is supplied by the **Inferior Gluteal Nerve (L5, S1, S2)**. **Analysis of Options:** * **Gluteus maximus (Correct):** It is the chief extensor of the hip. It also assists in lateral rotation and provides steadying of the femur on the tibia via the iliotibial tract. * **Psoas major & Iliacus (Incorrect):** These two muscles often act together as the **Iliopsoas**, which is the **strongest flexor** of the thigh at the hip joint—the direct functional antagonist to the gluteus maximus. * **Obturator internus (Incorrect):** This is a member of the short rotator group. Its primary function is **lateral rotation** of the extended thigh and abduction of the flexed thigh. **High-Yield Clinical Pearls for NEET-PG:** * **Trendelenburg Test:** Evaluates the Gluteus **medius and minimus** (abductors), not the maximus. Superior gluteal nerve injury leads to a positive Trendelenburg sign. * **Gower’s Sign:** Patients with muscular dystrophy use their hands to

Q: Which of the following ligaments does NOT contribute to the stability of the ankle (talocrural) joint?

Calcaneonavicular (spring). The stability of the **ankle (talocrural) joint**—a hinge-type synovial joint—is primarily maintained by the shape of the talus within the malleolar mortise and two major sets of collateral ligaments. **1. Why Calcaneonavicular (Spring) Ligament is the correct answer:** The spring ligament connects the sustentaculum tali of the calcaneus to the navicular bone. Its primary function is to support the **head of the talus** and maintain the **medial longitudinal arch** of the foot. While it is crucial for the stability of the **talocalcaneonavicular joint**, it does not cross or directly stabilize the talocrural (ankle) joint. **2. Why the other options are incorrect:** * **Deltoid Ligament (Medial):** A very strong, triangular ligament that stabilizes the medial aspect of the ankle. It prevents over-eversion and consists of superficial and deep fibers. * **Lateral Ligament:** Composed of three distinct bands (ATFL, CFL, and PTFL), it stabilizes the lateral aspect of the ankle against over-inversion. * **Posterior Talofibular Ligament (PTFL):** This is the strongest part of the lateral collateral ligament complex. It runs horizontally from the lateral malleolar fossa to the posterior tubercle of the talus, providing significant posterior stability to the ankle joint. **Clinical Pearls for NEET-PG:** * **Most commonly injured ligament:** The **Anterior Talofibular Ligament (ATFL)** is the weakest and the first to tear in inversion (sprain) injuries. * **The "Spring" Ligament:** If this ligament is overstretched or ruptured, it leads to the collapse of the medial longitudinal arch, resulting in **Pes Planus (Flat Foot)**. * **Pott’s Fracture:** Occurs during forced eversion; the strong deltoid ligament often pulls off the medial malleolus (avulsion) rather than tearing itself.

Q: What is true about the synovial membrane of the knee joint?

It is invaginated posteriorly by the cruciate ligament.. ### Explanation **Correct Option: A. It is invaginated posteriorly by the cruciate ligament.** The knee joint is unique because the **cruciate ligaments (ACL and PCL)** are **intracapsular but extrasynovial**. During development, the synovial membrane is invaginated from the posterior aspect of the joint. It reflects forward around the ligaments, covering them anteriorly and on their sides. Consequently, the cruciate ligaments are excluded from the synovial cavity, even though they lie within the fibrous capsule. **Why the other options are incorrect:** * **Option B (Prepatellar bursa):** The prepatellar bursa lies subcutaneously, anterior to the patella. It does **not** communicate with the knee joint cavity. * **Option C (Menisci):** The synovial membrane lines the fibrous capsule but **does not cover the superior or inferior surfaces of the menisci**. The menisci are intra-articular structures bathed in synovial fluid; covering them with a membrane would interfere with their weight-bearing and lubricating functions. * **Option D (Infrapatellar bursa):** There are two infrapatellar bursae: the superficial (subcutaneous) and the deep. Neither communicates with the synovial cavity of the knee. Note that the **suprapatellar bursa** is the one that always communicates with the joint cavity. **High-Yield Facts for NEET-PG:** * **Suprapatellar Bursa:** This is the largest bursa and is an extension of the synovial cavity. It is held in place by the **Articularis Genu** muscle. * **Infrapatellar Fold:** The synovial membrane forms a fold anteriorly called the infrapatellar synovial fold, which contains the **infrapatellar fat pad (Hoffa’s fat pad)**. * **Popliteus Tendon:** This is also **intracapsular but extrasynovial** at its origin, similar to the cruciate ligaments. * **Baker’s Cyst:** A herniation of the synovial membrane, usually into the semimembranosus bursa posteriorly.

Q: The common peroneal nerve is related to which of the following structures?

Neck of fibula. ### Explanation **Correct Answer: B. Neck of fibula** The **Common Peroneal Nerve (CPN)**, also known as the common fibular nerve, is a terminal branch of the sciatic nerve. It descends through the popliteal fossa and winds laterally around the **neck of the fibula**. At this specific anatomical landmark, the nerve lies subcutaneously, resting directly against the bone before dividing into its superficial and deep peroneal branches within the fibularis longus muscle. **Analysis of Incorrect Options:** * **A & D (Shaft of Tibia/Fibula):** The CPN does not travel along the mid-shaft of either bone. The tibial nerve is related to the posterior aspect of the tibia, while the peroneal nerve branches are deep to the muscles along the fibular shaft. * **C (Lower tibio-fibular joint):** This joint is located at the ankle. By this level, the CPN has already bifurcated into the deep peroneal nerve (which enters the foot) and the superficial peroneal nerve. **Clinical Pearls & High-Yield Facts for NEET-PG:** * **Most Common Site of Injury:** The neck of the fibula is the most common site for CPN compression or injury due to its superficial location. * **Clinical Presentation:** Injury at this site leads to **Foot Drop** (loss of dorsiflexion) and **Equinovarus** deformity, along with sensory loss on the dorsum of the foot. * **Causes of Injury:** Tight plaster casts, leg crossing, or fractures of the fibular neck. * **Mnemonic:** **PED** (Peroneal Everts and Dorsiflexes; if injured, you get **Drop** foot).

Q: Which muscle originates from the anterior superior iliac spine of the hip bone?

Sartorius. The **Sartorius** muscle is the correct answer as it originates from the **Anterior Superior Iliac Spine (ASIS)** of the hip bone. It is the longest muscle in the human body and belongs to the anterior compartment of the thigh. It follows an oblique course across the thigh to insert into the upper part of the medial surface of the tibia (forming part of the *Pes Anserinus*). **Analysis of Options:** * **Iliacus:** Originates from the **Iliac fossa** (upper two-thirds) and the inner lip of the iliac crest. It joins the psoas major to insert into the lesser trochanter of the femur. * **Vastus Medialis:** This is part of the Quadriceps femoris. It originates from the **intertrochanteric line** and the medial lip of the **linea aspera** on the femur, not the hip bone. * **Pectineus:** Originates from the **pectineal line (pecten pubis)** on the superior ramus of the pubis. **High-Yield Clinical Pearls for NEET-PG:** 1. **ASIS Landmarks:** Two structures attach to the ASIS: the **Sartorius** muscle and the lateral end of the **Inguinal Ligament**. 2. **Tailor’s Muscle:** Sartorius is known as the "Tailor's muscle" because its actions (flexion, abduction, and lateral rotation of the hip; flexion of the knee) produce the cross-legged sitting posture. 3. **Pes Anserinus:** Remember the mnemonic **"SGT"** for the three muscles inserting at the medial tibia: **S**artorius, **G**racilis, and semi**T**endinosus. 4. **Nerve Supply:** Sartorius is supplied by the **Femoral Nerve (L2, L3)**.

Q: A 7-year-old girl sustains an injury to a nerve that passes superior to the piriformis muscle and winds around the greater sciatic notch. Which of the following muscles is most likely affected?

Gluteus medius. ### Explanation The correct answer is **Gluteus medius**. **1. Why Gluteus medius is correct:** The nerve described is the **superior gluteal nerve (L4–S1)**. Anatomically, this nerve exits the pelvis through the **greater sciatic foramen**, specifically passing **superior to the piriformis muscle**. After exiting, it runs between the gluteus medius and gluteus minimus muscles. It supplies three specific muscles: the **gluteus medius**, **gluteus minimus**, and **tensor fasciae latae (TFL)**. Therefore, an injury to this nerve directly affects the gluteus medius. **2. Why the other options are incorrect:** * **Gluteus maximus:** This muscle is supplied by the **inferior gluteal nerve**, which exits the greater sciatic notch **inferior** to the piriformis muscle. * **Obturator internus:** This muscle is supplied by the nerve to obturator internus (L5–S2), which also passes **inferior** to the piriformis. * **Piriformis:** This muscle is supplied by direct branches from the sacral plexus (**S1, S2 nerve roots**) before they exit the foramen. The superior gluteal nerve passes over it but does not supply it. **3. NEET-PG Clinical Pearls:** * **Trendelenburg Sign:** Injury to the superior gluteal nerve leads to paralysis of the gluteus medius and minimus. This results in the "dropping" of the pelvis on the unaffected side when the patient stands on the affected leg. * **Safe Injection Site:** To avoid injuring the sciatic nerve (inferior to piriformis) and the superior gluteal nerve, intramuscular injections in the gluteal region are administered in the **upper outer quadrant**. * **Structures passing ABOVE Piriformis:** Only two structures—the Superior Gluteal Nerve and Superior Gluteal Vessels. All other major nerves (Sciatic, Pudendal, Inferior Gluteal) pass **below** it.

Q: Which of the following is attached to the head of the fibula?

Fibular collateral ligament. The **head of the fibula** serves as a vital anchoring point for structures on the posterolateral aspect of the knee. ### **Why Option C is Correct** The **Fibular Collateral Ligament (FCL)**, also known as the Lateral Collateral Ligament (LCL), is a cord-like structure that extends from the lateral epicondyle of the femur to the **lateral surface of the head of the fibula**. It is primarily responsible for resisting varus stress. At its insertion, it is split by the tendon of the **biceps femoris**, which also attaches to the fibular head. ### **Why Other Options are Incorrect** * **A. Lateral Meniscus:** Unlike the medial meniscus (which is attached to the tibial collateral ligament), the lateral meniscus is **not** attached to the fibular collateral ligament or the fibula. This makes it more mobile and less prone to injury. * **B. Popliteus Tendon:** The popliteus muscle originates from the lateral condyle of the femur and inserts into the posterior surface of the tibia (above the soleal line). It passes deep to the FCL but does not attach to the fibula. * **D. Posterior Cruciate Ligament (PCL):** The PCL attaches to the posterior intercondylar area of the **tibia** and the medial condyle of the femur. It has no anatomical relationship with the fibula. ### **High-Yield Clinical Pearls for NEET-PG** * **Common Peroneal Nerve:** This nerve winds around the **neck of the fibula**. Fractures at this site can lead to **foot drop** due to paralysis of the anterior and lateral compartment muscles of the leg. * **Biceps Femoris:** This is the only hamstring muscle that attaches to the fibula (head), making it a key landmark during lateral surgical approaches to the knee. * **Stability:** The fibula does not participate in the knee joint proper (it does not articulate with the femur), but it is essential for the stability of the **proximal tibiofibular joint**.

Q: What is the most important perforator of the lower limb?

Long saphenous vein and femoral vein. ### Explanation The correct answer is **D: Long saphenous vein and femoral vein**. **1. Underlying Medical Concept** Perforating veins are vessels that connect the superficial venous system to the deep venous system by "perforating" the deep fascia [1]. The most clinically significant and anatomically "important" perforator is the **Saphenofemoral Junction (SFJ)**. This is the point where the Long Saphenous Vein (Great Saphenous Vein) drains into the Femoral Vein at the fossa ovalis [1]. It is considered the most important because it is the primary site of valvular incompetence leading to primary varicose veins and is the target of surgical interventions like Trendelenburg ligation. **2. Analysis of Incorrect Options** * **Options A & B:** While the **Posterior Tibial Vein** connects to the superficial system via the **Cockett perforators** (lower leg), these are multiple smaller vessels rather than a single primary junction. * **Options B & C:** The **Short Saphenous Vein** drains into the **Popliteal Vein** at the Saphenopopliteal Junction (SPJ). While important, it is anatomically secondary to the SFJ in terms of the volume of blood carried and the frequency of clinical pathology [1]. **3. NEET-PG High-Yield Clinical Pearls** * **Direction of Flow:** In health, blood flows from superficial to deep veins. Incompetent valves in perforators cause "reflux," leading to varicosities and skin changes (lipodermatosclerosis) [2]. * **Named Perforators to Remember:** * **Hunterian (Mid-thigh):** Connects GSV to Femoral vein. * **Dodd’s (Lower thigh):** Connects GSV to Femoral vein. * **Boyd’s (Below knee):** Connects GSV to Gastocnemius/PTV. * **Cockett’s (Ankle):** Connects the posterior arch vein to PTV; these are the most common sites for venous ulcers [3]. * **Trendelenburg Test:** Used clinically to differentiate between SFJ incompetence and perforator incompetence.

Q: Which of the following statements is true about the ankle joint?

All of the above.. The ankle joint (talocrural joint) is a classic high-yield topic in NEET-PG Anatomy. Here is the breakdown of why all the provided statements are correct: **1. Strengthening by the Deltoid Ligament (Option A):** The medial aspect of the ankle is reinforced by the powerful, fan-shaped **deltoid ligament**. It is significantly stronger than the lateral ligaments, which is why eversion sprains are rare compared to inversion sprains. It connects the medial malleolus to the talus, calcaneus, and navicular bones. **2. Stability in Dorsiflexion (Option B):** The superior surface of the talus (trochlea) is **wider anteriorly** than posteriorly. During dorsiflexion, the wider anterior part of the talus wedges tightly between the medial and lateral malleoli, locking the joint and making it most stable. Conversely, in plantarflexion, the narrower posterior part of the talus resides in the mortise, making the joint relatively unstable and prone to injury. **3. Classification as a Hinge Joint (Option C):** The ankle is a **synovial hinge joint** (ginglymus). It primarily allows movement in one plane: dorsiflexion and plantarflexion. Inversion and eversion occur at the subtalar and midtarsal joints, not the ankle joint itself. **Clinical Pearls for NEET-PG:** * **Most common ligament injured:** The **Anterior Talofibular Ligament (ATFL)** during an inversion stress (sprain). * **Pott’s Fracture:** A bimalleolar fracture occurring due to forced eversion, often involving a tear of the deltoid ligament or avulsion of the medial malleolus. * **Nerve Supply:** Deep peroneal and tibial nerves (Hilton’s Law).

Q: All of the following muscles attach to the lesser trochanter of the femur, EXCEPT?

Psoas minor. The **lesser trochanter** is a small, conical projection located on the posteromedial aspect of the proximal femur. It serves as the primary insertion site for the powerful hip flexors. ### **Why Psoas Minor is the Correct Answer** The **Psoas minor** is a weak flexor of the trunk that is absent in approximately 40-50% of the population. Unlike the psoas major, it does not reach the femur. Instead, it inserts into the **pectineal line of the pubis** and the **iliopubic eminence**. Therefore, it has no attachment to the lesser trochanter. ### **Analysis of Incorrect Options** * **Psoas Major (A) & Iliacus (D):** These two muscles merge to form the **Iliopsoas tendon**, which is the principal muscle of hip flexion. The Iliopsoas inserts directly onto the **apex and anterior surface of the lesser trochanter**. * **Adductor Magnus (C):** While the bulk of the adductor magnus inserts into the linea aspera and adductor tubercle, its **superior-most fibers** (sometimes called the *adductor minimus*) insert into the area extending from the **quadrate tubercle down to the posterior surface of the lesser trochanter**. ### **NEET-PG High-Yield Pearls** * **Iliopsoas:** The strongest flexor of the hip. In cases of **Iliopsoas Abscess** (often secondary to TB of the spine), the pus tracks down the psoas sheath and may point just below the inguinal ligament. * **Lesser Trochanter Fractures:** In adults, an isolated avulsion fracture of the lesser trochanter is rare and is considered a **pathognomonic sign of metastatic malignant infiltration** until proven otherwise. * **Nerve Supply:** Iliacus (Femoral nerve L2-L3); Psoas major (Ventral rami of L1-L3).

Question 1

What is the major extensor of the thigh?

Accepted Answer

Gluteus maximus

Answer

Psoas major

Answer

Obturator internus

Answer

Iliacus

Question 2

Which of the following ligaments does NOT contribute to the stability of the ankle (talocrural) joint?

Accepted Answer

Calcaneonavicular (spring)

Answer

Deltoid

Answer

Lateral

Answer

Posterior talofibular

Question 3

What is true about the synovial membrane of the knee joint?

Accepted Answer

It is invaginated posteriorly by the cruciate ligament.

Answer

It extends into the prepatellar bursa.

Answer

It covers the inferior surface of both menisci.

Answer

It extends into the infrapatellar bursa.

Question 4

The common peroneal nerve is related to which of the following structures?

Accepted Answer

Neck of fibula

Answer

Shaft of tibia

Answer

Lower tibio-fibular joint

Answer

Shaft of fibula

Question 5

Which muscle originates from the anterior superior iliac spine of the hip bone?

Accepted Answer

Sartorius

Answer

Iliacus

Answer

Vastus Medialis

Answer

Pectineus

Question 6

A 7-year-old girl sustains an injury to a nerve that passes superior to the piriformis muscle and winds around the greater sciatic notch. Which of the following muscles is most likely affected?

Accepted Answer

Gluteus medius

Answer

Gluteus maximus

Answer

Obturator internus

Answer

Piriformis

Question 7

Which of the following is attached to the head of the fibula?

Accepted Answer

Fibular collateral ligament

Answer

Lateral meniscus

Answer

Popliteus tendon

Answer

Posterior cruciate ligament

Question 8

What is the most important perforator of the lower limb?

Accepted Answer

Long saphenous vein and femoral vein

Answer

Long saphenous vein and posterior tibial vein

Answer

Short saphenous vein and posterior tibial vein

Answer

Short saphenous vein and popliteal vein

Question 9

Which of the following statements is true about the ankle joint?

Accepted Answer

All of the above.

Answer

The joint is strengthened by the deltoid ligament.

Answer

It is more stable in a dorsi-flexed position.

Answer

It is a hinge joint.

Question 10

All of the following muscles attach to the lesser trochanter of the femur, EXCEPT?

Accepted Answer

Psoas minor

Answer

Psoas major

Answer

Adductor magnus

Answer

Iliacus

Lower Limb — MCQs

Lower Limb — MCQs

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