Lower Limb Practice Questions

Q: The tendon of which of the following muscles is stretched during the patellar reflex?

Quadriceps femoris. The **patellar reflex** (knee-jerk reflex) is a classic example of a monosynaptic deep tendon reflex [1]. When the patellar ligament is tapped with a reflex hammer, it causes a sudden stretch of the **Quadriceps femoris** muscle. This stretch is detected by muscle spindles, sending an afferent signal via the femoral nerve to the spinal cord (L2–L4), resulting in a compensatory contraction of the quadriceps and extension of the knee [2]. **Analysis of Options:** * **Quadriceps femoris (Correct):** This muscle group (Rectus femoris, Vastus lateralis, medialis, and intermedius) inserts into the patella and, via the patellar ligament, onto the tibial tuberosity. It is the primary extensor of the knee and the effector muscle for this reflex. The muscle spindle and its reflex connections constitute a feedback device that operates to maintain muscle length [2]. * **Quadratus femoris:** Despite the similar name, this is a short lateral rotator of the hip located in the gluteal region. It has no role in knee extension or the patellar reflex. * **Sartorius:** Known as the "tailor's muscle," it acts to flex, abduct, and laterally rotate the hip, and flex the knee. It does not contribute to the quadriceps tendon. * **Pectineus:** This is a flat muscle in the medial compartment of the thigh that primarily adducts and flexes the hip. **Clinical Pearls for NEET-PG:** * **Root Value:** The patellar reflex specifically tests the **L3 and L4** nerve roots (primarily L4). * **Nerve Involved:** The **Femoral nerve** carries both the afferent (sensory) and efferent (motor) limbs of this reflex. * **Westphal’s Sign:** Refers to the absence or decrease of the patellar reflex, often seen in Lower Motor Neuron (LMN) lesions or Tabes dorsalis. * **Hungup Reflex:** A slow-relaxing patellar reflex is a classic sign of **hypothyroidism**.

Q: In preparing to isolate the proximal portion of the Femoral Artery, the vascular surgeon gently separated it from surrounding tissues. Posterior to the Femoral Sheath, what muscle forms the lateral portion of the floor of the Femoral Triangle?

Iliopsoas. ### Explanation The **Femoral Triangle** is a subfascial space in the upper third of the thigh. Understanding its boundaries and floor is high-yield for surgical anatomy and NEET-PG. **1. Why Iliopsoas is Correct:** The floor of the femoral triangle is gutter-shaped and formed by four muscles. From **lateral to medial**, these are: * **Iliopsoas:** Forms the lateral part of the floor. * **Pectineus:** Forms the medial part of the floor. * (In some texts, the Adductor Longus and Psoas Major are also listed as the most medial and lateral components respectively). Since the question asks for the muscle forming the **lateral portion** of the floor posterior to the femoral sheath, **Iliopsoas** is the correct anatomical landmark. [1] **2. Analysis of Incorrect Options:** * **Adductor Longus (A):** Forms the **medial boundary** of the femoral triangle and the most medial part of the floor. * **Sartorius (C):** Forms the **lateral boundary** of the femoral triangle. It does not form the floor. * **Pectineus (D):** Forms the **medial portion** of the floor. It lies medial to the iliopsoas. **3. Clinical Pearls & High-Yield Facts:** * **Mnemonic for Floor (Lateral to Medial):** "**I** **P**eat **A** lot" (**I**liopsoas, **P**ectineus, **A**dductor longus). * **Femoral Sheath Contents:** The sheath contains the femoral artery (lateral), femoral vein (intermediate), and femoral canal (medial). Note: The **Femoral Nerve** is NOT inside the femoral sheath; it lies lateral to it, resting on the iliopsoas muscle. [1] * **Boundaries:** Superior (Inguinal ligament), Lateral (Sartorius), Medial (Adductor longus). * **Apex:** Formed where the Sartorius crosses the Adductor Longus; it leads into the Adductor (Hunter’s) Canal.

Q: The obturator nerve enters the thigh by passing through which anatomical structure?

Obturator canal. **Explanation:** The **obturator nerve** (L2–L4) is a branch of the lumbar plexus that descends through the psoas major muscle and enters the pelvis. It exits the pelvis to enter the medial compartment of the thigh via the **obturator canal**. This canal is a small opening in the superior part of the obturator membrane, which covers the obturator foramen. Upon entering the thigh, the nerve divides into anterior and posterior divisions, providing motor supply to the adductor muscles and sensory innervation to the medial thigh. **Analysis of Incorrect Options:** * **Adductor canal (Hunter’s canal):** This is a fascial tunnel in the middle third of the thigh. It contains the femoral artery, femoral vein, and the saphenous nerve, but not the obturator nerve. * **Superficial inguinal ring:** This is an opening in the external oblique aponeurosis. It serves as the exit for the spermatic cord (in males) or the round ligament (in females) and the ilioinguinal nerve. * **Femoral canal:** This is the most medial compartment of the femoral sheath. It contains lymphatic vessels and Cloquet’s node; it is a common site for femoral hernias but does not transmit the obturator nerve. **High-Yield Clinical Pearls for NEET-PG:** * **Howship-Romberg Sign:** Pain or paresthesia on the medial aspect of the thigh due to compression of the obturator nerve (often by an obturator hernia). * **Referred Pain:** Pathology in the hip joint can cause referred pain to the knee because the obturator nerve supplies both joints. * **Adductor reflex:** The obturator nerve is the efferent and afferent limb for the adductor reflex (L2-L4).

Q: What is the main action of the Gemellus muscle?

Lateral rotation of the thigh. **Explanation:** The **Gemellus muscles** (Superior and Inferior) belong to the group of **short lateral rotators** of the hip. They are located in the gluteal region, situated superior and inferior to the tendon of the Obturator internus. **1. Why Option B is Correct:** The Gemelli muscles originate from the ischial spine (Superior) and ischial tuberosity (Inferior) and insert into the medial surface of the greater trochanter of the femur. Due to their posterior position relative to the hip joint axis, their contraction pulls the greater trochanter posteriorly, resulting in the **lateral (external) rotation** of the extended thigh. They also help stabilize the femoral head in the acetabulum. **2. Why Other Options are Incorrect:** * **Option A (Medial rotation):** This is primarily performed by the Gluteus medius, Gluteus minimus, and Tensor fasciae latae. * **Option C (Flexion):** The primary hip flexors are the Iliopsoas, Pectineus, and Rectus femoris. * **Option D (Extension):** Hip extension is the main action of the Gluteus maximus and the Hamstring muscles. **3. High-Yield NEET-PG Clinical Pearls:** * **Innervation:** The Superior Gemellus is supplied by the **nerve to obturator internus** (L5, S1), while the Inferior Gemellus is supplied by the **nerve to quadratus femoris** (L4, L5, S1). * **The "Triceps Coxae":** The Superior Gemellus, Obturator Internus, and Inferior Gemellus are often referred to as the *Triceps Coxae* because they share a common insertion. * **Surgical Landmark:** These muscles are vital landmarks during the posterior approach to the hip joint; the sciatic nerve lies superficial to them.

Q: The dorsalis pedis artery is the continuation of which artery?

Anterior tibial artery. ### Explanation **Correct Option: A. Anterior Tibial Artery** The **dorsalis pedis artery** is the direct continuation of the **anterior tibial artery**. This transition occurs at the level of the **ankle joint**, specifically midway between the two malleoli. It runs along the dorsum of the foot to the proximal end of the first intermetatarsal space, where it terminates by dividing into the first dorsal metatarsal artery and the deep plantar artery (which completes the plantar arch). **Analysis of Incorrect Options:** * **B. Posterior Tibial Artery:** This artery passes behind the medial malleolus and terminates by dividing into the medial and lateral plantar arteries on the sole of the foot. * **C. Popliteal Artery:** This is the parent vessel located in the popliteal fossa. It terminates at the lower border of the popliteus muscle by dividing into the anterior and posterior tibial arteries. * **D. Lateral Tarsal Artery:** This is a **branch** of the dorsalis pedis artery, not its origin. It helps supply the tarsal bones and joints. **Clinical Pearls for NEET-PG:** * **Palpation:** The dorsalis pedis pulse is clinically palpated on the dorsum of the foot, just lateral to the tendon of the **Extensor Hallucis Longus (EHL)**. * **Surface Marking:** It is represented by a line joining the midpoint between the malleoli to the proximal end of the first intermetatarsal space. * **Vascular Significance:** Absence of this pulse may indicate peripheral arterial disease (PAD) or Buerger’s disease. However, note that the pulse is congenitally absent in approximately 10% of the population. * **Anastomosis:** The deep plantar branch of the dorsalis pedis joins the lateral plantar artery to form the **Deep Plantar Arch**.

Q: What is the root value of the common peroneal nerve?

L4, L5, S1, S2. **Explanation:** The **Common Peroneal Nerve** (also known as the common fibular nerve) is one of the two terminal branches of the sciatic nerve. The sciatic nerve originates from the sacral plexus (L4 to S3). It is composed of two distinct functional components: the tibial part and the common peroneal part, which are bundled together by a common connective tissue sheath. 1. **Why L4, L5, S1, S2 is correct:** The common peroneal nerve is derived specifically from the **dorsal (posterior) divisions** of the anterior rami of spinal nerves **L4, L5, S1, and S2**. In contrast, the tibial nerve is derived from the ventral (anterior) divisions of L4, L5, S1, S2, and S3. Therefore, the common peroneal component lacks the S3 contribution. 2. **Analysis of Incorrect Options:** * **A (S1, S2, S3):** These roots contribute to the tibial nerve and the posterior cutaneous nerve of the thigh, but do not represent the full span of the common peroneal nerve. * **B (L1, L2, L3):** These are primarily associated with the lumbar plexus (e.g., iliohypogastric, genitofemoral, and lateral cutaneous nerve of the thigh). * **D (S3, S4, S5):** These roots contribute to the pudendal nerve and the coccygeal plexus, supplying the pelvic floor and perineum. **High-Yield Clinical Pearls for NEET-PG:** * **Vulnerability:** The common peroneal nerve is the most commonly injured nerve in the lower limb because of its superficial course as it winds around the **neck of the fibula**. * **Clinical Presentation:** Injury here leads to **Foot Drop** (loss of dorsiflexion) and **Equinovarus** deformity, as it supplies the muscles of the anterior and lateral compartments of the leg. * **Sensory Loss:** Anesthesia occurs over the dorsum of the foot and the lateral aspect of the leg.

Q: The deep peroneal nerve provides sensory innervation to which of the following areas?

The first web space. **Explanation:** The **deep peroneal nerve (DPN)**, a terminal branch of the common peroneal nerve, primarily serves the anterior compartment of the leg. While its function is predominantly motor (innervating the dorsiflexors of the foot and extensors of the toes), its **sensory distribution is highly localized and specific.** 1. **Why Option C is Correct:** After passing deep to the extensor retinaculum, the DPN terminates by supplying the skin of the **first interdigital cleft (the first web space)** and the adjacent sides of the great toe and second toe. This is a high-yield anatomical landmark frequently tested in exams. 2. **Analysis of Incorrect Options:** * **Option A (Anterolateral dorsum of the foot):** This area is primarily supplied by the **superficial peroneal nerve**, which provides sensory innervation to the majority of the dorsal surface of the foot (except the first web space and the lateral edge). * **Option B (Lateral aspect of the leg):** This is supplied by the **lateral sural cutaneous nerve** (a branch of the common peroneal nerve). * **Option D (The fifth web space):** The lateral border of the foot and the fifth digit area are supplied by the **sural nerve**. **Clinical Pearls for NEET-PG:** * **Anterior Compartment Syndrome:** Increased pressure in the anterior compartment can compress the DPN, leading to "foot drop" (motor loss) and sensory loss specifically in the **first web space**. * **Ski Boot Neuropathy:** Compression of the DPN under the extensor retinaculum causes pain and paresthesia in the first web space. * **Mnemonic:** Remember **"Deep = Digits"** (specifically the first two) and **"Superficial = Surface"** (most of the dorsal surface).

Q: What is the blood supply of the great toe?

Dorsalis pedis artery. The blood supply to the foot is divided into dorsal and plantar systems. The **Dorsalis pedis artery (DPA)**, a continuation of the anterior tibial artery, is the primary source of blood for the dorsal aspect of the foot and the toes. **Why Dorsalis Pedis Artery is Correct:** Upon reaching the first intermetatarsal space, the DPA gives off the **First Dorsal Metatarsal Artery**. This specific branch further divides to supply the medial and lateral sides of the **great toe (hallux)** and the medial side of the second toe. This makes the DPA the direct arterial source for the great toe's dorsal surface. **Analysis of Incorrect Options:** * **Lateral plantar artery:** This is a branch of the posterior tibial artery. While it forms the deep plantar arch, it primarily supplies the lateral side of the sole and the lateral four toes. * **Metatarsal artery:** While dorsal metatarsal arteries supply the toes, the question asks for the primary parent source. The first metatarsal artery is a direct branch of the DPA, making DPA the most definitive answer. * **Posterior tibial artery:** This artery supplies the sole of the foot via the medial and lateral plantar arteries. While it contributes to the plantar supply of the toes, the DPA is the classic anatomical answer for the primary supply of the hallux. **NEET-PG High-Yield Pearls:** * **Palpation Point:** The DPA pulse is felt on the dorsum of the foot, lateral to the tendon of **Extensor Hallucis Longus (EHL)**. * **Termination:** The DPA terminates by dipping into the first interosseous space to join the lateral plantar artery, completing the **plantar arch**. * **Clinical Significance:** Absence of the DPA pulse is a classic sign of **Peripheral Arterial Disease (PAD)** or Buerger's disease.

Q: The posterior cutaneous nerve of the thigh supplies the skin overlying which of the following areas EXCEPT?

Lateral aspect of the thigh. The **posterior cutaneous nerve of the thigh (S1, S2, S3)** is a purely sensory branch of the sacral plexus. It descends through the greater sciatic foramen, deep to the gluteus maximus, and runs down the back of the thigh just beneath the fascia lata. ### **Why "Lateral aspect of the thigh" is the correct answer:** The skin of the **lateral aspect of the thigh** is supplied by the **Lateral Cutaneous Nerve of the Thigh (L2, L3)**, which is a branch of the lumbar plexus. The posterior cutaneous nerve specifically supplies the midline posterior strip of the limb, making the lateral aspect the exception. ### **Analysis of Incorrect Options:** * **Posterior inferior aspect of the buttock:** The nerve gives off **inferior cluneal nerves** that loop around the lower border of the gluteus maximus to supply this region. * **Scrotum:** The nerve gives off **perineal branches** that supply the skin of the posterior part of the scrotum (or labia majora in females) and the root of the penis. * **Popliteal fossa:** The nerve continues its descent to supply the skin over the entire back of the thigh and the popliteal fossa, often extending to the upper part of the calf. ### **High-Yield NEET-PG Pearls:** * **Root Value:** S1, S2, S3 (Remember: "1, 2, 3 – back of the knee"). * **Longest Cutaneous Nerve:** It has one of the longest cutaneous distributions in the body. * **Meralgia Paraesthetica:** This clinical condition involves compression of the *Lateral* Cutaneous Nerve of the Thigh (not the posterior) under the inguinal ligament, causing numbness/pain on the lateral thigh. * **Relationship to Gluteus Maximus:** It enters the gluteal region through the infrapiriform compartment, medial to the sciatic nerve.

Question 1

The tendon of which of the following muscles is stretched during the patellar reflex?

Accepted Answer

Quadriceps femoris

Answer

Quadratus femoris

Answer

Sartorius

Answer

Pectineus

Question 2

In preparing to isolate the proximal portion of the Femoral Artery, the vascular surgeon gently separated it from surrounding tissues. Posterior to the Femoral Sheath, what muscle forms the lateral portion of the floor of the Femoral Triangle?

Accepted Answer

Iliopsoas

Answer

Adductor Longus

Answer

Sartorius

Answer

Pectineus

Question 3

The obturator nerve enters the thigh by passing through which anatomical structure?

Accepted Answer

Obturator canal

Answer

Adductor canal

Answer

Superficial inguinal ring

Answer

Femoral canal

Question 4

What is the main action of the Gemellus muscle?

Accepted Answer

Lateral rotation of the thigh

Answer

Medial rotation of the thigh

Answer

Flexion of the hip

Answer

Extension of the hip

Question 5

The dorsalis pedis artery is the continuation of which artery?

Accepted Answer

Anterior tibial artery

Answer

Posterior tibial artery

Answer

Popliteal artery

Answer

Lateral tarsal artery

Question 6

What is the root value of the common peroneal nerve?

Accepted Answer

L4, L5, S1, S2

Answer

S1, S2, S3

Answer

L1, L2, L3

Answer

S3, S4, S5

Question 7

The deep peroneal nerve provides sensory innervation to which of the following areas?

Accepted Answer

The first web space

Answer

Anterolateral dorsum of the foot

Answer

Lateral aspect of the leg

Answer

The fifth web space

Question 8

What is the blood supply of the great toe?

Accepted Answer

Dorsalis pedis artery

Answer

Lateral plantar artery

Answer

Metatarsal artery

Answer

Posterior tibial artery

Question 9

Which of the following statements about the menisci is not true?

Accepted Answer

The menisci are made up of Collagen Type I.

Answer

The lateral meniscus is more mobile than the medial meniscus.

Answer

The lateral meniscus covers more area of the tibial articular surface than the medial meniscus.

Answer

The menisci are composed of around 75% water.

Question 10

The posterior cutaneous nerve of the thigh supplies the skin overlying which of the following areas EXCEPT?

Accepted Answer

Lateral aspect of the thigh

Answer

Posterior inferior aspect of the buttock

Answer

Scrotum

Answer

Popliteal fossa

Lower Limb — MCQs

Lower Limb — MCQs

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