Lower Limb Practice Questions

Q: Inversion and eversion of the foot occur at which joint(s)?

Subtalar and midtarsal joints. **Explanation:** The movements of inversion and eversion are complex, multi-planar movements that occur primarily at the **Subtalar joint** and the **Transverse Tarsal (Midtarsal) joints**. 1. **Subtalar Joint:** Formed between the inferior surface of the talus and the superior surface of the calcaneus. It is the primary site for these movements. 2. **Midtarsal (Transverse Tarsal) Joint:** Comprises the **talocalcaneonavicular** and **calcaneocuboid** joints. These joints act in synergy with the subtalar joint to increase the range of motion, allowing the forefoot to remain flat on the ground while the hindfoot tilts. **Analysis of Options:** * **Option A (Correct):** Inversion and eversion are not restricted to a single joint; they are a combined effort of the subtalar and midtarsal complexes. * **Option B & D:** These are individual components of the midtarsal joint. While they contribute to the movement, selecting them individually is incomplete. * **Option C:** While the midtarsal joint is involved, it cannot perform the full range of inversion/eversion without the subtalar joint. **NEET-PG High-Yield Pearls:** * **Axis of Movement:** Inversion/Eversion occurs around an **oblique axis**. * **Primary Muscles:** * **Inversion:** Tibialis Anterior and Tibialis Posterior ("The Tibials"). * **Eversion:** Peroneus Longus, Brevis, and Tertius ("The Peroneals"). * **Ankle Joint (Talocrural):** Remember that the ankle joint itself only allows **Dorsiflexion and Plantarflexion** (hinge joint). It does *not* contribute to inversion or eversion. * **Clinical Correlation:** Most ankle sprains occur in **inversion**, damaging the **Anterior Talofibular Ligament (ATFL)**.

Q: The nutrient artery to the femur is a branch of which of the following?

2nd perforating branch of the profunda femoris artery. ### Explanation The nutrient artery is essential for the blood supply to the bone marrow and the inner two-thirds of the cortex. In the femur, the nutrient artery typically enters the bone through the **nutrient foramen** located on the **linea aspera**. **1. Why Option C is Correct:** The femur usually receives its primary nutrient supply from the **2nd perforating artery**, which is a branch of the **profunda femoris artery** (deep artery of the thigh). In some anatomical variations, a second nutrient artery may also arise from the 3rd perforating artery, but the 2nd is the most consistent and standard source taught in human anatomy. **2. Analysis of Incorrect Options:** * **Option A (Inferior gluteal artery):** This artery supplies the gluteus maximus and contributes to the cruciate anastomosis; it does not provide a nutrient branch to the femoral shaft. * **Option B (1st perforating artery):** This branch primarily supplies the adductor muscles and the hamstrings and contributes to the cruciate anastomosis. * **Option D (Lateral circumflex femoral artery):** This artery is crucial for the blood supply to the **head and neck of the femur** (via retinacular branches) but does not supply the shaft's nutrient canal. **3. NEET-PG High-Yield Pearls:** * **Direction of Nutrient Foramen:** In the femur, the nutrient canal is directed **upwards** (away from the knee). Remember the mnemonic: *"To the elbow I go, from the knee I flee."* * **Clinical Significance:** During surgical procedures like intramedullary nailing or open reduction internal fixation (ORIF), preserving the soft tissue near the linea aspera is vital to avoid damaging the nutrient artery, which could lead to delayed union or non-union. * **Profunda Femoris:** It is the chief artery of the thigh, giving off medial/lateral circumflex arteries and four perforating branches.

Q: Which of the following is a compound condylar joint?

Knee. ### Explanation **1. Why the Knee Joint is the Correct Answer:** The knee joint is classified as a **compound condylar synovial joint** (specifically a modified hinge joint). * **Compound:** It involves more than two articulating surfaces: the medial and lateral condyles of the femur, the condyles of the tibia, and the patella. * **Condylar:** The primary movement occurs between the rounded femoral condyles and the relatively flat tibial condyles. It is "modified" because, unlike a simple hinge, it allows for **accessory rotation** (locking and unlocking) during extension and flexion. **2. Analysis of Incorrect Options:** * **B. Temporomandibular Joint (TMJ):** This is a **Bicondylar** joint. While it involves condyles, it is characterized by two separate joints (left and right) that must function simultaneously. It is also unique due to its fibrocartilaginous articular disc. * **C. Wrist Joint (Radiocarpal):** This is an **Ellipsoid** joint. It allows movement in two planes (flexion/extension and abduction/adduction) but does not permit independent rotation. * **D. Elbow Joint:** This is a classic **Hinge (Ginglymus)** joint. It allows movement in only one plane (flexion/extension) between the humerus, ulna, and radius. **3. High-Yield Clinical Pearls for NEET-PG:** * **Locking/Unlocking:** The "Screw-home" mechanism is a key feature of the knee. **Popliteus** is the muscle responsible for **unlocking** the knee by laterally rotating the femur on the fixed tibia. * **Complex vs. Compound:** A *complex* joint contains an intra-articular disc or meniscus (e.g., TMJ, Sternoclavicular). The knee is both **compound** (multiple bones) and **complex** (contains menisci). * **Most Common Site of Injury:** The **Medial Meniscus** is more commonly injured than the lateral because it is fixed to the Medial Collateral Ligament (MCL).

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

All of the above.. The **Posterior Cutaneous Nerve of the Thigh (S1, S2, S3)** is a purely sensory branch of the sacral plexus. It has an extensive distribution that goes beyond just the posterior thigh, which is a common point of confusion in exams. ### **Explanation of the Correct Answer** The nerve enters the gluteal region through the greater sciatic foramen (below the piriformis) and descends deep to the gluteus maximus. Its branches include: * **Gluteal branches (Inferior Clunial Nerves):** These wind around the lower border of the gluteus maximus to supply the skin of the **posteroinferior aspect of the buttock** (Option B). * **Perineal branch:** This branch passes medially across the ischial tuberosity to supply the skin of the **perineum, scrotum (in males), or labia majora (in females)** (Option C). * **Femoral branches:** These supply the skin of the back of the thigh and the **medial aspect of the thigh** (Option A), extending down to the popliteal fossa. Since the nerve contributes to the cutaneous innervation of all three mentioned areas, **Option D (All of the above)** is correct. ### **Clinical Pearls for NEET-PG** * **Root Value:** S1, S2, S3 (High-yield). * **Course:** It runs superficial to the sciatic nerve. While the sciatic nerve is motor and sensory, the posterior cutaneous nerve of the thigh is **purely sensory**. * **Differential Diagnosis:** Pain or paresthesia in the scrotum/perineum is often mistaken for pudendal nerve issues; however, the perineal branch of the posterior cutaneous nerve also contributes to this area. * **Comparison:** Do not confuse it with the *Lateral* Cutaneous Nerve of the Thigh (L2, L3), which is involved in **Meralgia Paresthetica**.

Q: Which dermatome is marked?

S2. ***S2*** - The **S2 dermatome** covers the **posterior thigh**, **popliteal fossa**, **posterior and lateral leg**, and **lateral border of the foot** including the heel. - This distribution is crucial for **neurological examination** and **nerve root compression** assessment in conditions like **sciatica**. *L4* - The **L4 dermatome** primarily covers the **medial leg** and **medial malleolus** area, not the posterior thigh region. - It extends over the **anterior and medial thigh** and **medial aspect of the lower leg** down to the **great toe**. *L5* - The **L5 dermatome** covers the **lateral leg**, **dorsum of foot**, and **first three toes**, distinct from the posterior distribution. - It includes the **anterior and lateral leg** and **medial three toes**, not the posterior thigh or heel area. *S1* - The **S1 dermatome** covers the **posterior and lateral leg**, **lateral foot**, and **fourth and fifth toes**, but spares the posterior thigh. - It primarily innervates the **plantar surface** and **lateral border of foot** without extending to the **popliteal fossa** area.

Q: Which of the following muscles is NOT supplied by the deep peroneal nerve?

Peroneus brevis. **Explanation:** The common peroneal nerve divides into the **superficial** and **deep peroneal nerves** at the neck of the fibula. To answer this question, one must distinguish between the contents of the anterior and lateral compartments of the leg. **1. Why Peroneus Brevis is the correct answer:** The **Peroneus brevis** (along with the Peroneus longus) is located in the **lateral compartment** of the leg. This compartment is exclusively supplied by the **superficial peroneal nerve**. Therefore, it is not supplied by the deep peroneal nerve. **2. Why the other options are incorrect:** The **Deep Peroneal Nerve** (Anterior Tibial Nerve) supplies all the muscles of the **anterior compartment** of the leg and the dorsum of the foot. * **Tibialis anterior:** The most medial muscle of the anterior compartment; supplied by the deep peroneal nerve. * **Extensor hallucis longus:** Responsible for extending the big toe; supplied by the deep peroneal nerve. * **Extensor digitorum longus:** Responsible for extending the lateral four toes; supplied by the deep peroneal nerve. **Clinical Pearls for NEET-PG:** * **Foot Drop:** Injury to the Common Peroneal Nerve (e.g., fibular neck fracture) leads to paralysis of both anterior and lateral compartments, resulting in "Foot Drop" and loss of eversion. * **Sensory Supply:** The deep peroneal nerve supplies only the **first web space** of the foot. The rest of the dorsum is supplied by the superficial peroneal nerve. * **Mnemonic:** The Deep Peroneal Nerve is the nerve of **Extension** and **Dorsiflexion**.

Q: Which of the following is NOT a muscle of the first layer of the foot?

Flexor digitorum accessorius. The sole of the foot is organized into four distinct muscular layers. Understanding this stratification is a high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** **Option D (Flexor digitorum accessorius)** is the correct answer because it belongs to the **second layer** of the sole, not the first. Also known as the *Quadratus plantae*, this muscle originates from the calcaneus and inserts into the tendons of the Flexor Digitorum Longus (FDL). Its primary function is to straighten the oblique pull of the FDL tendons. ### **Analysis of Incorrect Options (First Layer Muscles)** The first layer is the most superficial layer, located immediately deep to the plantar aponeurosis. It consists of three muscles: * **Abductor hallucis (Option B):** Located medially; abducts the great toe. * **Flexor digitorum brevis (Option A):** Located centrally; flexes the middle phalanges of the lateral four toes. * **Abductor digiti minimi (Option C):** Located laterally; abducts the little toe. ### **High-Yield NEET-PG Pearls** * **The "Rule of 3s":** The first layer has **3 muscles**, and the second layer has **2 muscles** (Flexor digitorum accessorius and Lumbricals) plus **2 tendons** (FDL and Flexor Hallucis Longus). * **Nerve Supply:** Most intrinsic muscles of the foot are supplied by the **Lateral Plantar Nerve** (S2, S3). The exceptions (supplied by the **Medial Plantar Nerve**) are the "LAFF" muscles: **L**umbrical (1st), **A**bductor hallucis, **F**lexor digitorum brevis, and **F**lexor hallucis brevis. * **Clinical Correlation:** The Flexor digitorum accessorius is unique because it is the only muscle in the body that inserts into a tendon rather than a bone.

Question 1

A 55-year-old man is admitted to the hospital for an iliofemoral bypass. The operation is performed successfully and the blood flow between the iliac and femoral arteries is restored. During rehabilitation, which of the following arteries should be palpated to monitor good circulation of the lower limb?

Accepted Answer

Dorsalis pedis artery

Answer

Anterior tibial artery

Answer

Deep fibular (peroneal) artery

Answer

Deep plantar artery

Question 2

Inversion and eversion of the foot occur at which joint(s)?

Accepted Answer

Subtalar and midtarsal joints

Answer

Calcaneonavicular joint

Answer

Midtarsal joint

Answer

Calcaneocuboid joint

Question 3

Which compartment of the leg is devoid of a neurovascular bundle?

Accepted Answer

Posterior superficial compartment of leg

Answer

Anterior compartment of leg

Answer

Posterior deep compartment of leg

Answer

Lateral compartment of leg

Question 4

The nutrient artery to the femur is a branch of which of the following?

Accepted Answer

2nd perforating branch of the profunda femoris artery

Answer

Inferior gluteal artery

Answer

1st perforating branch of the profunda femoris artery

Answer

Lateral circumflex femoral artery

Question 5

Which of the following is a compound condylar joint?

Accepted Answer

Knee

Answer

Temporomandibular joint

Answer

Wrist

Answer

Elbow

Question 6

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

Accepted Answer

All of the above.

Answer

The medial aspect of the thigh.

Answer

The posteroinferior aspect of the buttock.

Answer

The scrotum.

Question 7

During physical examination of a patient with a history of TIA, the ankle jerk reflex is found to be absent. Which of the following nerves is responsible for this reflex arc?

Accepted Answer

Tibial

Answer

Common fibular (peroneal)

Answer

Superficial fibular (peroneal)

Answer

Deep fibular (peroneal)

Question 8

Which dermatome is marked?

Accepted Answer

S2

Answer

L4

Answer

L5

Answer

S1

Question 9

Which of the following muscles is NOT supplied by the deep peroneal nerve?

Accepted Answer

Peroneus brevis

Answer

Tibialis anterior

Answer

Extensor hallucis longus

Answer

Extensor digitorum longus

Question 10

Which of the following is NOT a muscle of the first layer of the foot?

Accepted Answer

Flexor digitorum accessorius

Answer

Flexor digitorum brevis

Answer

Abductor hallucis

Answer

Abductor digiti minimi

Lower Limb — MCQs

Lower Limb — MCQs

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