Lower Limb Practice Questions

Q: Eversion occurs at which joint?

Subtalar. ***Subtalar*** - **Eversion** of the foot is a complex movement involving the outward turning of the sole. - This motion primarily occurs at the **subtalar joint**, which is formed by the talus and calcaneus bones. *Ankle* - The **ankle joint** (talocrural joint) is primarily responsible for **dorsiflexion** and **plantarflexion** of the foot. - While it contributes to overall foot movement, it is not the main joint for eversion. *Metatarsophalangeal* - **Metatarsophalangeal joints** are located between the metatarsals and the proximal phalanges of the toes. - These joints are primarily involved in the **flexion and extension** of the toes, not eversion of the foot. *Interphalangeal* - **Interphalangeal joints** are the joints within the toes, responsible for **flexion and extension** of the phalanges. - They play no direct role in the eversion of the entire foot.

Q: Which lymph nodes drain the skin and fascia of the great toe?

Superficial inguinal lymph nodes. ***Superficial inguinal lymph nodes*** - The **superficial inguinal lymph nodes** are responsible for draining lymph from the skin and fascia of the lower limb, including the **great toe**. [1] - They are located in the superficial fascia below the inguinal ligament and receive lymphatic vessels associated with the **great saphenous vein**. *External iliac lymph nodes* - The external iliac lymph nodes drain structures within the **pelvis** and receive lymph from the **deep inguinal lymph nodes**, not directly from the skin of the great toe. - They are located along the external iliac artery and vein. *Internal iliac lymph nodes* - The internal iliac lymph nodes primarily drain lymph from the **pelvic organs** and the **perineum**. - They do not directly receive lymphatic drainage from the great toe or the superficial lower limb. *Deep inguinal lymph nodes* - The deep inguinal lymph nodes are located deeper, medial to the **femoral vein**, and receive lymph mainly from the deep structures of the lower limb. - While they eventually drain into the external iliac nodes, they do not directly drain the superficial skin and fascia of the great toe.

Q: Which of the following muscles is NOT a boundary of the popliteal fossa?

Adductor magnus. ***Adductor magnus*** - The **adductor magnus** is located in the **medial compartment of the thigh** and forms part of the floor of the adductor canal, not a boundary of the popliteal fossa. - Its primary action is **adduction of the thigh**, along with extension and external rotation, and it doesn't contribute to the distinct diamond shape of the popliteal region. - The popliteal fossa boundaries include biceps femoris (superolateral), semimembranosus and semitendinosus (superomedial), and the two heads of gastrocnemius (inferolateral and inferomedial). *Biceps femoris* - The **biceps femoris** forms the **superolateral boundary** of the popliteal fossa. - As one of the hamstring muscles, its tendon is easily palpable and defines the upper outer aspect of this region. *Lateral head of Gastrocnemius* - The **lateral head of the gastrocnemius** forms the **inferolateral boundary** of the popliteal fossa. - This muscle contributes to the lower outer aspect of the popliteal diamond, originating from the lateral femoral condyle. *Medial head of Gastrocnemius* - The **medial head of the gastrocnemius** forms the **inferomedial boundary** of the popliteal fossa. - Originating from the medial femoral condyle, it defines the lower inner aspect of the popliteal region.

Q: Which of the following hamstring muscles performs both hip extension and knee flexion?

Semimembranosus. ***Semimembranosus*** - The **semimembranosus** is one of the three **hamstring muscles** originating from the **ischial tuberosity** and crossing both the hip and knee joints. - Its origin proximal to the hip joint and insertion distal to the knee joint allow it to perform **hip extension** and **knee flexion**. - Along with **semitendinosus** and the **long head of biceps femoris**, it forms the true hamstring group. *Gracilis* - The **gracilis is NOT a hamstring muscle** - it belongs to the **medial thigh adductor group**. - It is primarily responsible for **hip adduction** and assists in **knee flexion** and internal rotation. - It does not perform hip extension. *Sartorius* - The **sartorius is NOT a hamstring muscle** - it is an **anterior thigh muscle**. - It is the longest muscle in the body, primarily involved in **flexing**, **abducting**, and **laterally rotating the hip**, and **flexing the knee**. - It performs hip flexion (opposite of extension). *Short head of biceps femoris* - While part of the biceps femoris muscle, the **short head originates from the femur** (not ischial tuberosity) and **does not cross the hip joint**. - It acts exclusively on the knee joint, performing **knee flexion** and external rotation. - Because it does not cross the hip joint, it **cannot perform hip extension**, distinguishing it from the other hamstring components.

Q: Deltoid ligament is attached to all, except which structure?

Medial cuneiform. ***Medial cuneiform*** - The **deltoid ligament** is located on the **medial side of the ankle** and primarily connects the **tibia** to several tarsal bones. It does not attach to the medial cuneiform. - The **medial cuneiform** is a midfoot bone primarily involved in the **tarsometatarsal joint** and is not a direct attachment site for the deltoid ligament. *Medial malleolus* - The **medial malleolus**, the distal end of the **tibia**, serves as the **proximal attachment point** for all four parts of the deltoid ligament. - This strong connection is crucial for **stabilizing the ankle joint** medially. *Navicular bone* - The **tibionavicular part** of the deltoid ligament attaches to the **tuberosity of the navicular bone**. - This attachment helps **limit excessive abduction** and **eversion** of the foot. *Sustentaculum tali* - The **tibiocalcaneal part** of the deltoid ligament attaches to the **sustentaculum tali** on the calcaneus. - This attachment provides significant stability to the **subtalar joint**.

Q: "Overactivity of which of the nerves causes 'cissor gait', a condition characterized by one limb crossing in front of the other during stepping due to powerful hip adduction caused by continuous, unwanted nerve activity?"

Obturator nerve. ***Obturator nerve*** - The **obturator nerve** innervates the **adductor muscles of the thigh**, including the adductor longus, brevis, magnus, pectineus, and gracilis muscles. - Overactivity or spasticity of these muscles, often seen in conditions like **cerebral palsy** or **stroke**, leads to strong hip adduction, causing the legs to cross over in a **scissor gait** [1], [2]. *Femoral nerve* - The femoral nerve primarily innervates the **quadriceps femoris muscle**, responsible for **knee extension** and hip flexion. - Its overactivity would lead to excessive knee extension, not hip adduction or a scissor gait. *Inferior gluteal nerve* - The **inferior gluteal nerve** exclusively innervates the **gluteus maximus muscle**, which is responsible for **hip extension** and external rotation. - Hyperactivity of this nerve would affect hip extension, not cause excessive hip adduction. *Tibial nerve* - The **tibial nerve** innervates the **posterior compartment muscles of the leg** and the intrinsic muscles of the foot. - Its primary actions involve **plantarflexion of the foot** and flexion of the toes, and its overactivity would not directly lead to hip adduction.

Q: Which of the following statements is true regarding the saphenous opening?

Allows passage of the Great Saphenous Vein. ***Allows passage of the Great Saphenous Vein*** - The saphenous opening is a gap in the **fascia lata** that allows the **great saphenous vein** to pass through and drain into the **femoral vein** [1]. - This is the **primary anatomical and clinical significance** of the saphenous opening [1]. - This anatomical arrangement is crucial for venous return from the lower limb [1]. *Located superomedial to the pubic tubercle* - This is **incorrect** - the saphenous opening is actually located **inferolateral** (not superomedial) to the pubic tubercle. - It lies approximately 3-4 cm inferolateral to the pubic tubercle, within the **femoral triangle**. *Forms an opening in the fascia* - While technically true that it is an opening in the **fascia lata**, this statement is too **vague and non-specific**. - It doesn't specify which fascia or convey the functional/clinical significance of the opening. - The more precise answer identifies its primary function (passage of the great saphenous vein). *Covered by superficial fascia* - This is **misleading** - the saphenous opening is covered by the **cribriform fascia**, which is a specialized, perforated modification of the superficial fascia. - Saying it's simply "covered by superficial fascia" doesn't capture the specific anatomical structure (cribriform fascia) that fills this opening.

Q: The nutrient artery to the fibula arises from which artery?

Peroneal artery. ***Peroneal artery*** - The **peroneal artery** (also known as the fibular artery) is the primary blood supply to the fibula, giving rise to its largest **nutrient artery**. - This artery typically arises from the **posterior tibial artery** and courses along the posterior compartment of the leg, providing branches to the fibula. *Anterior tibial artery* - The **anterior tibial artery** primarily supplies the anterior compartment of the leg, including muscles and the tibia, but not the fibula's main nutrient artery. - It descends into the foot to become the **dorsalis pedis artery**. *Posterior tibial artery* - While the **peroneal artery** often originates from the posterior tibial artery, the posterior tibial artery itself does not directly give rise to the main **nutrient artery of the fibula**. - Its main function is to supply the posterior compartment muscles and the tibia, as well as several branches to the foot. *Popliteal artery* - The **popliteal artery** is a large artery in the posterior knee that bifurcates into the anterior and **posterior tibial arteries**. - It is too far proximal to directly give rise to the fibula's nutrient artery; its branches supply more proximal structures around the knee.

Q: Altered sensation over the area of the great saphenous vein in the leg is seen due to an injury to which of the following nerves?

Femoral. ***Femoral*** - The **femoral nerve** gives rise to the **saphenous nerve**, which runs with the great saphenous vein and provides sensation to the medial aspect of the leg and foot. - Injury to the femoral nerve or its saphenous branch can result in altered sensation in the distribution of the **great saphenous vein**. *Tibial* - The **tibial nerve** innervates muscles in the posterior compartment of the leg and provides sensation to the sole of the foot and parts of the ankle, not the area of the great saphenous vein. - Injury to the tibial nerve often leads to **motor deficits** (plantar flexion) and sensory loss on the bottom of the foot. *Sural* - The **sural nerve** provides sensation to the posterolateral aspect of the leg and the lateral side of the foot, distinct from the great saphenous vein's territory. - This nerve is often injured during procedures around the **lateral malleolus** or Achilles tendon. *Fibular* - The **fibular nerve** (also known as the common peroneal nerve) innervates the anterior and lateral compartments of the leg and provides sensation to the dorsum of the foot and lateral leg. - Injury typically results in **foot drop** and sensory loss **dorsum of foot**.

Question 1

Eversion occurs at which joint?

Accepted Answer

Subtalar

Answer

Ankle

Answer

Metatarsophalangeal

Answer

Interphalangeal

Question 2

Which lymph nodes drain the skin and fascia of the great toe?

Accepted Answer

Superficial inguinal lymph nodes

Answer

External iliac lymph nodes

Answer

Internal iliac lymph nodes

Answer

Deep inguinal lymph nodes

Question 3

Which of the following muscles is NOT a boundary of the popliteal fossa?

Accepted Answer

Adductor magnus

Answer

Biceps femoris

Answer

Lateral head of Gastrocnemius

Answer

Medial head of Gastrocnemius

Question 4

Which of the following hamstring muscles performs both hip extension and knee flexion?

Accepted Answer

Semimembranosus

Answer

Gracilis

Answer

Sartorius

Answer

Short head of biceps femoris

Question 5

Deltoid ligament is attached to all, except which structure?

Accepted Answer

Medial cuneiform

Answer

Sustentaculum tali

Answer

Navicular bone

Answer

Medial malleolus

Question 6

"Overactivity of which of the nerves causes 'cissor gait', a condition characterized by one limb crossing in front of the other during stepping due to powerful hip adduction caused by continuous, unwanted nerve activity?"

Accepted Answer

Obturator nerve

Answer

Femoral nerve

Answer

Inferior gluteal nerve

Answer

Tibial nerve

Question 7

Which of the following statements is true regarding the saphenous opening?

Accepted Answer

Allows passage of the Great Saphenous Vein

Answer

Forms an opening in the fascia

Answer

Covered by superficial fascia

Answer

Located superomedial to the pubic tubercle

Question 8

The nutrient artery to the fibula arises from which artery?

Accepted Answer

Peroneal artery

Answer

Anterior tibial artery

Answer

Posterior tibial artery

Answer

Popliteal artery

Question 9

Altered sensation over the area of the great saphenous vein in the leg is seen due to an injury to which of the following nerves?

Accepted Answer

Femoral

Answer

Fibular

Answer

Tibial

Answer

Sural

Lower Limb — MCQs

Lower Limb — MCQs

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