Lower Limb Practice Questions

Q: Which structure(s) passes behind the inguinal ligament:

All of the options. ***Correct: All of the options*** All three structures pass deep to (behind) the inguinal ligament as they transition from the pelvis/abdomen into the thigh [1]. The inguinal ligament forms the superior border of the femoral triangle [1]. ***Femoral branch of genitofemoral nerve (Correct)*** - Pierces the **psoas major** muscle and descends along its anterior surface - Passes through the **lacuna musculorum** (lateral compartment) deep to the inguinal ligament - Lies **lateral to the femoral artery** - Provides sensory innervation to the skin over the femoral triangle ***Femoral vein (Correct)*** - Continuation of the popliteal vein from the lower limb - Passes through the **lacuna vasorum** (medial compartment/femoral canal) within the **femoral sheath** - Located **medial to the femoral artery** behind the inguinal ligament [1] - Carries deoxygenated blood back to the heart via the external iliac vein ***Psoas major (Correct)*** - Major hip flexor muscle originating from lumbar vertebrae (T12-L5) - Passes through the **lacuna musculorum** deep to the inguinal ligament - Located **lateral to the femoral vessels** - Combines with iliacus to form iliopsoas, inserting on the lesser trochanter of femur

Q: Tibialis posterior is inserted in all of the following bones distally, except for which of the following?

Talus. ***Talus*** - The **tibialis posterior muscle inserts** primarily into the **navicular, cuneiforms (medial, intermediate, lateral), cuboid**, and the bases of the **2nd, 3rd, and 4th metatarsals**. - The **talus** is a crucial bone in the ankle joint but does not serve as an insertion point for the tibialis posterior. *Metatarsal 2* - The tibialis posterior has **tendinous slips** that insert onto the **bases of the 2nd, 3rd, and 4th metatarsals**, contributing to the support of the medial longitudinal arch. - This insertion point helps in the muscle's function of **plantarflexion and inversion** of the foot. *Navicular bone* - The **navicular tuberosity** is a major insertion site for the tibialis posterior tendon, making it a key anatomical landmark for palpation. - Its strong attachment here is crucial for the muscle's role in **inverting the foot** and supporting the **medial longitudinal arch. *Intermediate cuneiform* - One of the **three cuneiform bones**, the intermediate cuneiform, receives an insertion from the tibialis posterior tendon. - This attachment point, along with others, allows the tibialis posterior to **control foot mechanics** and provide stability.

Q: Tarsal tunnel syndrome involves

Posterior tibial nerve. ***Posterior tibial nerve*** - **Tarsal tunnel syndrome** is an entrapment neuropathy caused by compression of the **posterior tibial nerve** or its branches as it passes through the tarsal tunnel. - Symptoms include pain, numbness, and tingling in the sole of the foot and toes, exacerbated by activity. *Common peroneal nerve* - The **common peroneal nerve** is more commonly associated with injury around the neck of the fibula, leading to **foot drop**. - It does not pass through the tarsal tunnel and is therefore not involved in tarsal tunnel syndrome. *Sciatic nerve* - The **sciatic nerve** is the largest nerve in the body and runs down the back of the leg, giving rise to the common peroneal and tibial nerves. - Entrapment of the sciatic nerve typically occurs in the buttock or thigh, causing **sciatica**, not localized foot pain related to the tarsal tunnel. *Lateral cutaneous nerve of thigh* - The **lateral cutaneous nerve of the thigh** supplies sensation to the lateral aspect of the thigh. - Entrapment of this nerve causes **meralgia paresthetica**, characterized by burning pain and numbness on the outer thigh, unrelated to the foot.

Q: Which of the following muscles inserts into the rough impression on the anterior surface of the greater trochanter?

Gluteus minimus. ***Gluteus minimus*** - The **gluteus minimus** muscle is the deepest of the gluteal muscles and its primary insertion point is on the **anterior surface of the greater trochanter of the femur**. - This muscle is crucial for **abduction** and **medial rotation of the thigh** at the hip joint. *Gluteus maximus* - The **gluteus maximus** inserts primarily into the **iliotibial tract** and the **gluteal tuberosity** of the femur, not the anterior aspect of the greater trochanter. - This muscle is the main extensor of the hip joint, powerful in actions like climbing stairs. *Gluteus medius* - The **gluteus medius** inserts onto the **lateral surface of the greater trochanter**, specifically on its supero-posterior aspect. - Its main roles include **abduction and stabilization of the pelvis** during walking. *Piriformis* - The **piriformis** muscle originates from the anterior surface of the sacrum and inserts onto the **superior border of the greater trochanter**, not its anterior surface. - It plays a role in **external rotation, abduction, and extension of the hip**.

Q: Which of the following nerves does not supply the muscles of the gluteal region?

Sciatic nerve. ***Sciatic nerve*** - The **sciatic nerve** passes through the gluteal region to supply muscles of the **posterior thigh** and virtually all muscles below the knee. - While it traverses the region, it does not directly innervate any of the primary **gluteal muscles**. *Superior gluteal nerve* - This nerve is crucial for innervating the **gluteus medius**, **gluteus minimus**, and **tensor fasciae latae** muscles. - These muscles are vital for **abduction** and **medial rotation** of the thigh, and a lesion to this nerve can cause a **Trendelenburg gait**. *Inferior gluteal nerve* - The **inferior gluteal nerve** exclusively supplies the **gluteus maximus**, the largest muscle of the gluteal region. - The **gluteus maximus** is the primary extensor of the thigh, essential for actions like **climbing stairs** and standing up. *Nerve to obturator internus* - This nerve directly supplies the **obturator internus** and **gemellus superior** muscles, which are part of the deep gluteal muscles. - These muscles function as **lateral rotators** of the thigh.

Q: Name the marked structure in the image.

Gracilis. ***Gracilis*** - The highlighted structure is the **gracilis muscle**, a long, strap-like muscle located on the **medial aspect of the thigh** - It originates from the **body and inferior ramus of the pubis** and inserts into the **medial surface of the proximal tibia** (pes anserinus) - It is the most **superficial muscle of the medial compartment of the thigh** - Functions: **Adduction of the thigh** at the hip; **flexion and medial rotation of the leg** at the knee - Innervation: **Obturator nerve** *Vastus lateralis* - This is the **largest component of the quadriceps femoris**, located on the **lateral aspect of the thigh** - It is a powerful **knee extensor**, running vertically on the lateral thigh - Does not lie along the medial thigh like the structure shown *Rectus femoris* - This is the **most superficial and anterior component of the quadriceps femoris** - It is the only quadriceps muscle that crosses **two joints** (hip and knee) - Located anteriorly in the thigh, not along the medial thigh like gracilis *Vastus medialis* - This is a component of the **quadriceps femoris** located on the **anteromedial aspect of the thigh** - It is part of the **knee extensor mechanism** - The vastus medialis is broader and more bulky compared to the thin, strap-like gracilis

Q: All are possible during contraction of the tensor fasciae latae muscle except.

Quadratus femoris. ***Quadratus femoris*** - The **tensor fasciae latae (TFL)** functions as a **hip flexor**, **abductor**, and **internal rotator**. - The **quadratus femoris** is a powerful **external rotator** of the hip, making it a direct antagonist to TFL's internal rotation action. - During typical TFL contraction, the quadratus femoris would be **inhibited** due to reciprocal innervation, making simultaneous contraction highly unlikely. - This is the **least likely** muscle to contract during TFL activation. *Gluteus medius* - Primary **hip abductor** with anterior fibers assisting in **internal rotation**. - Acts **synergistically** with TFL for both abduction and internal rotation. - **Commonly contracts** simultaneously with TFL during gait and standing. *Obturator internus* - Primarily an **external rotator**, but also functions as a hip **stabilizer**. - Despite being an external rotator, it can contract with TFL in **complex stabilization movements** and postural adjustments. - Its stabilizing role makes simultaneous contraction **possible** in certain functional contexts. *Piriformis* - Functions as an **external rotator** and **abductor** when the hip is flexed. - Can act as a **hip stabilizer** and may contract with TFL during complex movements requiring fine motor control. - While primarily an antagonist, simultaneous contraction is **possible** for stabilization.

Q: Which of the following statements about the adductors of the thigh is correct?

Adductor brevis is the shortest adductor muscle. ***Adductor brevis is the shortest adductor muscle*** - The **adductor brevis** is the shortest muscle among the adductor group in the thigh. - The three main adductors by size: **adductor magnus** (longest and largest) > **adductor longus** (intermediate) > **adductor brevis** (shortest). - Adductor brevis lies deep to pectineus and adductor longus, and plays a key role in **thigh adduction**. *The ischial head of adductor magnus is not an adductor muscle.* - The **ischial/hamstring part of adductor magnus** does contribute to adduction despite its primary action being hip extension like other hamstrings. - It also acts on the **hip joint** to extend the thigh, but its adductor action is functionally important. *The main blood supply to the adductors is from the profunda femoris artery.* - While the **profunda femoris artery (deep femoral artery)** supplies the posterior and lateral compartments of the thigh, the adductors primarily receive blood from the **obturator artery** and branches of the femoral artery. - The **obturator artery** is specifically known for supplying the adductor muscles of the medial compartment. *The adductor magnus is the largest muscle in the thigh.* - The **adductor magnus** is the largest muscle in the adductor group, but not the largest muscle in the entire thigh. - The **quadriceps femoris group** (vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris) collectively forms the largest muscle mass in the thigh.

Q: Which metatarsal is known for its significant mobility in the foot?

1st metatarsal. ***1st metatarsal*** - The **first metatarsal** is highly mobile, articulated with the **medial cuneiform** by a saddle-shaped joint, allowing for significant motion critical for foot adaptation during gait. - Its mobility is crucial for **pronation and supination** of the foot, impacting load distribution and stability, especially during toe-off. *2nd metatarsal* - The **second metatarsal** is the **least mobile** of the metatarsals, deeply recessed and articulated with the three cuneiforms, forming a key part of the **Lisfranc joint complex**. - Its relative rigidity contributes to the **stability** of the midfoot and acts as a central pillar, providing a stable base for the other metatarsals. *3rd metatarsal* - The **third metatarsal** has **limited mobility**, articulating primarily with the **lateral cuneiform**. - While it has some translational and rotational movement, it is significantly less mobile than the first metatarsal and plays a role in the stability of the central ray of the foot. *4th metatarsal* - The **fourth metatarsal** exhibits **moderate mobility**, greater than the second and third but less than the first. - It articulates with the **cuboid** and **lateral cuneiform**, providing flexibility important for adapting the forefoot to uneven surfaces.

Q: Which structure passes deep to the inguinal ligament in the vascular compartment?

Femoral vein. ***Femoral vein*** - The **femoral vein** passes deep to the inguinal ligament within the **femoral sheath** in the **vascular compartment (lacuna vasorum)**. - It lies medial to the **femoral artery** within the femoral triangle and continues superiorly as the external iliac vein. - The femoral vein is the major venous structure passing through this compartment. *Psoas major* - The **psoas major muscle** (along with iliacus as the iliopsoas) passes deep to the inguinal ligament through the **muscular compartment (lacuna musculorum)**, which is lateral to the vascular compartment. - It is separated from the vascular structures by the iliopectineal arch. *Femoral branch of genitofemoral nerve* - The **femoral branch of the genitofemoral nerve** does pass through the vascular compartment, but it is a small nerve branch that accompanies the vessels, not the primary structure defining this compartment [1]. - It supplies sensation to the skin of the upper anterior thigh. *Superficial epigastric artery* - The **superficial epigastric artery** arises from the **femoral artery** approximately 1 cm **distal to** (below) the inguinal ligament [2]. - It does **not** pass deep to the inguinal ligament but rather originates below it and ascends superficially on the anterior abdominal wall [2].

Question 1

Which structure(s) passes behind the inguinal ligament:

Accepted Answer

All of the options

Answer

Femoral branch of genitofemoral nerve

Answer

Femoral vein

Answer

Psoas major

Question 2

Tibialis posterior is inserted in all of the following bones distally, except for which of the following?

Accepted Answer

Talus

Answer

Metatarsal 2

Answer

Navicular bone

Answer

Intermediate cuneiform

Question 3

Tarsal tunnel syndrome involves

Accepted Answer

Posterior tibial nerve

Answer

Common peroneal nerve

Answer

Sciatic nerve

Answer

Lateral cutaneous nerve of thigh

Question 4

Which of the following muscles inserts into the rough impression on the anterior surface of the greater trochanter?

Accepted Answer

Gluteus minimus

Answer

Gluteus maximus

Answer

Gluteus medius

Answer

Piriformis

Question 5

Which of the following nerves does not supply the muscles of the gluteal region?

Accepted Answer

Sciatic nerve

Answer

Nerve to obturator internus

Answer

Inferior gluteal nerve

Answer

Superior gluteal nerve

Question 6

Name the marked structure in the image.

Accepted Answer

Gracilis

Answer

Vastus lateralis

Answer

Vastus medialis

Answer

Rectus femoris

Question 7

All are possible during contraction of the tensor fasciae latae muscle except.

Accepted Answer

Quadratus femoris

Answer

Gluteus medius

Answer

Obturator internus

Answer

Piriformis

Question 8

Which of the following statements about the adductors of the thigh is correct?

Accepted Answer

Adductor brevis is the shortest adductor muscle

Answer

The main blood supply to the adductors is from the profunda femoris artery.

Answer

The ischial head of adductor magnus is not an adductor muscle.

Answer

The adductor magnus is the largest muscle in the thigh.

Question 9

Which metatarsal is known for its significant mobility in the foot?

Accepted Answer

1st metatarsal

Answer

3rd metatarsal

Answer

4th metatarsal

Answer

2nd metatarsal

Question 10

Which structure passes deep to the inguinal ligament in the vascular compartment?

Accepted Answer

Femoral vein

Answer

Psoas major

Answer

Femoral branch of genitofemoral nerve

Answer

Superficial epigastric artery

Lower Limb — MCQs

Lower Limb — MCQs

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