Lower Limb Anatomy Quiz

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Questions and Answers

Which of the following muscles is NOT part of the anterior compartment of the thigh?

  • Biceps femoris (correct)
  • Sartorius
  • Rectus femoris
  • Vastus lateralis

Which landmark serves as the superior boundary of the anterior femoral triangle?

  • Femoral nerve
  • Inguinal ligament (correct)
  • Adductor longus muscle
  • Sartorius muscle

What is the main action performed by the quadriceps femoris?

  • Adducts the hip
  • Extends the knee (correct)
  • Flexes the knee
  • Rotates the thigh laterally

Which nerve supplies the sartorius muscle?

<p>Femoral nerve (B)</p> Signup and view all the answers

What nerve is primarily responsible for innervating the iliacus muscle?

<p>Femoral nerve (A)</p> Signup and view all the answers

What structure exits the anterior femoral triangle and passes through the adductor canal?

<p>Femoral artery (D)</p> Signup and view all the answers

The vastus intermedius muscle is primarily responsible for which action?

<p>Knee extension (D)</p> Signup and view all the answers

Which structure is NOT found in the femoral triangle?

<p>Obturator nerve (C)</p> Signup and view all the answers

Which muscle forms the medial boundary of the adductor canal?

<p>Sartorius (A)</p> Signup and view all the answers

Which of the following structures is NOT a content of the femoral sheath?

<p>Femoral nerve (C)</p> Signup and view all the answers

Which compartment of the thigh is responsible for the flexion of the knee?

<p>Posterior compartment (D)</p> Signup and view all the answers

What is the nerve supply for the psoas major muscle?

<p>L1-L3 nerves (A)</p> Signup and view all the answers

The profunda femoris artery is considered the main blood supply of which region?

<p>Thigh (C)</p> Signup and view all the answers

The iliacus muscle primarily performs which action?

<p>Hip flexion (D)</p> Signup and view all the answers

What is the primary role of the saphenous nerve?

<p>Sensory supply to the skin of the medial side of the foot (A)</p> Signup and view all the answers

Which of the following correctly describes the femoral nerve?

<p>It enters the thigh deep to the inguinal ligament. (D)</p> Signup and view all the answers

Which of the following is a muscle that does NOT contribute to hip flexion?

<p>Vastus medialis (B)</p> Signup and view all the answers

Which blood vessels are primarily associated with the anterior compartment of the thigh?

<p>Femoral vessels (C)</p> Signup and view all the answers

Which artery connects with branches of the popliteal artery after passing through the adductor muscles?

<p>Deep artery of thigh (D)</p> Signup and view all the answers

What is the primary nerve supply for the medial compartment of the thigh muscles?

<p>Obturator nerve (D)</p> Signup and view all the answers

Which muscle is primarily responsible for adducting the thigh at the hip joint?

<p>Adductor brevis (A)</p> Signup and view all the answers

Where does the great saphenous vein connect with the femoral vein?

<p>Through the saphenous ring (B)</p> Signup and view all the answers

Which artery is a branch of the internal iliac artery and enters the medial compartment of the thigh?

<p>Obturator artery (D)</p> Signup and view all the answers

Which muscle acts to flex the leg at the knee joint while also adducting the thigh?

<p>Gracilis (A)</p> Signup and view all the answers

Which ligament does the femoral vein pass under to become the external iliac vein?

<p>Inguinal ligament (C)</p> Signup and view all the answers

Which muscle primarily contributes to lateral rotation of the thigh at the hip joint?

<p>Obturator externus (B)</p> Signup and view all the answers

Which part of the adductor magnus is innervated by the sciatic nerve?

<p>Hamstring part (A)</p> Signup and view all the answers

What is the action of the adductor longus muscle?

<p>Adducts and medially rotates the thigh (A)</p> Signup and view all the answers

Flashcards

Quadriceps Femoris

The thigh muscle that extends the knee and flexes the hip (when it contracts). It's comprised of four heads: Rectus femoris, Vastus lateralis, Vastus medialis, and Vastus intermedius.

Anterior Compartment of Thigh

The thigh compartment responsible for extending the knee.

Femoral Triangle

A large, triangular space in the anterior thigh containing the femoral artery, vein, and nerve.

Sartorius

The long, slender muscle that flexes the knee, abducts and laterally rotates the thigh, and helps with hip flexion.

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Psoas Major

The large muscle that flexes the hip and laterally rotates the thigh. It originates in the lumbar vertebrae.

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Iliacus

The muscle that flexes the hip and laterally rotates the thigh. It lies along the iliac fossa.

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Rectus Femoris

The large muscle that flexes the hip and extends the knee when it contracts.

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Hip Flexor

A strong muscle that flexes the hip.

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Hamstring Muscles

Powerful muscles located in the posterior compartment of the thigh that extend the knee joint.

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Femoral Nerve

Includes the muscles that extend the leg, flexing the thigh, and also helps with hip flexion.

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Deep Artery of Thigh (Profunda Femoris Artery)

The deep artery of the thigh, also known as the profunda femoris artery, runs deep within the thigh, supplying muscles and tissues of the posterior thigh compartment.

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Femoral vein

The main deep vein of the lower limb, it drains blood from the thigh and becomes the external iliac vein as it enters the abdomen.

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Great Saphenous vein

This superficial vein originates in the foot and runs along the medial side of the leg, knee, and thigh to connect with the femoral vein.

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Medial Compartment of Thigh muscles

The three adductors (Adductor Longus, Brevis, and Magnus), Gracilis, Pectineus, and Obturator Externus constitute the muscle group of the medial thigh compartment.

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Blood Supply of Medial Compartment

The deep artery of the thigh along with the obturator artery provide blood supply to the medial compartment of the thigh.

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Nerve Supply of Medial Compartment

The obturator nerve innervates the muscles of the medial thigh compartment, providing neural control for movement.

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Adductor Longus

Adductor Longus originates from the pubic bone and inserts on the femur, enabling adduction and medial rotation of the thigh at the hip joint.

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Adductor Brevis

Adductor Brevis originates from the pubic bone and inserts on the femur, contributing to thigh adduction at the hip joint.

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Adductor Magnus

Adductor Magnus, with its two main parts, originates from the ischium and inserts on the femur, performing adduction and medial rotation of the thigh.

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Gracilis

Gracilis originates from the pubic bone and inserts on the tibia, contributing to thigh adduction and leg flexion at the knee joint.

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What is the Anterior Femoral Triangle?

A triangular space located on the medial aspect of the thigh, just below the inguinal ligament. It is bordered by the inguinal ligament superiorly, sartorius muscle laterally, and adductor longus muscle medially. It houses important structures like the femoral nerve, femoral artery, and femoral vein.

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What is the Adductor (Subsartorial) Canal?

A long, narrow passageway in the middle third of the thigh. It extends from the apex of the femoral triangle to the adductor hiatus in the tendon of the adductor magnus. It is bounded by the vastus medialis, adductors longus and magnus, and sartorius. It contains the femoral artery, femoral vein, saphenous nerve, and nerve to vastus medialis.

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What is the Femoral Nerve?

The largest branch of the lumbar plexus, it comes from nerve roots L2, L3, and L4. It originates within the psoas muscle, enters the thigh deep to the inguinal ligament, and divides into terminal branches. It supplies motor and sensory nerves to the thigh and leg, including the quadriceps femoris muscle and the skin of the medial side of the leg and foot.

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What is the Femoral Artery?

A continuation of the external iliac artery, it passes deep to the inguinal ligament descends vertically in the femoral triangle before exiting through the adductor canal and becoming the popliteal artery. It supplies blood to the thigh and surrounding structures.

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What is the Profunda Femoris Artery?

The largest branch of the femoral artery, responsible for providing the main blood supply to the thigh.

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What is the Iliacus Muscle?

A muscle located in the iliac fossa, it helps flex the hip joint and plays a role in stabilising the hip. It's innervated by the femoral nerve.

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What are the Adductor Muscles?

A group of muscles that adduct the thigh and rotate it. They are located on the medial side of the thigh and receive innervation from the obturator nerve.

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What is the Sartorius Muscle?

A large muscle located in the anterior thigh. It helps with hip flexion and knee extension. It is innervated by the femoral nerve.

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Study Notes

Lower Limb Regions

  • The lower limb is divided into six regions: gluteal (buttock), femoral (thigh), knee joint, leg region, ankle joint, and foot.

Thigh Compartments

  • The thigh is divided into three compartments by intermuscular septa:
    • Anterior (extensor)
    • Posterior (flexor)
    • Medial (adductor)

Anterior Thigh Compartment

  • Muscles: Hip flexors (quadriceps femoris, sartorius, psoas major, and iliacus).
  • Blood Vessels: Femoral vessels and great saphenous vein.
  • Nerves: Femoral nerve.
  • Structures: Femoral triangle, femoral sheath, and adductor canal.
  • Quadriceps femoris: Composed of four muscles:
    • Rectus femoris
    • Vastus medialis
    • Vastus intermedius
    • Vastus lateralis
  • Nerve supply: Femoral nerve
  • Action: Knee extension and hip flexion (rectus femoris)

Posterior Thigh Compartment

  • This section details muscles, blood vessels, nerves, and other relevant structures, but the specific specifics from the provided images are not listed here.

Medial Thigh Compartment

  • Muscles: Adductors (longus, brevis, magnus), gracilis, pectineus, and obturator externus.
  • Blood Supply: Deep artery of the thigh and obturator artery.
  • Nerve Supply: Obturator nerve.

Sartorius Muscle

  • Description: An oblique muscle.
  • Nerve Supply: Femoral nerve
  • Action: Knee flexion, hip flexion, thigh abduction, and lateral rotation.

Psoas Major and Iliacus

  • Nerve supply: Psoas major - L1-L3 nerves; Iliacus - Femoral nerve
  • Action: Hip flexion, thigh lateral rotation

Femoral Triangle

  • Boundaries: Inguinal ligament, sartorius muscle, adductor longus muscle
  • Floor: Composed of iliopsoas, pectineus, and adductor longus muscles.
  • Roof: Skin and fasciae of the thigh.
  • Contents: Femoral nerve and its branches, femoral sheath and its contents(femoral artery and vein and several branches), the great saphenous and deep femoral veins, deep inguinal lymph nodes, and associated lymphatic vessels.

Adductor Canal

  • Boundaries: vastus medialis, adductors longus and magnus, and sartorius.
  • Contents: femoral artery and vein, saphenous nerve, and the nerve to vastus medialis.

Femoral Nerve

  • Description: Largest branch of the lumbar plexus (L2, 3, 4).
  • Branches: Anterior cutaneous branches, motor branches, and saphenous nerve.

Femoral Artery

  • Branches:
    • Superficial epigastric artery
    • Superficial circumflex iliac artery
    • Superficial external pudendal artery
    • Deep external pudendal artery
    • Profunda femoris artery
  • Description: Continuation of the external iliac artery after passing deep to the inguinal ligament.
  • Descends vertically in the femoral triangle, exits through the adductor canal, and continues as the popliteal artery.

Deep Artery of the Thigh (Profunda Femoris Artery)

  • Description: Largest branch of the femoral artery, providing the main blood supply to the thigh.
  • Branches: Lateral circumflex femoral artery, medial circumflex femoral artery, and four perforating arteries.

Femoral Vein

  • Description: Major deep vein draining the limb, becoming the external iliac vein under the inguinal ligament.
  • Tributaries: Follow branches of the femoral artery (vena comittantes).

Great Saphenous Vein

  • Origin: Medial side of the dorsal venous arch.
  • Course: Ascends up the medial side of the leg, knee, and thigh.
  • Connection: Connects with the femoral vein through the saphenous ring in the deep fascia inferior to the inguinal ligament.

Muscles of Medial Compartment of the Thigh

  • Adductors (longus, brevis, magnus), gracilis, pectineus, and obturator externus.

Obturator Artery

  • Origin: Branch of the internal iliac artery.
  • Course: Enters the medial compartment of the thigh through the obturator canal.
  • Bifurcation: Bifurcates into an anterior and posterior branch, forming a channel around the obturator membrane, which lies within the obturator externus muscle's attachment.

Obturator Nerve

  • Origin: Lumbar plexus (L2, 3, 4).
  • Course: Emerges on the medial border of the psoas muscle within the abdomen, reaching the obturator foramen and dividing into anterior and posterior divisions.

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