Posterior Thigh Anatomy Quiz

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Questions and Answers

Which muscle is NOT considered a part of the hamstrings?

  • Biceps femoris
  • Semimembranosus
  • Rectus femoris (correct)
  • Semitendinosus

What is the primary action of the semimembranosus muscle?

  • Knee flexion (correct)
  • Hip abduction
  • Knee extension
  • Hip flexion

Which blood vessel supplies the posterior compartment of the thigh?

  • Tibial artery
  • Femoral artery
  • Perforating branches of profunda femoris artery (correct)
  • Popliteal artery

What is the nerve supply to the hamstring muscles?

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

Which of the following statements about the sciatic nerve is correct?

<p>It divides into the tibial and common fibular nerves proximal to the knee. (B)</p> Signup and view all the answers

Which muscle provides lateral rotation of the knee?

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

What is the function of the adductor part of the adductor magnus muscle?

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

Where does the long head of the biceps femoris originate?

<p>Ischial tuberosity (B)</p> Signup and view all the answers

Which muscles are innervated by the tibial part of the sciatic nerve?

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

What is the primary function of the popliteal fossa?

<p>It acts as a passage for structures between the thigh and leg. (C)</p> Signup and view all the answers

Which nerve innervates the short head of biceps femoris?

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

What forms the floor of the popliteal fossa?

<p>Popliteal surface of the femur and popliteus muscle (B)</p> Signup and view all the answers

What is the continuation of the femoral artery known as?

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

What arterial branches does the popliteal artery give off?

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

Which structure is NOT found within the contents of the popliteal fossa?

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

What is the primary role of the tibial nerve in the leg?

<p>Innervate all muscles in the posterior compartment of the leg (C)</p> Signup and view all the answers

Flashcards

Posterior Compartment of the Thigh

The back of the thigh. Contains the hamstrings, sciatic nerve, and perforating branches of the profunda femoris artery.

Hamstrings

The group of muscles that help extend the hip and flex the knee.

Biceps Femoris

The longest muscle of the hamstring group

Semitendinosus

A hamstring muscle that helps extend the hip and flex the knee, also helps with medial (internal) rotation of the leg.

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Semimembranosus

A hamstring muscle that is involved in extending the hip, flexing the knee, and medially (internally) rotating the leg.

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Posterior Part of Adductor Magnus

The part of the adductor magnus muscle that acts as a hamstring, aiding in hip adduction and medial (internal) rotation of the leg.

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Sciatic Nerve

The major nerve of the posterior thigh, it descends from the gluteal region and innervates the hamstring muscles.

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Perforating branches of Profunda Femoris Artery

The branches of the profunda femoris artery that supply blood to the posterior compartment of the thigh.

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Tibial Nerve

The tibial nerve, a branch of the sciatic nerve, supplies muscles in the posterior compartment of the thigh and continues into the leg and foot. It innervates muscles responsible for flexing the knee, plantarflexing the foot, and inverting the foot.

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Common Fibular Nerve

The common fibular nerve, also branching from the sciatic nerve, supplies muscles in the thigh, leg, and foot. It innervates muscles involved in extending the knee, dorsiflexing the foot, and everting the foot.

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Popliteal Fossa

A diamond-shaped space behind the knee joint, the popliteal fossa serves as a pathway for structures passing between the thigh and leg.

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Lateral Boundary of Popliteal Fossa

Located laterally in the popliteal fossa, the biceps femoris muscle is above, while the lateral head of gastrocnemius and plantar muscles lie below.

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Medial Boundary of Popliteal Fossa

The medial boundary of the popliteal fossa is defined by semimembranosus and semitendinosus muscles above and the medial head of gastrocnemius below.

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Floor of Popliteal Fossa

The popliteal surface of the femur and the popliteus muscle form the floor of the popliteal fossa.

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Popliteal Artery

The popliteal artery, a continuation of the femoral artery, passes through the popliteal fossa and divides into the anterior and posterior tibial arteries.

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Genicular Branches of Popliteal Artery

The popliteal artery gives off five genicular branches to form a network of blood vessels around the knee joint. These branches include superior lateral, superior medial, middle, inferior lateral, and inferior medial genicular arteries.

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Study Notes

Back of Thigh and Popliteal Fossa

  • The sciatic nerve runs through the posterior thigh compartment and innervates the muscles there
  • Perforating branches of the profunda femoris artery supply blood to the muscles
  • The sciatic nerve branches into tibial and common fibular nerves
  • The four hamstring muscles are Biceps femoris, Semitendinosus, Semimembranosus, and part of Adductor magnus

Posterior Compartment of Thigh Muscles

  • Hip extensors and knee flexors are the functions of the muscles in this compartment
  • The gluteus maximus, gluteus medius, and gluteus minimus are hip extensors
  • Muscles such as the biceps femoris, semitendinosus, semimembranosus, and quadratus femoris are knee flexors and thigh extensors

Popliteal Fossa

  • The popliteal fossa is a diamond-shaped space behind the knee
  • It's a transitional area between the thigh and leg
  • Important structures passing through include blood vessels and nerves
  • Boundaries of the popliteal fossa are defined by muscles (Biceps femoris, Gastrocnemius, Plantaris, Semimembranosus, and Semitendinosus).
  • The floor of the fossa is the popliteal surface of the femur and the popliteus muscle
  • The roof is skin and fascia
  • Contents include popliteal artery, vein, nerves, and lymph nodes

Popliteal Artery

  • The continuation of the femoral artery after passing through the adductor hiatus
  • Divides into anterior and posterior tibial arteries
  • Gives off genicular branches in the popliteal fossa
  • These genicular branches form anastomoses (connections) with other arteries

Tibial Nerve

  • A branch of the sciatic nerve
  • Supplies muscles in the posterior compartment of the thigh (long head of biceps femoris, semimembranosus, semitendinosus)
  • It descends through the popliteal fossa, enters the posterior compartment of the leg and continues into the sole of the foot
  • Innervates all muscles in the posterior compartment of the leg

Common Fibular Nerve

  • A branch of the sciatic nerve
  • Innervates the short head of biceps femoris in the posterior compartment of the thigh
  • Continues into the lateral and anterior compartments of leg and foot

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