Obturator Nerve Anatomy and Clinical Notes Quiz
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Questions and Answers

Which nerve is responsible for the innervation of the gluteus medius and gluteus minimus muscles?

  • Posterior femoral cutaneous nerve
  • Sciatic nerve
  • Superior gluteal nerve (correct)
  • Inferior gluteal nerve

    • What is the largest nerve originating from the lumbosacral plexus?

  • Tibial nerve
  • Posterior femoral cutaneous nerve
  • Common peroneal (fibular) nerve
  • Sciatic nerve (correct)

    • Which of the following nerves innervates the muscles of the posterior thigh?

  • Tibial nerve
  • Inferior gluteal nerve
  • Posterior femoral cutaneous nerve (correct)
  • Common peroneal (fibular) nerve

    • Which of the following is the most superficial structure in the popliteal fossa?

    <p>Tibial nerve</p> Signup and view all the answers

    Which nerve is responsible for the innervation of the gluteus maximus muscle?

    <p>Inferior gluteal nerve</p> Signup and view all the answers

    What is the terminal branch of the sciatic nerve that innervates the muscles of the posterior compartment of the leg?

    <p>Tibial nerve</p> Signup and view all the answers

    Which nerve is responsible for the innervation of the tensor fasciae latae muscle?

    <p>Superior gluteal nerve</p> Signup and view all the answers

    Which of the following nerves is responsible for the innervation of the muscles in the anterior compartment of the leg?

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

    Which of the following muscles is NOT innervated by the tibial nerve?

    <p>Gluteus maximus</p> Signup and view all the answers

    Which of the following is NOT a motor branch of the deep fibular (peroneal) nerve?

    <p>Flexor hallucis longus</p> Signup and view all the answers

    Which of the following is a sensory branch of the sural nerve?

    <p>Lateral sural cutaneous nerve</p> Signup and view all the answers

    What is the primary function of the plantar nerves (medial and lateral) in the foot?

    <p>Motor innervation of the intrinsic foot muscles</p> Signup and view all the answers

    Which of the following is NOT a motor branch of the superficial fibular (peroneal) nerve?

    <p>Extensor digitorum brevis</p> Signup and view all the answers

    What is the primary function of the sural nerve and its branches?

    <p>Sensory innervation of the posterior and lateral aspects of the leg and foot</p> Signup and view all the answers

    Which of the following nerves is responsible for the dorsiflexion of the foot?

    <p>Deep fibular (peroneal) nerve</p> Signup and view all the answers

    What is the primary function of the structures passing anterior to the medial malleolus?

    <p>Motor innervation of the intrinsic foot muscles</p> Signup and view all the answers

    What is the primary function of the obturator nerve?

    <p>Adduction and medial rotation of the thigh</p> Signup and view all the answers

    What is the main nerve of the perineum responsible for sensory branches to the skin of the perineum and external genital organs?

    <p>Pudendal nerve</p> Signup and view all the answers

    Which muscle is innervated by the accessory obturator nerve?

    <p>Pectineus</p> Signup and view all the answers

    Which nerve root(s) contribute to the formation of the obturator nerve?

    <p>L3-L4</p> Signup and view all the answers

    In a patient with an inferior gluteal nerve injury, which muscle is affected?

    <p>Gluteus maximus</p> Signup and view all the answers

    Which clinical sign is associated with an injury to the obturator nerve?

    <p>Diminished adduction and lateral rotation of the thigh</p> Signup and view all the answers

    Which nerve injury can result in foot drop due to gravity-induced sensory loss in the leg and foot?

    <p>Common Peroneal nerve</p> Signup and view all the answers

    Which nerve root(s) contribute to the formation of the sacral plexus?

    <p>S1-S4</p> Signup and view all the answers

    What is the clinical significance of a positive Trendelenburg sign?

    <p>Weakness of gluteus medius and minimus muscles</p> Signup and view all the answers

    Which nerve branch of the sacral plexus innervates the piriformis muscle?

    <p>Nerve to piriformis</p> Signup and view all the answers

    Which muscle is paralyzed in a patient with superior gluteal nerve injury when raising the foot on the normal side?

    <p>Gluteus maximus</p> Signup and view all the answers

    What muscles are affected by a sciatic nerve injury resulting in leg paralysis?

    <p>All muscles in the leg except those innervated by the tibial nerve</p> Signup and view all the answers

    Which nerve branch of the sacral plexus is primarily responsible for the sensory innervation of the posterior thigh?

    <p>Posterior femoral cutaneous nerve</p> Signup and view all the answers

    Which nerve branch of the sacral plexus innervates the external anal sphincter and perineal muscles?

    <p>Pudendal nerve</p> Signup and view all the answers

    What is the nerve responsible for innervating the obturator internus muscle?

    <p>Nerve to obturator internus</p> Signup and view all the answers

    Which muscle action results in fixing the 12th rib?

    <p>Quadratus lumborum</p> Signup and view all the answers

    Which muscle acts to balance the trunk?

    <p>Psoas major</p> Signup and view all the answers

    Which nerve innervates the Iliopsoas muscle?

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

    Which nerve innervates the adductor longus and gracilis muscles?

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

    Which muscle extends and laterally flexes the vertebral column?

    <p>Quadratus lumborum</p> Signup and view all the answers

    What is an additional function of the Psoas major muscle besides acting inferiorly with the iliacus?

    <p>Balances the trunk</p> Signup and view all the answers

    Which nerve provides sensory branches to the skin over the anterolateral aspect of the thigh until the knee joint?

    <p>Lateral femoral cutaneous nerve</p> Signup and view all the answers

    Which muscle is responsible for flexing the thigh and stabilizing the hip joint?

    <p>Iliacus</p> Signup and view all the answers

    What is the function of the genitofemoral nerve's genital branch?

    <p>Supplying sensory innervation to mons pubis and labium majus</p> Signup and view all the answers

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