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Chapter 32H. Ultrasound-Guided Ankle Block

Which of the following nerves involved in ankle block is a terminal branch of the femoral nerve?

A. Deep peroneal nerve

B. Saphenous nerve

C. Sural nerve

D. Tibial nerve

B is correct. The saphenous nerve is a sensory branch of the femoral nerve.

A, C, and D are incorrect. These nerves are terminal branches of the sciatic nerve.

Which of the following is the correct sequence of the relevant structures in the vicinity of the tibial nerve from anterior to posterior?

A. Artery/nerve/vein, flexor hallucis longus tendon, flexor digitorum longus tendon, and tibialis posterior tendon

B. Flexor digitorum longus tendon, artery/nerve/vein, tibialis posterior tendon, and flexor hallucis longus tendon

C. Flexor digitorum longus tendon, tibialis posterior tendon, artery/nerve/vein, and flexor hallucis longus tendon

D. Tibialis posterior tendon, flexor digitorum longus tendon, artery/nerve/vein, and flexor hallucis longus tendon

D is correct. A useful mnemonic for the relevant structures in the vicinity is Tom, Dick ANd Harry, which refers to, from anterior to posterior, the tibialis posterior tendon, flexor digitorum longus tendon, artery/nerve/vein, and flexor hallucis longus tendon.

A, B, and C are incorrect sequences of the relevant structures in the vicinity of the tibial nerve from anterior to posterior.

Which of the following areas of the foot is innervated by the tibial nerve?

A. Dorsum of the foot

B. Heel and sole of the foot

C. Lateral margin of the foot and ankle

D. Web space between the first and second toes

B is correct. The tibial nerve is the largest of the five nerves at the ankle level and provides innervation to the heel and sole of the foot.

A is incorrect. The dorsum of the foot is innervated by the superficial peroneal nerve.

C is incorrect. The sural nerve innervates the lateral margin of the foot and ankle.

D is incorrect. The web space between first and second toes is innervated by the deep peroneal nerve.

The superficial peroneal nerve can be identified by placing the transducer:

A. Transversely on the leg, approximately ...

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