Neurology of foot

Question 1

What does the medial plantar nerve supply?

Answer 1

• Abductor hallucis
• Flexor Hallucis Brevis
• Flexor Digitorium Brevis
• Lumbricals 2/3

at risk

• Proper branch of medial plantar nerve at risk with medial plantar approach to tibial sesamoid

Question 2

what does the lateral planter nerve supply?

Answer 2

• innervates everything else
• Adductor hallucis
• Quadratus planatae
• All interossei
• lateal 2 lumbricals
• adductor digiti minimi via BAXTER’s nerve- 1st branch of LPN

Question 3

What would the physical exam be like of a pt with a plantar nerve injury?

Answer 3

• Weak or absent MTP flexion (intrinsic minus)

Question 4

what does the sural nerve supply?

Answer 4

• Branch of tibial nerve
• runs distal with the small saphenous vein
• anastomoses with a branch from the peroneal nerve
• continues distal on lateral aspect of the Achilles tendon
• terminates as the lateral dorsal cutaneous nerve of the foot
• supplies lateral aspect of foot and posteriolat calf

Question 5

What does the deep peroneal nerve supply?

Answer 5

• Tibialis anterior
• Peroneus tertius
• Extensor Hallucis brevis
• Extensor Hallucis longus
• terminal branch to extensor hallucis brevis extensor digitorium brevis

sensation= 1st dorsal webspace

derived from common peroneal nerves L4-5

Question 6

What does the superificial peroneal neve innervate?

Answer 6

• Peroneus longus
• Peroneus brevis
• sensation- majority skin dorsum foot and midway up anterolateral shin
• terminal branch of common peroneal nL4-S1
• terminal branches
  
  • medial branch- dorsimedial hallux
    
    • vunerable at bunion surgery
  • lateral cutaneous branch
    
    • ​emerges 12-15 cm prox tip of lateral malleolus
    • vunerable with arthroscopic portal
    • ORIF distal fibular