← Back to Session

Time Completed: 01:08:33

Final Score 46%

83
97

Questions

  • Q1. Correct
  • Q2. X Incorrect
  • Q3. Correct
  • Q4. Correct
  • Q5. X Incorrect
  • Q6. Correct
  • Q7. X Incorrect
  • Q8. Correct
  • Q9. X Incorrect
  • Q10. Correct
  • Q11. Correct
  • Q12. Correct
  • Q13. Correct
  • Q14. Correct
  • Q15. X Incorrect
  • Q16. X Incorrect
  • Q17. Correct
  • Q18. X Incorrect
  • Q19. Correct
  • Q20. X Incorrect
  • Q21. X Incorrect
  • Q22. Correct
  • Q23. Correct
  • Q24. X Incorrect
  • Q25. Correct
  • Q26. Correct
  • Q27. Correct
  • Q28. X Incorrect
  • Q29. X Incorrect
  • Q30. X Incorrect
  • Q31. Correct
  • Q32. X Incorrect
  • Q33. X Incorrect
  • Q34. Correct
  • Q35. X Incorrect
  • Q36. X Incorrect
  • Q37. Correct
  • Q38. X Incorrect
  • Q39. X Incorrect
  • Q40. X Incorrect
  • Q41. Correct
  • Q42. X Incorrect
  • Q43. Correct
  • Q44. X Incorrect
  • Q45. Correct
  • Q46. X Incorrect
  • Q47. X Incorrect
  • Q48. X Incorrect
  • Q49. X Incorrect
  • Q50. Correct
  • Q51. Correct
  • Q52. Correct
  • Q53. Correct
  • Q54. Correct
  • Q55. X Incorrect
  • Q56. Correct
  • Q57. Correct
  • Q58. X Incorrect
  • Q59. Correct
  • Q60. Correct
  • Q61. X Incorrect
  • Q62. X Incorrect
  • Q63. X Incorrect
  • Q64. X Incorrect
  • Q65. X Incorrect
  • Q66. X Incorrect
  • Q67. Correct
  • Q68. X Incorrect
  • Q69. Correct
  • Q70. X Incorrect
  • Q71. Correct
  • Q72. Correct
  • Q73. X Incorrect
  • Q74. Correct
  • Q75. X Incorrect
  • Q76. X Incorrect
  • Q77. Correct
  • Q78. Correct
  • Q79. X Incorrect
  • Q80. X Incorrect
  • Q81. Correct
  • Q82. X Incorrect
  • Q83. X Incorrect
  • Q84. Correct
  • Q85. X Incorrect
  • Q86. X Incorrect
  • Q87. Correct
  • Q88. X Incorrect
  • Q89. Correct
  • Q90. Correct
  • Q91. X Incorrect
  • Q92. Correct
  • Q93. X Incorrect
  • Q94. X Incorrect
  • Q95. X Incorrect
  • Q96. Correct
  • Q97. X Incorrect
  • Q98. Correct
  • Q99. X Incorrect
  • Q100. Correct
  • Q101. X Incorrect
  • Q102. Correct
  • Q103. X Incorrect
  • Q104. X Incorrect
  • Q105. X Incorrect
  • Q106. X Incorrect
  • Q107. Correct
  • Q108. X Incorrect
  • Q109. Correct
  • Q110. X Incorrect
  • Q111. X Incorrect
  • Q112. Correct
  • Q113. X Incorrect
  • Q114. Correct
  • Q115. Correct
  • Q116. Correct
  • Q117. X Incorrect
  • Q118. Correct
  • Q119. X Incorrect
  • Q120. Correct
  • Q121. Correct
  • Q122. Correct
  • Q123. Correct
  • Q124. Correct
  • Q125. X Incorrect
  • Q126. Correct
  • Q127. X Incorrect
  • Q128. X Incorrect
  • Q129. Correct
  • Q130. Correct
  • Q131. X Incorrect
  • Q132. X Incorrect
  • Q133. X Incorrect
  • Q134. X Incorrect
  • Q135. X Incorrect
  • Q136. Correct
  • Q137. Correct
  • Q138. X Incorrect
  • Q139. X Incorrect
  • Q140. Correct
  • Q141. Correct
  • Q142. X Incorrect
  • Q143. Correct
  • Q144. X Incorrect
  • Q145. X Incorrect
  • Q146. X Incorrect
  • Q147. X Incorrect
  • Q148. X Incorrect
  • Q149. X Incorrect
  • Q150. Correct
  • Q151. X Incorrect
  • Q152. X Incorrect
  • Q153. Correct
  • Q154. X Incorrect
  • Q155. X Incorrect
  • Q156. X Incorrect
  • Q157. Correct
  • Q158. Correct
  • Q159. X Incorrect
  • Q160. X Incorrect
  • Q161. Correct
  • Q162. X Incorrect
  • Q163. X Incorrect
  • Q164. Correct
  • Q165. X Incorrect
  • Q166. X Incorrect
  • Q167. Correct
  • Q168. Correct
  • Q169. X Incorrect
  • Q170. X Incorrect
  • Q171. Correct
  • Q172. Correct
  • Q173. Correct
  • Q174. X Incorrect
  • Q175. Correct
  • Q176. Correct
  • Q177. Correct
  • Q178. X Incorrect
  • Q179. X Incorrect
  • Q180. X Incorrect

Anatomy

Lower Limb

Question 16 of 180

The common fibular nerve directly supplies which of the following areas of skin:

Answer:

The lateral sural cutaneous branch of the common fibular nerve supplies skin over the upper lateral leg.

The common fibular nerve, also known as the common peroneal nerve, is a branch of the sciatic nerve receiving fibres from L4 - S2.

Table: Anatomical Overview of the Common Fibular Nerve

Nerve Common Fibular
Nerve roots L4 – S2
Motor supply Directly: Short head of the biceps femoris

Terminal Branches: All muscles in the anterior and lateral compartments of the leg, all intrinsic dorsal foot muscles

Sensory supply Directly: Skin over the upper lateral leg

Terminal Branches: Skin over the lateral aspect of the lower leg and ankle, and dorsal aspect of the foot and toes (except for the lateral side of little toe)

Injury Motor Loss: Loss of dorsiflexion of ankle and foot eversion, weakness of foot inversion, loss of toe extension, foot drop with high-stepping gait and loss of sensation in above distribution

Sensory Loss: Loss of sensation in skin over the lateral aspect of leg and ankle, and dorsal aspect of the foot and toes (except for the lateral side of little toe)

Anatomical Course

The nerve arises at the apex of the popliteal fossa and follows the medial margin of the biceps femoris tendon over the lateral head of the gastrocnemius muscle. Here it gives rise to two cutaneous branches, the sural communicating nerve which joins the sural nerve (branch of the tibial nerve), and the lateral sural cutaneous nerve (supplying skin over the upper lateral leg).

The common fibular nerve continues by wrapping around the neck of the fibula and passing between the attachments of the fibularis longus muscle to enter the lateral compartment of the leg where it divides into its terminal branches, the superficial and deep fibular nerves.

By Henry Vandyke Carter [Public domain], via Wikimedia Commons

Common Fibular Nerve. (Image by Henry Vandyke Carter [Public domain], via Wikimedia Commons)

Branches

Table: Branches of the Common Fibular Nerve

Branch Supply
Muscular branch Short head of biceps femoris muscle
Sural communicating nerve Joins sural nerve
Lateral sural cutaneous nerve Skin over upper lateral leg
Superficial fibular nerve Lateral compartment of leg and skin over lower anterolateral leg, and dorsum of foot (except lateral side of little toe and skin over webspace of 1st and 2nd toe)
Deep fibular nerve Anterior compartment of leg and skin over webspace between 1st and 2nd toes

Function

The common fibular nerve directly innervates the short head of the biceps femoris muscle and supplies skin over the upper lateral leg via its lateral sural cutaneous branch.

Through its terminal branches, the common fibular nerve innervates all of the muscles in the anterior and lateral compartments of the leg and the dorsal intrinsic foot muscles and skin over the anterolateral aspect of the lower leg and the dorsal aspect of the foot and toes (except for the lateral side of the little toe, supplied by the sural branch of the tibial nerve).

Table: Motor Supply of the Common Fibular Nerve

Muscle Function Branch
Tibialis anterior Dorsiflexion and inversion of foot, support of medial arch of foot Deep fibular nerve
Extensor hallucis longus Extension of great toe and dorsiflexion of foot Deep fibular nerve
Extensor digitorum longus Extension of lateral four toes and dorsiflexion of foot Deep fibular nerve
Fibularis tertius Dorsiflexion and eversion of foot Deep fibular nerve
Fibularis longus Plantarflexion and eversion of foot, support of lateral and transverse arch Superficial fibular nerve
Fibularis brevis Eversion of foot Superficial fibular nerve

Modified by FRCEM Success. Original by Henry Vandyke Carter [Public domain], via Wikimedia Commons

Cutaneous Innervation of Lower Limb. (Image modified by FRCEM Success. Original by Henry Vandyke Carter [Public domain], via Wikimedia Commons)

Report A Problem

Is there something wrong with this question? Let us know and we’ll fix it as soon as possible.

Loading Form...

Close
  • Biochemistry
  • Blood Gases
  • Haematology
Biochemistry Normal Value
Sodium 135 – 145 mmol/l
Potassium 3.0 – 4.5 mmol/l
Urea 2.5 – 7.5 mmol/l
Glucose 3.5 – 5.0 mmol/l
Creatinine 35 – 135 μmol/l
Alanine Aminotransferase (ALT) 5 – 35 U/l
Gamma-glutamyl Transferase (GGT) < 65 U/l
Alkaline Phosphatase (ALP) 30 – 135 U/l
Aspartate Aminotransferase (AST) < 40 U/l
Total Protein 60 – 80 g/l
Albumin 35 – 50 g/l
Globulin 2.4 – 3.5 g/dl
Amylase < 70 U/l
Total Bilirubin 3 – 17 μmol/l
Calcium 2.1 – 2.5 mmol/l
Chloride 95 – 105 mmol/l
Phosphate 0.8 – 1.4 mmol/l
Haematology Normal Value
Haemoglobin 11.5 – 16.6 g/dl
White Blood Cells 4.0 – 11.0 x 109/l
Platelets 150 – 450 x 109/l
MCV 80 – 96 fl
MCHC 32 – 36 g/dl
Neutrophils 2.0 – 7.5 x 109/l
Lymphocytes 1.5 – 4.0 x 109/l
Monocytes 0.3 – 1.0 x 109/l
Eosinophils 0.1 – 0.5 x 109/l
Basophils < 0.2 x 109/l
Reticulocytes < 2%
Haematocrit 0.35 – 0.49
Red Cell Distribution Width 11 – 15%
Blood Gases Normal Value
pH 7.35 – 7.45
pO2 11 – 14 kPa
pCO2 4.5 – 6.0 kPa
Base Excess -2 – +2 mmol/l
Bicarbonate 24 – 30 mmol/l
Lactate < 2 mmol/l

Join our Newsletter

Stay updated with free revision resources and exclusive discounts

©2017 - 2024 MRCEM Success